The use of the copper sulphate test is limited to oxide coatings having a thickness less than 5 m. This test enables a rapid check. It makes it possible to verify whether a fault on the surface of the coating corresponds to a local gap in the coating (i.e. revealing bare metal).
Status : WithdrawnPublication date : 1976-11
Edition : 1
Technical Committee:Organic and anodic oxidation coatings on aluminium