18 years ago
I am working in the biotech industries and in this working field for
production equipment stainless steel is used. In my department people work
with 316L or 304L SS micro mesh filter screens. These screens are ordered at
external company. Before we use these screens in our production process they
are treated with Sodium Hydroxide solution and after the base rinse they are
treated with Nitric Acid solution. Does anybody in this newsgroup knows what
is the sense of this process? We call it a passivation process...