How to care for aluminum detection tool

In Aluminum Alloys production, measurement tools for inspectors as their weapons . If the weapon is semi-paralyzed or damage to state that the test results would not make any sense , but there is no supervision of product quality control role . Therefore, measuring the maintenance and care is very important. Here are a few measurement tool maintenance specifications ( for commonly used detection tool ) :

1 Measuring exhausted after , to clean surface stains , aluminum scrap , loosen the fastening device, when the long-term ( one month or more ) when not in the measurement surface to be oiled . Gage when not , to put it in a protective case , it is best to use someone full-time , and do measuring unit testing by the authoritative annual record.

(2) Do not use the caliper jaws as the stylus tip , compasses , or other tools, are not allowed to artificially twist two jaws or to gauge when the card board uses .

3 Do not oil stone , emery cloth and rub the surface of measuring surface and measuring reticle part non- metering maintenance personnel , non- demolition , alteration and unauthorized repairs gauges.

4 Do not touch the gage measuring surface , because the hands have sweat and other dirt can contaminate the measuring surface , making it rust. Measuring do with other tools , and metal substances mixed together so as not to bruise measuring tools.

5 gage storage place should be kept clean , dry, no vibration, no corrosive gas , and to stay away from a large range of temperature change place or places where magnetic fields . Storage box measuring gages to clean and dry, are not allowed to store other debris.

6, when the surface has burrs , must go to the net burr , and then measure , or make measuring wear , and will affect the measurement accuracy of the results .

Aluminum alloy plating process

Aluminum and Aluminum Alloys by the addition of various alloy elements will be present in several different forms in the aluminum alloy . Example: in the form of solid solution into the aluminum character ; in the element itself or in the form of microscopic particles of aluminum or other alloying elements of the intermetallic compound in the form of particles in the aluminum alloy . Therefore, to find a different universal aluminum pretreatment and pre-plating process , the forks with the same satisfactory results are very difficult to teach . In the plating process , we learn from the steel parts repair plating process . Namely:

Cathodic degreasing → ??washing → washing technique anode activation → → washing → → pre- tinned copper

Activation with removal step can produce a thin oxide film thickness of the oxide film on a solid removed by use machine maple .

Aluminum is a reactive metal in the air easily oxidized , coated each step interval should be as short as possible . And kept moist , never dry spots formed . Once the formation of dry spots , it means that the surface re- oxidized, reduced junction platform strength coating the activated surface after washing and order as soon as possible with the remaining complex , preventing in -process workpiece surface is re- oxidation.

Although the plating process according to the above process operation. Of industrial pure aluminum and aluminum- manganese alloy forging is ideal, but the aluminum- magnesium , aluminum- magnesium, silicon , magnesium, aluminum -zinc alloy in the production of still occur due to junction station and force bad batch rework loop resistance elevated . After many trials attack , we improved the activation solution composition used in the activation of dilute hydrochloric acid instead of sulfuric acid , preferably the best value , improved aluminum magnesium alloy for plating a junction station force .

Ancient volume on high silicon cast alloy , fork right amount added HF, although a trace amount added , but the effect is very obvious.

Meanwhile, after Wei -phase detection cartridge tin layer , we believe that the production process caused loop resistance is too high and causes peeling thickness with pre-plating , the current size is closely related to the degree eagle . This also includes the brush plating current density . Mo brush transition with alkaline copper plating solution , plating repeated too thick. Easily cause great stress coating . Causing peeling. Current density is too too , brush plating layer , layer particle technetium big sister , grain and grain together appear crosslinked network structure transition chain ring loose micro display is not dense , and the substrate junction station is weak , it brush or causes blistering hot baking tin after blistering after the invasion when corrosive gases , exacerbating the region corrosion and ultimately lead to increased loop resistance tin layer peeling off.

After several experimented , we use the following brush tin process:

( 1 ) Brush the surface with water sandpaper carefully polished , Chen lost oxide.

( 2 ) cathodic degreasing , 12 ~ 15V5 ~ 15s, to the workpiece surface is not hanging drops, washed clean .

( 3 ) anode activation, do not ask the appropriate material selection activation solution , the voltage l5V around , 8 ~ 12s, to the surface dark gray, washed with alkaline copper plating solution without electricity wipe the surface .

