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Passivation is a chemical surface treatment primarily applied to stainless steel and other corrosion-resistant alloys to enhance their corrosion resistance by removing free iron and surface contaminants. The process typically involves immersing the part in an acidic solution, such as nitric or citric acid, which cleans the surface and promotes the formation of a stable, chromium-rich oxide layer. This protective layer significantly reduces the risk of oxidation and galvanic corrosion, especially in harsh or humid environments. Passivation does not alter surface roughness or dimensions, preserving tolerance and geometry, which makes it ideal for precision components. It is often used after machining, welding, or forming to restore the material's natural corrosion-resistant properties. The treated surface remains metallic in appearance and may exhibit a slight improvement in surface cleanliness and luster. Passivation is commonly used inaerospace ,medical , food-grade, and marine applications where material longevity and cleanliness are critical. The process complies with standards such as ASTM A967 and AMS 2700, ensuring consistency and reliability.
Stainless Steel, Copper, Brass.
Typically maintained 0.8 µm (32 µin) is preferred before passivation.
Matte to bright silver finish (no numerical value; visual).
High – removes minor weld discoloration and surface stains.
Black Oxide, Electroless Nickel Plating, Electropolish, Zinc Plating, Tumbling, Media Blasting
Smooth glossy finish.
6061 T6, 6082, 7075-T6, 5083-H111, 6063, 5052, 2024-T351, 7050, 2017A, 6082-T651, 7075-T651, 2014, 6061-T651, 7075-T7351, 6082-T6, 2014-T6, 6063-T5, 6063-T6, 5083-H32, 5052-H32
A2 Tool steel, D2 Tool steel, A3 Tool Steel, O1 Tool Steel, S7 Tool Steel, H13 Tool Steel
932 Bearing Bronze , 954 Bearing Bronze, 544 Bearing Bronze
Passivation does not significantly alter the hardness of the metal surface. Its primary purpose is to enhance corrosion resistance by removing surface contaminants and promoting the formation of a protective oxide layer.
While passivation cleans the surface and removes contaminants, it does not significantly alter the metal's appearance. However, it can lead to a more uniform and clean surface, enhancing its aesthetic appeal.
Passivation is suitable for most stainless steel grades. However, the effectiveness and specific procedures may vary depending on the alloy's composition and the intended application. It's advisable to consult with a passivation specialist to determine the best approach for your specific needs.