What does passivation do? Essentially, the passivation process makes stainless steel more resistant to rusting or staining. In layman's terms, it makes stainless steel even more stainless. Steel is never 100% stain-proof, but with proper passivation it will be as close as possible.

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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