( 4 ) pre- plating copper . Voltage of about 10V , l ~ 2min, washed clean .

( 5 ) Brush tin , 8 ~ 12V, power consumption is calculated by time .

According to the above process operation. Junction station to check the strength , thermal shock test according to GB5270 do . Oven heating the part to a person 150 ± 10. C, time was 2h, after removing the parts into the chilling tank , found that the coating and substrate junction station well, no blistering and peeling of the test loop resistance from the assembly plant type test group testing, electrical connectors T- , L -Block , etc. contact resistance are maintained at l5 ~ 25m '~, breaks the electrical contact elements Taipower performance standards .

Aluminum screen frame product application

An electronic aluminum frame : suitable for single -sided printed circuit boards, decals, glass, printing and other printing precision require manufacturers to use : semi-automatic screen printing presses operating mainly in the main part of the material is also suitable for manual printing .

2 treadmill printing aluminum frame : suitable treadmill printing, apparel printing , gifts , leather, plastic , glass products and toys printing manufacturers use ; printing jobs mainly for manual -type lines ( running machine ) operations.

3.CD, ceramic Aluminum Alloys frame : suitable for CD player, signs nameplate , Epoxy , keyboard , plastic, shell, etc. require manufacturers to use ordinary printing precision : print jobs to a small area of ??hand printing and printing machines based ; single frame can be customized and curved frames and other special-shaped box.

4 Precision Electronics aluminum frame : suitable for multi-layer circuit boards, LCD , SMT, membrane switch, ceramic decal , tobacco packaging printing manufacturers use high precision requirements : Printing jobs mainly in automatic screen printing machine-based , some are also suitable for precision semi-automatic screen printing presses.

5 large aluminum frame: suitable for large-scale outdoor four -color advertising, light printing, automotive glass, glass curtain wall and other large-format printers used to print large format screen printing work is mainly based.

Aluminum plant equipment operation and maintenance rules

From the law of that Aluminum Alloys equipment wear, normal wear the longer the better use of equipment. In other words, to make the use of equipment in use on the best, we must ensure that normal wear and tear of equipment equal to the natural life. Thus, we can draw such a basic concept, that is, the device is put into production after use, I hope it is in use of the available time better.

Device performance level of availability of time is determined by the equipment downtime. To achieve this goal, various factors involved, it is the device itself, in addition to the quality of the composition (including performance reliability and durability, the structure is reasonable, the selection of advanced, reasonable, processing, manufacturing quality assurance, etc.) is the basic condition, the use of the correct, rational use, well maintenance, careful management, the objective is to extend the life of equipment requirements, give full play equipment effectiveness, improve the basic conditions for the time availability . Equipment downtime, the more work, the less time available, the time may be lower utilization; Conversely, time availability is higher.

Our vision is to require device can rate one hundred percent of the time. Practical work countless examples show that the same model, same manufacturer in the same period production equipment used in the same environmental conditions, because the conditions of use and maintenance pros and cons, effects a great disparity. This situation not only between two devices, even in the same piece of equipment will vary depending on the operational use of the use of personnel, maintenance level differences, the use effect is not the same.

Characteristics and mechanical properties of aluminum alloy 2A14

The composition and properties from the point of view 2A14 it is hard alloy wrought Aluminum Alloys can also fall 2A50, 2A50 it differs in that the copper content is high, so high strength, heat resistance is good, but the hot state under the plastic as well 2A50 alloy has good machinability, electrical resistivity. performance is good spot and seam welding, arc welding and gas welding performance is poor; can be heat strengthened, with squeeze effect; Therefore, vertical transverse performance has differences; corrosion resistance is not high, but in the state of artificial aging tendency to intergranular corrosion and stress corrosion cracking tendencies.

Mechanical properties:

Tensile strength σb (MPa): ≥ 440

Elongation δ5 (%): ≥ 10

Note: The mechanical properties of longitudinal bars at room temperature

Sample Size: bar diameter (square bar, hexagonal bar inscribed circle diameter) ≤ 22

Heat treatment specifications:

A) homogenizing annealing: heating 475 ~ 490 ℃; insulation 12 ~ 14h; furnace cooling.

