Stainless steel passivation is the chemical process that removes free iron from the surface of stainless steel for the purpose of enhancing corrosion resistance. Allegheny Surface Technology (AST) offers either citric or nitric acid passivation based on your specific requirements. Metal passivation is but one of several pretreatment steps available for preparing an article for further processing such as electropolishing, or to perform a superior cleaning operation on welded structures.
Passivation creates a chromium rich surface which can form an invisible inert (passive) oxide layer as soon as it is exposed to an oxygen-containing environment (air).
Passivation will not change the appearance of the stainless. If the stainless has been heat treated or welded, the resulting scale or discoloration must be removed by either abrasive methods or by pickling. Passivation will not cause any change to the surface roughness. To verify the effectiveness of the passivation, Allegheny Surface Technology applies saline, copper sulfate, and ferroxyl testing to ensure a successful passivation.
Have more questions? Feel free to contact one of our Passivation specialists by calling (866) 266-9293, or Request a Quote right here on our website.
Allegheny Surface Technology is your trusted provider of high-performance, ASTM and BPE compliant electropolishing, pickling, mechanical polishing, and passivation services. Specializing in both in-house and on-site stainless steel surface refinishing/refurbishment services, AST assures both the quality and reliability of our services through multi-step Quality Assurance and inspection protocols.Request a Quote