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Passivation Services in Orlando
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.”
Passivation Benefits
- no dimensional change
- uniform conversion of existing metal
- decorative coating can be used
- better movement for oiled parts
- decrease light reflection
- removes impurities
- relieves stress
The 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 that may 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).
Specifications
- ASTM A967M
- ASTM A380M
- AMS 2700 - Method 1, Method 2
- QQ-P-35
- Types II, VI, VIII