What Does Passivation Do?
Passivating stainless steel removes microscopic iron particles that have been deposited during manufacturing steps. By removing the iron, the steel's chromium reacts with oxygen, forming an invisible, protective layer. To qualify as "stainless," steel must have a chromium content exceeding 10.5 percent.
What Does Passivation Not Do?
In general, passivation does not discharge existing stains or rusting. That requires other methods, such as light abrasion, bead blasting, tumbling and sometimes sanding. Passivation also does not remove weld scale, black oxides and burn marks from welding. That's done through pickling, which is often done in conjunction with passivation.
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