RapidDirect Passivation Services

Stainless steel passivation is a chemical treatment that removes free iron and other contaminants and promotes a thin, protective passive oxide layer, improving corrosion resistance.

Yes. Stainless steel naturally forms a protective oxide layer when exposed to oxygen. Chemical passivation removes surface contamination and helps restore the protective condition of the surface.

Depending on the requirements, inspection may include visual examination, tests for surface iron such as a ferroxyl test, and corrosion testing. The appropriate test and acceptance criteria should be specified for the part.

They are different surface treatments. Electropolishing uses an electrochemical process to remove surface material and improve finish; electropickling removes surface oxides and scale. Passivation focuses on removing contaminants and promoting a protective passive surface.

Both can be used for stainless steel passivation. Nitric acid is an oxidizing acid, while citric acid removes free iron and promotes formation of the protective passive layer. The choice depends on the material and process requirements.

The standard term for the process is passivation.