Abstract
During exposing pearlitic steels to nitrate solutions, three mechanisms of iron transfer from the metal phase into solution are observed, depending on the solution pH and the presence of oxidants. The process yields either bivalent iron, colloid-disperse compounds of trivalent iron, or a lepidocrocite deposit. Oxide films thus formed have different protective value. A mechanism explaining the effect of different factors on the protective effectiveness of the oxide films is proposed.
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