STMS providing also Pickling & Passivation, which can corrode in service if the surface is contaminated. Both Pickling and passivation are chemical treatments applied to the surface of stainless steel to remove contaminants and assist in the formation of a continuous chromium-oxide, passivation film Pickling and passivation are both acid treatments and neither will remove grease or oil. if the fabrication is dirty, it may be necessary to use a detergent or alkaline clean before pickling or passivation.
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