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Passivating of stainless: Passivation is the removal of exogenous iron or iron compounds from the surface of stainless steel using an acid solution that will remove the contamination but will not significantly affect the stainless steel itself. This is necessary because during handling and processing such as rolling, forming, machining, pressing, tumbling, and lapping, particles of iron or tool steel maybe embedded or smeared on or into the surfaces of stainless steel components. If these particles remain they may corrode and produce rust spots.