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Stainless Steel "rust" marks on paint
On Wed, 28 Mar 2007 15:03:32 -0500, Don W
wrote: Bruce wrote: snip--Eric's good primer on pickling and passivation of austentetic stainless steels Pickling and passivation Thanks for quote. I knew that stainless reacted with oxygen to form a non-corrosive surface and that unless you had a flow of water the lack of dissolved oxygen might result in crevice corrosion but somehow had never related it to pasivating. I'll now use at least come nitric acid as an oxidizing agent. Bruce in Bangkok (brucepaigeatgmaildotcom) Bruce, I'll try to steer you to looking into stainless steel passivation using strong citric acid (ie Citrisurf, etc.) once more. I've not time to provide the relevant links at the moment. Use nitric acid if you like. It works also, although not as well as citric acid according to various studies. It is also much more hazardous to transport and dispose of. Citric acid can be diluted and legally flushed down the drain. Citric acid passivation for SS is fairly new technology, and Nitric acid is the traditional way of doing it. Citric acid can also be used with a power supply to electropolish stainless steel. The people who turned me on to the citric acid passivation do a lot of industrial and food grade stainless welding and have switched over. Good luck, Don W. Don't get me wrong, I really appreciate your information. My reply was supposed to indicate that while I knew that stainless needed a certain amount of oxygen to be "stainless" I had never related that information to the passivation process. Citric acid may prove a problem though as I live in Thailand thousand and some things are just not available. Add to this the (sometimes) problem with translating technical terms and life sometimes becomes very frustrating. However, when I return to Bangkok I'll stop by my chemical supply place and see what is available. One nice thing about Thailand is that it is still primitive enough that people actually want to sell you things. You go to a large chemical supply house and say, "I need a liter of a 6-1/3% solution of nitric acid and distilled water and they never blink an eye. Just apologize for not being able to hand it to you straight away and ask you to come back tomorrow morning, about 09:00. Bruce in Bangkok (brucepaigeatgmaildotcom) -- Posted via a free Usenet account from http://www.teranews.com |
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