plating, anodizing, & finishing Q&As since 1989
How does a passivation layer get produced on stainless steel
Could you please tell me how a passivation layer occurs in a new stainless steel system. Is this passivation layer induced chemically or it does it just occur?Kim Deberry
- Pittsburgh, Pennsylvania, USA
The passivation layer occurs chemically, either naturally or induced by a chemical bath of some kind. Depending on the grade of stainless steel the process of passivation can be quite different and the results quite different. The passive layer that you want to form is a chromium oxide/ nickel oxide layer that is very resistant to corrosion. You can refer to ASTM A967
for more information and procedures.
However, in order to get the BEST passive layer it is always necessary to passivate the surface with a chemical to remove free iron and chromium enrich the surface of the steel. This gives you a much higher percentage of chromium oxide on the surface. Call us if we can help.
Stellar Solutions, Inc.