ASTM-A380 or ASTM-A967
What is Chemical Passivation?
By enhancing the formation of a protective passive layer on stainless steel, passivation maximizes the corrosion resistance inherent in the metal.
Chemical passivation is a two-step process: First we use acid to dissolve any free iron or iron compounds from the surface, otherwise this iron will create a localized site where corrosion can continue. The surface itself is not affected by this process. Secondly, we use an oxidizer to force the conversion of chromium metal on the surface to the oxide form. This creates a uniform chromium oxide protective layer.