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