Stainless Steel Passivation is a process by which stainless steel will form an invisible, passive,chemically inactive, corrosion resistant layer on the surface. Passivation of steel is removal of exogenous iron by means of chemical process.

Alcoats performs S.S.Passivation according to the specification ASTM A 967. This specification covers minimum requirements such as pre-treatment of the surface like solvent cleaning, degreasing, passivation procedure, testing during qualification and inspection for passivation of Austenitic stainless steels such as SS304/304L and SS316/316L with more than 16%Chromium in the alloy content. Passivation is required to improvise the corrosion resistance and/ or impart better adhesion to the organic coating on stainless steel.

This process is performed when the surface is free from iron, oxide scale, rust, metal chips or any other deposits which might affect the stability and sanity of the surface.The process of passivation can only be done on the clean surface. Passivation of SS with Chromium greater than 16% shall be performed by adding nitic acid of different concentration for specific time and temperature.