Passivating is removing any free iron at the surface of a forged or welded stainless piece. Can be done as simply as soaking in a citric acid solution (sold in the backing/canning section of the supermarket) to as fancy as buying specific stuff made for it at the welding supply store.
generally you don't even need to do that; but if you live in a climate that is rough on metal it will help.
Thomas
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Thomas
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