Passivation

Passivation of stainless steel removes free iron from the
surface of a stainless steel component and and forms a thin,
dense oxide protective barrier. The most commonly used
chemical method to passivate a stainless steel surface is to
apply nitric acid. Nitric acid is a strong mineral acid and will
quickly dissolve all iron compounds and other trace metals
on the surface. It is also a strong oxidizer and will
simultaneously activate the chromium oxide layer. We also
use phosphoric acid and citric acid, depending on the desired
end result. Our chemical engineers work with our finishing
services centers teams to determine the best passivation
methods for your medical components.