![]() The chemical treatment of stainless steel with a mild oxidant, such as a nitric acid solution, for the purpose of the removal of free iron or other foreign matter.”įurther, ASTM A380 states that passivation is: According to ASTM A967, the definition of passivation is: What does passivated stainless steel mean?įor manufacturers, the industry standards ASTM A967 and AMS 2700 represent the most widely used standards for passivating stainless steel. ![]() Passivation prevents rust in stainless steel The chemical treatment leads to a protective oxide layer, or passivation film, that is less likely to chemically react with air and cause corrosion. In stainless steel, the passivation process uses nitric acid or citric acid to remove free iron from the surface. Passivation is a widely-used metal finishing process to prevent corrosion. What is passivation, and how does the passivation process work? How do I passivate stainless steel parts after machining operations? These are questions commonly asked by machine shops and manufacturers of part materials such as stainless steel, titanium and tantalum.
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