Abstract
AbstractA study of the reactions of chromate with iron has been made. The amount of chromium in the passivating film has been measured using radio‐active chromium and by chemical analysis. The surface of the iron after exposure to chromate was examined by auto‐radiography, electron diffraction and electron microscopy. It was concluded that passivity of iron in chromate solutions is caused by the formation of an oxide film about 100 Å thick containing about 25% Cr2O3 and 75% γ‐Fe2O4.
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