2) complete annealing: heating 350 ~ 400 ℃; with the effective thickness different, holding time 30 ~ 120min; to 30 ~ 50 ℃ / h speed with furnace cooling to 300 ℃, and then cooled.

3) rapid thermal annealing: heating 350 ~ 460 ℃; holding time 30 ~ 120min; air cooling.

4) quenching and aging: quenching 495 ~ 505 ℃, water; natural aging at room temperature for 96h.

Select aluminum skid plate method

A look at the use of materials, quality of aluminum used in aluminum skid plate, thickness, strength and oxidation film, should conform to the relevant standards, the wall thickness should be 1.2 mm or more, tensile strength of 157 Newtons per square millimeter , yield strength to 108 Newton per square millimeter, the oxide film thickness of 10 microns. If you can not reach the above criteria, is inferior aluminum windows and doors, can not be used.

Second look processing, high-quality aluminum alloy skid plate, fine processing, mounting stress, good sealing performance, switch freely. Poor quality aluminum windows and doors, aluminum blind selection series and specifications, processing shoddy, to replace the sawing and milling machining is not required for installation, sealing performance is poor, the switch does not freely, not only leaks and the emergence of glass burst leakage phenomenon, and the case to strong winds and external, easy to pull off some or glass blowing or touching down, destroy property wounding.

Third, look at the price, under normal circumstances, high-quality aluminum alloy skid plate due to high production costs, cheaper than inferior aluminum skid plate to be about 30% higher. Currently self-employed processing aluminum skid plate more, they do not know the structural characteristics of Aluminum Alloys skid plate and its properties. In order to reduce the cost of cutting corners, shoddy products hidden larger, generally should not be used. The best selection of regular aluminum skid plate manufacturer of the product.

Mastic awareness and understanding of complex aluminum

Aluminum alloy and polymer composite insulating material is a combination of new windows, doors and curtain wall building materials. Through this combination of aluminum profiles form a central insulating interlayer, thus achieving "insulated aluminum" purposes. Insulated aluminum composite bridge mainly wear strip with mastic two types.

Mastic composite Aluminum Plates heat energy technology originated in the United States, in general, these techniques are the polymers and aluminum mixed. Companies on behalf of the United States Eliasson type composite aluminum casting technology, by pouring the bridge molded polyurethane insulation inside and outside the two-part aluminum bonding formed into a whole in order to achieve energy-saving purposes. Its performance, technology, cost and so very satisfactory. From the late 1930s, with the widespread use of aluminum doors and windows, some of the innovative American designers began to consider the aluminum door and window insulation is poor, so as to effectively solve the aluminum energy-saving technologies.

Aluminum colored conductive oxidation process

The conductivity of aluminum and aluminum oxidation process , the oxide film obtained is still excellent conductive properties , which is its unique properties, and protective and decorative coating performance is also very good, color matching aluminum surface layer zinc layer iridescent passivation film is more elegant , with a light and uniform color appearance of fine lines , is very promising and worthy craft.

Aluminum and aluminum conducting oxidation process is simple , no special equipment , in recent years, the conductive oxide film easily adsorbed organic coating , good adhesion can be further improved understanding , and thus as a coating ( electrophoresis , painting ) application of the substrate has also been gradually expanded.

Pretreatment process details to note in the aluminum material in the air is very unstable , easily formed with the naked eye is difficult to identify the oxide film. Since aluminum processing different methods, such as casting , or by a direct extension pressure plate cut from , or mechanical fine molding , or by different molding process after heat treatment or welding , the surface will be presented different states , different levels of dirt or traces , for the pretreatment step to the surface of the workpiece on the actual situation of the process for pre-treatment .
( 1 ) Aluminum Alloys and aluminum precision machining parts pretreatment process issues that need attention : precision machining parts although the surface of the natural oxide film Caichu generation, easy to remove , but greasy heavy, especially in and around the hole ( lubrication due to the machining process need to add ) , this kind of work must be approved by an organic solvent cleaning , if the direct use of caustic not only difficult Ex greasy heavy and fine processing of surfaces can not afford a long period of alkali corrosion , the results will be affect the workpiece surface with roughness and tolerances , may eventually become waste.

