Passivation is a chemical treatment process used in the removal of iron and iron compounds from the surface of stainless steel alloys. These iron contaminants are invisible to the naked eye and can result from manufacturing operations such as grinding, machining, improper handling, cleaning or storage. Passivation treatment on stainless steel causes oxygen absorption in to the metal surface, resulting in a monomolecular passive oxide film providing a much-desired low corrosion rate of the treated metal surfaces. Passivate common specification are AMS 2700, ASTM A967 and QQ-P-35.

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