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I just want to ad one more potential issue that may cause SS corrosion - The surface contamination with the free iron.
Basically all finishing equipment like buffing and polishing wheels and polishing compounds should only be used to polish SS and should never be used to polish carbon or middle steel.
If polishing wheel is contaminated with the Iron from the previously polishing carbon or middle steel, it will transfer iron particles into the SS surface, now if combined with the sweat from the hand it will form a cell and cause galvanic corrosion.
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