( 2 ) aluminum alloy and aluminum casting parts in the pretreatment step problems that need attention . Not all pieces of casting surfaces are machined , machined surfaces without leaving formed during casting too thick oxide layer , and some interbedded with sand , then you should use the first method of machining or sandblasting to remove this part of the original oxide film , or by caustic after processing, the only way to both Ex unprocessed parts of the original oxide layer, and avoid machined parts tolerances change.

( 3 ) heat-treated aluminum alloy and aluminum welding workpieces or previous treatment process issues that need attention : pendulum cesium process requirements , the workpiece into the heat treatment or welding processes required by the organic solvent prior to cleaning, in addition to the net surface oil, but it is generally not do this , so the workpiece surface to form a sintered layer of oil coke material , this layer of coke in organic solvents is difficult in addition to the net , if soaked in lye can cause localized corrosion , pitting or cause arising uneven , seriously affecting the quality of products.

Aluminum windows and doors of the six indicators of material

Progress of the times , many people have begun to focus on quality of life, ease and comfort of home environment has become more concerned about the field , so in recent years , aluminum doors and windows has been favorable for consumers , almost anywhere in life you can see to its presence , today Xiaobian to continue to spread information on the six indicators of material aluminum windows and doors .

1 , Thickness: aluminum sliding doors , 70 series, 90 series are two residential interior aluminum sliding doors with 70 series can be. Series number indicates the thickness of the door frame structure dimensions in millimeters . Aluminum sliding windows , 55 series, 60 series, 70 series , 90 series of four. Series selection should be based on the size and the local wind pressure or windows depending on the value . As a closed veranda aluminum sliding windows should not be less than 70 series.

2 , Strength : Tensile strength should reach 157 Newtons per square millimeter , the yield strength to reach 108 Newtons per square millimeter . When you purchase , you can hand moderately curved profiles, let go after the state should be able to recover .

3 , color : Aluminum Alloys with a color should be the same, such as color obviously , that should not be optional .

4 , flatness : Check the aluminum alloy surface , there should be no dents or bulges .

5 , gloss : aluminum windows and doors opening to avoid bubbles optional surface ( white dots ) and ash ( black spots ) , as well as cracks, burrs , peeling and other obvious defects profiles.

6, the oxidation degree : an oxide film thickness of 10 microns. When you purchase may be scratching the surface of the profile look to see whether the surface of the oxide film can be erased .

Heat-treated aluminum profiles online technical parameters

Aluminum Alloys extrusion die to leave through three stages, namely close to quenching, quenching and cooling to ambient temperature after quenching , in order to prevent undesired precipitation of a second phase , is about to enter the cooling device profiles (quenching zone) the temperature must be in the above solvus temperature . The cooling rate of the cooling device and the cooling contact time should be sufficient to obtain the desired components of a supersaturated solid solution , the final properties of the product meets the requirements . Requirements extrusion die to quench zone distance should be as small as possible , ie to try to quench transfer time shorter .

Extrusion line can be quenched alloy has the following features :

( 1 ) having a structural applications in accordance with the tensile strength properties ;

( 2 ) low quench sensitivity , can be a variety of different products using forced air cooling section without using water quenching ;

( 3 ) alloy solid solution between the line and the solidus temperature range, easy to control the outlet temperature of the desired products, the solution temperature range ;

( 4 ) use air cooling material has sufficient toughness ;

( 5 ) extruding the solution temperature at the low deformation resistance , to minimize the deformation energy and synthesis temperature , allowing to obtain a higher extrusion speed

Aluminum features, applications and sources

Aluminum is a silvery white light metal , a very wide range of applications , known as the second metal , its production and consumption is second only to iron and steel . Bo is the density of aluminum 2 .7 × 103kg / m3, about steel l / 3. When the cross-sectional area and length are the same, the conductivity of copper aluminum 64 %, if calculated by mass , its conductivity is 200% copper , good thermal conductivity . As can be formed on the surface of a solid layer of thin aluminum oxide film , can prevent further oxidation , therefore , the aluminum in the atmosphere , water and some corrosive medium high corrosion resistance . Aluminum, plastic, easy to withstand pressure processing, can be drawn into filaments or pressed into thin slices ; while being able to make it through the cold and hardened alloy .

