Powder Coating Q&A: Pretreatment for Stainless Steel
What is the requirement for coating stainless steel?
Q. I am working for ELGI Ultra Industries Ltd. as the vendor development manager. I have a requirement for powder coating SS 202 (stainless steel) material and I want to know the process, especially the pretreatment.
A. Stainless steel is chemically inert so there is no good chemical treatment for adhesion of a powder. I suggest you media blast the surface to roughen it for a good mechanical bond. Just be careful not to blast too aggressively and leave the surface too rough in appearance. Application should be the same as any other substrate. With a roughened surface you will need to apply enough film to adequately cover any peaks on the surface.
Originally published in the December 2015 issue.
Question: I’ve been told that a powder coated part cannot be “touched-up.” I have some patio furniture that I had powder coated and the powder coating shop that did the work for me stripped the threads in holes used to rack the part.
I am an engineer on a large yacht build project and urgently need information and advice on choosing a finish for the aluminum deck plates in the engine room.
Powder coating is one of the most durable finishes that can be applied to industrial manufactured products, and offers excellent corrosion protection and is very safe because of its lack of volatile organic compounds.