![]() ![]() This occurs in stainless steels when they are welded. What you are experiencing is a phenomena called decarburization. I just read your account, in Metal Finishing, of corrosion that occurred on the 304 stainless steel bicycle modules. However, it is expensive, would probably be overkill, and would also introduce some new variables that would have to be tamed-probably not what you're looking for right now!Īlthough I've never personally been involved in trying to salvage parts of this nature by passivating them, my feeling is that nitric acid passivation will prove reasonably economical, very practical, and that it will probably work.Ī. But I believe that you are correct that abrasives which have been used on steel should never be used on stainless later, for the reason implied in your letter.Įlectropolishing is more effective as a passivating mechanism than is nitric acid passivation. Abrasives are commonly used on stainless steel, even for mirror polishing. Are electropolishing or passivating options? Are there better finishing options? Who might provide the needed finishing service in the vicinity of Ottawa, Ontario?Ī. What is the best way to remove the rust, leave a bright finish and prevent future tarnishing? The largest component is a base plate 8.2 feet long by 1 foot wide. We have since learned that abrasives should never be used on stainless steel let alone abrasives which have been previously used on ferrous metals. Most of the rusting occurred in areas of weld or areas which were subjected to sanding during fabrication. The modules were then carefully cleaned of rust and waxed, but rusted again after the next rain. They immediately experienced spot rusting after the first light rain. manufacturer fabricate bicycle parking modules from 304 stainless steel for a prestigious client in Canada. Plating, anodizing, & finishing Q&As since 1989 ![]()
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