Aluminum is characterized by a low density , high specific strength (strength to density ratio ) , but also has good ductility and corrosion resistance. In addition, most of the aluminum alloy can be enhanced to the heat treatment method . According to their composition and production process, aluminum can be divided into deformable aluminum and cast Aluminum Alloys . Which can be wrought aluminum alloy hot rolled , cold rolled , stamping , extrusion , bending, curling and other mechanical processing, so a wider use . Rust-proof aluminum alloy can be divided into (A1-Mn and Al-Mg based alloy ) , hard alloy (Al-Mg-si and Al? Cu-Mg alloy ) , hard aluminum (A1-Zn-Mg-cu alloy ) , wrought aluminum (Al-Mg-si-cu -based alloys) .

Aluminum and aluminum alloys , mainly used in the construction industry , the production of windows and doors , partitions , ceiling, and outdoor decoration ; in the aerospace and defense industry sectors are also widely used aluminum alloys, manufacture of aircraft , ships , guns , etc. ; in power transmission , commonly used high strength steel wire reinforced aluminum cables for overhead lines ; addition , automobile manufacturing, container transport, daily necessities , household appliances , machinery and equipment and other fields have extensive use of aluminum and aluminum alloys .

With the production, consumption increases, the amount of waste aluminum products is also growing , and many are single-use aluminum products , products made to the product from the loss of use value is shorter, and therefore its disposal miscellaneous materials into the source of contamination . Meanwhile, aluminum and aluminum alloy is a kind of high environmental load materials , production requires a lot of power , therefore, how to make the best recycling of scrap materials, both the economic development needs, but also environmental protection requirements.

Miscellaneous scrap material stems from its wide range of applications . Differs in its use led to its composition, properties are quite different to the scrap material recycling and reuse create great difficulties . In order to cost less exhausted recycled aluminum , and to ensure the quality of recycled aluminum can continue to meet a variety of needs , the classification of scrap for recycling is very important. If you do not classify cleaning , screening and blind remelting , recycled product is not working, there may even become garbage again . To this end, the advanced industrial countries have developed a corresponding scrap standards or professional standards. For example, Japan's National Institute of Standards JIS (H119) based on aluminum scrap alloy type , recency , shape, divided into 28 kinds of sources , and the secondary alloy manufacturing processes and quality assessment have corresponding regulations.

Simple test anodic oxide film 5 Ways

The quality of the oxide film can be detected by the following method ;

1 View of colors. Generated surface oxide film is a milky white Aluminum Alloys , cast aluminum , miscellaneous aluminum grayish black . Did not generate the surface oxide film was transparent bright white , some black or gray with pink hanging cream.

2 The measured resistance . Generated when the detection of the oxide film resistor , pressure not conductive. The oxide film is not generated when a detection conductor .

3 scratches the surface of the oxide film has generated very hard, when you draw with a needle slipping, no scratches, the surface of the oxide film is not generated very soft, with a needle and scratch resistance when planning .

4 Listen to the sound of banging oxide film has been generated will be issued when the crisp sound, the oxide film is not generated when issuing muffled beat

5 coloration test. Oxide film has been generated in the dye solution soon be colored oxide film is not generated in the dye solution dyed not color

Aluminum temperature setting and control technology

1, aluminum temperature setting and control: usually, warm temperatures with the table there were some errors when setting the table according to the furnace temperature and the actual temperature to be set, and pay close attention to temperature fluctuations.

2, aluminum heat aging: in strict accordance with requirements of the aging process, the holding time should be appropriate to prevent the over-aged and under-aged or cause insufficient hardness. Blank framed, mounted stove

3, aluminum extrusion framed not too close, to have spacing between the material and the material, especially the non-ventilated Aluminum Alloys small material, thick material to be bigger interval more, tubing and small material, sheet combined installed a box, aluminum tubing placed beneath it is a good time-circulating air.

4, aluminum furnace installed to 6xxx alloys and other special furnace installed separately from normal aging 6063, due to production reasons you really want the same heat aging, it is necessary to have access to special alloy subjected to aging process.

