Passivation is an immersion process where the free iron is chemically removed from the surface of stainless steel or various other alloys. The removal of superficial iron is performed by chemical dissolution. It removes the surface contaminant without affecting the stainless steel.
Current stainless steel passivation specifications are:
• QQ-P-35
• ASTM-380-13
• ASTM-967-13
• AMS-2700 REV E.