Passivation
According to ASTM A380, passivation is “The removal of exogenous iron or iron compounds from the surface of stainless steel by means of a chemical dissolution, most typically by a treatment with an acid solution that will remove the surface contamination, but will not significantly affect the stainless steel itself.” In addition, it also describes passivation as “The chemical treatment of stainless steel with a mild oxidant, such as a nitric acid solution, for the purpose of enhancing the spontaneous formation of the protective passive film.”
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Passivation Benefits
Passivation process removes “free iron”contamination left behind on the surface of the stainless steel from machining and fabricating. These contaminants are potential corrosion sites ultimately result in deterioration of the component if not removed. In addition, the passivation process facilitates the formation of a thin, transparent oxide film that protects the stainless steel from selective oxidation (corrosion).
- SPEC QQ-P-35
- Types II, VI, VII, VIII
- Removes impurities & relieves stress
- ASTM A 967-01
- AMS 2700 B
For more information concerning Passivation, download our Passivation Reference Guide.