![]() ![]() A chemical treatment shall be applied which will accelerate the formation of the passive film on a chemically clean stainless steel surface. The chemical reactions of the passivating media on the surface of the stainless steel shall be stopped by rinsing of the stainless steel part, with or without a separate neutralization treatment. Immediately after the removal from the passivating solution, the parts shall be thoroughly rinsed, using stagnant, countercurrent, or spray washes, singly or in combination, with or without a separate chemical treatment for neutralization of the passivation media. ![]() The treatments are the following: immersion treatment using nitric acid solutions, immersion treatment using citric acid solution, and electrochemical treatment. This covers several different types of chemical passivation treatment for stainless steel parts. ASTM A967 Chemical Passivation Treatment for Stainless Steel
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