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Passivation
What is Passivation?
Passivation is a chemical treatment—usually using a nitric acid or citric acid solution—applied to stainless steel and other corrosion-resistant alloys to remove free iron and contaminants from the surface. This process restores and strengthens the metal’s natural oxide layer, significantly improving corrosion resistance without altering the part’s dimensions or appearance.
Passivation is widely used for precision components in the medical, aerospace, food processing, and mold industries, where high cleanliness and long-term durability are essential. It ensures the metal surface remains clean, stable, and less likely to rust during use.
Others Surface Treatment Choice For Parts
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FAQ Of Passivation
Visit our FAQ center for more questions.
Does passivation change the appearance or dimensions of the part?
No. Passivation is a chemical cleaning and oxidation process, so it does not change dimensions and only slightly brightens the surface.
Which materials can be passivated?
Passivation is mainly used for stainless steel, but some other corrosion-resistant alloys (such as certain nickel alloys and titanium) can be treated using similar methods.
Why is passivation needed even for stainless steel?
Although stainless steel is corrosion-resistant, machining, grinding, heat treatment, or handling can leave iron contamination on the surface. Passivation removes these contaminants and restores the protective chromium oxide layer.