Out of aluminum extrusion, without low hardness before aging, not as a finished product to use, so, in general, must be to improve strength after aging. Typically, aging can be divided into two kinds of natural aging and artificial aging, aluminum 6xxx aluminum production now or in the future basically dominated.

Ultra-fine aluminum silicate used in the coating of the benefits

Replace part of superfine aluminum Titanium dioxide is widely used in the paint industry at home and abroad technology has obvious economic benefits. Here for you to explain ultrafine aluminum silicate in the coating played some role:

1, to improve the whiteness of paint.

Ultrafine titanium silicate replace part of, not only does not change the titanium dioxide dry hiding power, but also improve the whiteness of paint. If the same amount of titanium dioxide, which will significantly improve the dry hiding power and whiteness large amplitude will increase.

2, the role of a buffer PH value.

PH value range of ultra-fine Aluminum Alloys silicate 9.7-10.8, with PH value buffer. In particular, vinyl acetate latex storage process, to prevent the hydrolysis of vinyl acetate leaving the PH value decreased, thus increasing the dispersion stability of the paint, while avoiding the inner wall of the metal container to corrode.

3, the paint has a good suspension.

Ultra-fine aluminum silicate, the grid structure makes the paint system is slightly thickened, with good suspension, and prevent solids sink to the bottom and surface water separation phenomenon.

4, enhanced paint scrub resistance, weather resistance.

Ultrafine aluminum silicate paint film that has a good scrub resistance, weather resistance, but also shorten dry time.

5, with a matting effect.

Ultra-fine aluminum with matting effect, so the semi-gloss, matt paint may be used as a matting agent economy, should not be used in the light paints.

How to identify the quality of solar aluminum type

1, identity checks: Solar aluminum and packaging products are marked with the standard code and production license number, etc.;

2, the surface quality: In addition to the solar aluminum surface should be clean, does not allow cracks, peeling, corrosion and bubbles and other defects exist, but also does not allow corrosion spots, electrical burns, dark spots, shedding oxide film defects such as;

3, the oxide film thickness: Solar Aluminum Alloys oxide film is formed by anodic oxidation, a protective and decorative effect, can be used to detect eddy current thickness;

4, the sealing quality: on-site inspection in general by acid leaching, poor sealing will leave visible traces of solar aluminum, traces of heavier Description sealing quality worse;

5, the corrosion resistance: can be alkali drop test, was visually observed until the droplet at corrosion bubbling oxide film is calculated through time, this test easily outdoors in the summer coarse synchronization judgment, in order to ensure the test Accuracy in the laboratory must be carried out under stringent conditions require.

Aluminum and aluminum alloy electroplating pretreatment process improvement

Aluminum and aluminum alloy metal plating surface , the surface can significantly improve their physical or chemical properties , made ​​of aluminum and aluminum alloy conductor, silver plating on its surface to increase the surface conductivity or electrical contact parts ; as the aluminum easy welding, plating on the surface of copper, nickel or tin ; order to improve its wear resistance , plating thickness on the surface of Ge . In the decorative aspect , in fact, mostly plating Ge .

Aluminum and Aluminum Alloys surface plating , a long time ago and have been trying for the actual production . However, the coating of aluminum and aluminum alloys and between the oxide , aluminum and aluminum and the metal plating layer different thermal expansion coefficients , and the residual coating with pinholes and other factors plating solution , resulting in poor coating adhesion , prolonged use may peel off even in the plating immediately after peeling , in the field of surface treatment of aluminum and aluminum alloy plating process is still in the exploratory stage, has long been no substantive breakthrough , has not formed a complete and mature technology . Coating adhesion is not strong aluminum and aluminum alloy plating quality and product qualification rate is still the industry bottlenecks.

Two traditional aluminum and aluminum plating

Aluminum and aluminum electrolysis in the electrolyte can form a coating, but the coating adhesion is not strong , easy to peel . Therefore, the first aluminum oxide compound in an aqueous solution containing zinc plating then electroplating deposition , this method both for zinc substitution method or a deposition method . But also the first in the surface treatment of aluminum and aluminum alloy obtained by anodic oxidation power thin layer of porous oxide film during plating.

