| http://www.w3.org/ns/prov#value | - Passivation can be observed with materials such as aluminum, magnesium, copper, stainless steel, titanium, and silicon, when they are exposed to air and water at moderate pH. By contrast, the rusting of iron, which involves the formation of mixed oxides, is not considered passivation because the layer is not protective and usually grows to be much thicker.
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