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.