Passivation Process

Description of Passivation Process

Passivation is the removal of exogenous iron or iron compounds from the surface of a stainless steel by means of a chemical dissolution, most typically by a treatment with an acid solution that will remove the surface contamination but will not significantly affect the stainless steel itself. Passivation is the chemical treatment of a stainless steel with a mild oxidant, such as a nitric acid solution for the purpose of enhancing the spontaneous formation of the protective passive film. Citric Acid is now an acceptable method of Passivation under specification ASTM A967. The Citric Acid process differs from the nitric acid process in the following way; nitric acid dissolves free iron and contaminants, while citric acid acts like a chelating agent and bonds with the contaminants, thus removing them from the surface of the part being processed.

TMF can meet most specifications: A -967, QQ-P-35, A 380 and many more.

Major Industries Served:

Medical
Dental
Pharmaceutical
Marine
Aerospace
Automotive
Food & Beverage
Nuclear - Electronics

Parts Processed Frequently:

Medical Implants - Hygienic components
Endoscopic instruments - Vessels
Wire Products - Bolts & Fasteners
Valves & Fittings - Scuba Equipment
High Purity Oxygen systems - Springs

Materials Processed Frequently:

Stainless Steel (All series)