2.1 Conventional aluminum and aluminum alloy electroplating process

Aluminum and aluminum alloy electroplating process have pre-plating treatment, plating , after plating processing three parts. Pre-treatment is related to the merits of the product quality plating of the most critical processes , its main purpose is to remove the aluminum and aluminum alloy surface oils , naturally formed oxide film and other contaminants .

Conventional general process: degreasing - washing - Less eclipse - washing - pickling - washing - Activation - washing - a dip zinc - washing - retired Zinc - washing - Secondary dip zinc - washing - Neutral Nickel - washing - subsequent plating.

There is also replaced the wave anodic oxide film during the subsequent post- dip zinc plating process .

2.2 conventional pre-treatment process deficiencies

1 long process , process more .

2 complex process, a narrow operating range , the process parameters must be strictly controlled .

3 . Process scope is not wide , different grades of aluminum pre-treatment process can not be identical, adjustments must be based on grade aluminum pre-treatment process .

4 In the strict control of pre-treatment process under the premise of electroplating products pass rate is very low, ordinary decorative plating passing rates of 85% to 90% , functional electroplating pass rate of 60% to 70%.

5 The pot life of each process solution is short, the processing cycle is short.

Since conventional pre-treatment of aluminum and aluminum agree more widespread lack , therefore, must be improved .

Three . Improved Universal aluminum and aluminum plating pre-treatment process

Degreasing alkaline etching combo - washing - pickling - washing - go gray - washing - alkali activation - dip zinc - washing - Neutral Nickel - washing - up plating.

Four . Practice summary

New processes for the current actual defects aluminum plating , combined with aluminum to teach their special physical and chemical properties, in the original process improvement on the basis of the specific advantages:

1 short process, through selective dissolution of the surface layer of aluminum and other metals to improve the purity of aluminum alloy surface , coating adhesion is improved .

(2) was first activated with alkaline acidic activation process to completely replace the clearance rate of alloy plating pre-treatment process of surface residual silicon and silicone, effectively improve coating adhesion .

3 alkaline activated zinc dipping directly without washing , to avoid acidic activation after washing and then the second dip zinc exposure in air to form an oxide layer .

4 Just a simple dip zinc can, significantly better than the secondary coating adhesion complex, multi -dip zinc and zinc cyanide leaching process .

5 . Process wide versatility , almost all grades of aluminum used in the plating pre-treatment.

6 products plating time pass rate was significantly higher than the traditional process . If a simple coating adhesion quality assessment, the product qualification rate of close to 100%.

7 actual production process is simple and convenient.

8 automatic production line for a long time scale gantry actual production proved , the improved new aluminum plating pre-treatment is very stable .

9 easy in the traditional aluminum plating process on the basis of process improvement .

10 Using power -ho into aluminum oxide can be achieved quickly improve the film speed, shorten the film on time, save resources, to achieve the effect of cost savings .

Model and the deposition rate of aluminum between

The pros and cons of aluminum components can be distinguished in the alkaline etching time, if the workpiece surface after alkaline etching there is too much gray and black films, or red film, then this section is necessarily high silicon aluminum or copper, for The chemical conversion of aluminum alloys forming time in relation to shorten, or received a conductive film is bound to be difficult to meet the requirements.

Therefore, depending on aluminum oxide is required to master different. To do this, different types of aluminum aluminum parts also allow lashing in the same bunch as they may therefore not control their proper oxidation time.

Different types of aluminum through a conductive chemical conversion treatment, aluminum exterior color difference different than for any other process recipe oxide film obtained difference more obvious. Generally, the higher the purity aluminum, the slower the film; Conversely, if the aluminum purity is lower, then it will equally faster deposition rate.

By use of aluminum alloy, surface treatment requirements classification

Aluminum is the rod by hot melt extrusion, to obtain different cross-sectional shapes of an aluminum material.

First, use can be divided into the following categories:

1 building with windows and doors aluminum doors and windows (divided into two kinds of windows, doors and curtain walls).

2. CPU dedicated radiator aluminum radiator

3 shelves aluminum alloy, the difference between them is that different cross-sectional shape, but are out of the hot-melt extrusion.

