Anodizing of aluminium and its alloys. Check for continuity of thin anodic oxidation coatings. Copper sulfate test

Anodizing of aluminium and its alloys. Check for continuity of thin anodic oxidation coatings. Copper sulfate test

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1   Scope

This document specifies a method for checking the continuity of thin anodic oxidation coatings on aluminium and its alloys by a copper sulfate contact test.
The use of this method is limited to anodic oxidation coatings of thickness less than 5 µm or coatings that have been deformed, which includes those produced by coil anodizing techniques.

NOTE The method described enables a rapid check to be made for the continuity of a thin coating of aluminium oxidation on aluminium and its alloys. In cases of doubt regarding a visible fault on the surface of a coating, the use of this method makes it possible to verify whether the fault corresponds to a local gap in the coating that exposes bare metal.