Passivated Stainless Steel

Passivation is a method of removing free iron contaminants from the surface of stainless steel. Passivation improves the corrosion resistance properties by facilitating the formation of a very thin, transparent oxide film, which protects the stainless steel from "selective" oxidation.

The process typically begins with a thorough cleaning cycle. It is intended to remove soils such as oils, forming compounds, lubricants, coolants, cutting fluids and other undesirable organic and metallic residue left behind as a result of fabrication and machining processes.

The passivation phase consists of immersing the stainless steel components in a controlled solution of either citric or nitric acid. The immersion process dissolves any free iron contamination that may have been imbedded as a result of grinding, machining or other manufacturing operations but will not significantly affect the stainless steel itself.

The free iron contaminants are potential corrosion sites which, if not removed, result in premature corrosion and ultimately result in deterioration of the component.

Passivation Features & Applications

ASTM A967 – Citric Acid / Nitric Acid
Medical, Military, Aerospace, Biotech, Pharmaceutical, Cosmetics
Testing – Water Immersion, Copper Sulfate, Salt Spray ASTM B117
Maximum Stainless Steel Corrosion Protection without Plating or Coating
Superior Clean Surface
No Rust Appearance Discoloration
Optimal Surface Preparation for Subsequent Coating or Non-Ferrous Metalizing

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