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.
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