From Astro Pak Corporation
Passivation of austenitic stainless steel surfaces has been practiced on high purity water systems for many years, and is
generally defined as the removal of iron and iron compounds from the surface to improve the passive film and increase
corrosion resistance. The surface chemistry, structure and related corrosion resistance of austenitic stainless steel is affected
by mechanical polishing, welding, and most fabrication techniques. Passivation reduces or eliminates this damage
while forming a more corrosion resistant passive film higher in chromium oxide. There have been many technical papers
that have presented evidence on effectiveness of passivation and especially for the benefits of citric chelant processes 1,
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Mohamed Saleem and Sowmya Krishnan, and Dafna Beery and Aleks Kabansky, involves the use of many corrosive and reactive gases, including hydrogen chloride, hydrogen bromide, hydrogen fluoride, and...
Passivation is a chemical process that is used to help restore contaminated stainless steel to original corrosion specifications. Parts are placed in baskets and submersed into a diluted nitric acid...
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