The issue of stainless steel being contaminated by carbon steel
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If stainless steel is contaminated by carbon steel and the carbon steel is removed, but the contaminated area is not treated, could this lead to more severe contamination?
Stainless steel is not contaminated by carbon steel; rather, it is the high temperatures generated during welding stainless steel with carbon steel that lead to a decrease in the chromium content in stainless steel, resulting in deep-level contamination.
Contamination after contact occurs due to differences in carbon content, which lead to carbon transfer as a result of these variations. If this issue is not addressed, it becomes difficult for a passive film to form on the stainless steel in this area, thereby increasing the likelihood of corrosion there
This post was last edited by Young Builder on 2015-7-20 08:43. Not only is welding them together a problem, but stacking them together as well can cause pollution.
Hello, moderator – will this corrosion continue to progress deeper? Or only in polluted areas?
In this situation, if left to develop unchecked, I think the corrosion will continue to progress. After all, the principle by which stainless steel resists corrosion is the formation of a passivation film. Think about it: if there were no passivation film, wouldn’t corrosion continue? The formation of the passivation film is mainly due to oxidation; the corrosion process is not just oxidation.
What about carbon steel that has been pickled and passivated? What will happen if it’s placed next to stainless steel? We welcome you to participate actively in these activities – rewards in the form of wealth and food are waiting for you! The fun chemical engineering event “Spending Money” is back in its second season: the 【Chemical Engineering Techniques】 “Strange vs. Wonderful” design sharing event. http://bbs.hcbbs.com/thread-1419966-1-1.html
I think for the damage you need to deal with, just remove the rust, and then wash it with acid cleaning paste
If they are piled up for a long time, carbon infiltration will definitely occur; as for welding, there is the issue of excessive welding electrode use
Haha, the migration of atoms within metals isn’t that easy or rapid; the scratches on the surface of stainless steel caused by stacking disappear after pickling, and pickling serves the purpose of forming a dense oxide layer. Welding mainly results in the loss of stainless steel elements, leading to a chromium deficiency in the welded area and an increased risk of corrosion. Solvent treatment of the weld seam serves to reduce these differences in chemical composition.
Even when placed together after passivation, uneven carburization can occur, as there are differences in carbon content after all