How does a relatively small amount of chromium prevent steel from rusting?
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All the answers miss an important step taken with stainless steel…Passivation
Passivation uses an acid wash to remove any iron on the surface leaving behind only the chromium (and nickel). The chromium then oxides and you left with a layer of only chromium on the outside that does not rust.
Otherwise you will get stainless steel that actually rusts.
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