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As defined by MIL-STD-753C, a passivation process is a final treatment/cleaning process used to remove iron from the surface of corrosion-resistant steel components, resulting in a more uniform passivated surface formation for enhanced corrosion resistance.Stainless steel differs from other metals in that the composition of the metal actually changes when you get close to the surface. During passivation, free iron is removed from the surface into solution, leaving behind a higher chromium content. A good chromium to iron ratio is gen... more