Metal finishing Q&As since 1989
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Passivating/Pickling
After Tig welding stainless steel tubing, we then go through the process of pickling/ passavating the heat spots. This is done in the usual manner using acid cleaning and then scrubbing off with scourer pads. My question is that does anyone know of a quicker or easier way to remove the weld heat marks off the stainless.
John KernanStainless steel manufacturing - Brisbane, Qld, Australia
2005
The last couple of times we printed similar inquiries, we were inundated with responses that were ads for proprietary pickling pastes and electrolytic stain removal machines, John. So we suggest that you try those terms with a search engine. We will print any TECHNICAL responses we get, but we can't print ads or testimonials or patent numbers. Good luck.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2005
John
I am not sure where to find documentation, but I know some shops use a heated potassium permanganate [on
eBay or
Amazon] solution, followed by a nitric acid dip to remove the weld scale. It is somewhat time consuming, but not labor intensive. The scale comes off faster if it is brushed immediately after welding.
- Colorado Springs CO
2005
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