Passivation
Passivation is a non-electrolytic process typically using nitric acid which removes free iron from the surface of stainless steel. Obtained from cutting and machining tools, the free iron, if not removed from the surface of stainless steel, will react to the atmosphere and cause corrosion. The purpose of the process is to make the material become "passive" that is, less affected or corroded by the environment for future use.
Capability:
Process: Type II (Nitric 1)
Type VI (Nitric 2)
Standard Compliance: A967, QQ-P 35C, AMS2700