Stainless Steel Passivation Process
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The effectiveness of passivation is verified via accelerated corrosion tests, such as salt spray, high humidity and water immersion or a copper sulfate immersion. The type of stainless steel determines the most effective passivation process. Time, temperature and concentration are all determined by the type of alloy being processed. The two primary types of passivation utilize either nitric or citric acid solution. Although nitric acid is the most popular because of its history of proven results, citric acid is more environmentally friendly.
Typical specifications for passivation include QQ-P-35 and ASTM A- 967