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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Procedure for passivating steel

What is the procedure for passivating SS 302 stainless steel that is going to welded with 17-4-PH hardened stainless steel.

Prasath
transducers - Chennai, Tamilnadu, India
2003

I think the procedure is to weld it first, and then passivate it, not vice versa. Prasath. Good luck.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

You always need to passivate after welding. If you use the right formulation, you can do this with excellent results with a citric acid formulation. We have good results with this, even with the 17-4PH in contact with the austenitic steel. Let us know if we can help.

Lee Kremer
Stellar Solutions, Inc.

McHenry, Illinois

2003

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