Second, according to alloy into a Category:

Can be divided into 1024,2011,6063,061,6082,7075 grade aluminum and other alloys, the most common of which six lines of different grades of difference is that the ratio of metal components is not the same, in addition to the commonly used aluminum windows and doors such as 60 series, 70 series, 80 series, 90 series, curtain wall series aluminum construction, the industrial aluminum is no clear distinction between models, most production plants are in accordance with the customer's actual drawing processing.

Third, by surface treatment requirements Category:

1 Anodized Aluminum

2 electrophoretic coating aluminum

3 Powder Coating Aluminium

4 grainy transfer aluminum

5 planed aluminum

Mastic awareness and understanding of complex aluminum

Aluminum Alloys and polymer composite insulating material is a combination of new windows, doors and curtain wall building materials. Through this combination of aluminum profiles form a central insulating interlayer, thus achieving "insulated aluminum" purposes. Insulated aluminum composite bridge mainly wear strip with mastic two types.

Mastic composite aluminum heat energy technology originated in the United States, in general, these techniques are the polymers and aluminum mixed. Companies on behalf of the United States Eliasson type composite aluminum casting technology, by pouring the bridge molded polyurethane insulation inside and outside the two-part aluminum bonding formed into a whole in order to achieve energy-saving purposes. Its performance, technology, cost and so very satisfactory. From the late 1930s, with the widespread use of aluminum doors and windows, some of the innovative American designers began to consider the aluminum door and window insulation is poor, so as to effectively solve the aluminum energy-saving technologies.

Aluminum melt transfer and pouring Precautions

Although the density of solid aluminum oxide similar to the density of molten aluminum, the aluminum melt entering the inside, after a sufficiently long time to sink to the bottom of the crucible accompanied. The molten aluminum is oxidized to form an alumina film, but only in contact with the aluminum alloys melt side is dense, porous side in contact with air and a large diameter 60 - 100A holes, surface area, adsorption strong, easily adsorbed moisture, anti there is a tendency to float. Thus, the oxide film and the small difference in the proportion of aluminum melt, mixing it with the melt, drifting very slowly, it is difficult to exclude from the melt, the formation of pores in the casting too inclusions. Therefore, the key transfer molten aluminum is to minimize the mixing of the molten metal, the melt to minimize contact with air.

Tilting crucible using transfer note melt, to avoid melt mixed with air, it should try to rely on the furnace ladle nozzle, and tilted so that the melt downstream along the side wall of the ladle, will not underwrite the direct impact , the occurrence of agitation, splash and so on.

Pouring the correct and reasonable approach is to get one of the important quality castings. Note the following for preventing, reducing casting defects is very effective.

(A) should be carefully checked before pouring the melt tapping temperature, ladle capacity and dryness of the surface coating layer, whether it is another tool to prepare either. Before pouring the metal pouring cup 3 - 5 minutes in a good place on the sand, when the ladle temperature not higher than the breast 150 degrees, placed premature or excessive temperature, the inner runner choked lot of gas, in pouring a risk of explosion.

(B) is not on a "Guotang Feng" in a case casting, and the strong melt oxidation, burning, produce the casting defects such as oxide inclusions.

(Three) obtained from the crucible melts, should be used to underwrite gently poke the melt surface oxide or flux layer, slowly ladle immersed in the melt, a wide mouth with ladle scooping melt , and then lift the ladle smooth.

(Four) do not end when the package palm flat, the pace should be steady, not raised too high ladle, ladle metal surface must be stable, without rope move.

(Five) about pouring should Grilled net ladle slag, slag will avoid casting, oxide, etc. into the mold.

(Six) in the casting, the melt flow to remain stable, can not be interrupted, not straight into the arms of the bottom outlet port. Gate pregnant mother to the end shall be filled from the liquid level shall not turning, casting speed should be controlled properly. Typically, the degree to slightly slower start pouring the melt filling smooth and slightly faster, and casting speed remained unchanged.

(Seven) in the casting process, ladle nozzle and the distance runner as close as possible to the extent of not more than 50 mm in order to avoid excessive oxidation of the melt. ,

(Eight) with a blocked gate arms, blocking is not reversed too early in the melt filled the gate arms, then slowly oblique aside, so as not to melt when the injection sprue vortex.

(Nine) from the bottom of the crucible 60 mm below the melt should not be pouring castings.