Passivating Stainless Steel – The Passivation Process
The two standards are virtually identical in regards to the what is required in the passivation process. They both allow for the use of nitric acid and citric acid solutions, the latter of which is the newer, more effective method. More specifically, the standards prescribe the concentrations, temperatures, times and water quality required for passivating stainless steel.
Stainless steel parts that are to be passivated must be clean, including immediately prior to the passivation process. Though this is generally accepted as a best practice, it is not specifically required in the standards mentioned above. The parts are then placed in a solution where they remain for a predetermined amount of time. From there, the parts are double-rinsed using clean water and then dried thoroughly.
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