The Anodic Deposition of Oxide Films on Platinum from Ferrous Sulfate Solutions

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Abstract
A study has been made of the effect of pH and Fe++ ion concentration on the anodic deposition from ferrous sulfate solutions of ferric oxide type films on a platinum substrate. Examination of the deposition kinetics and film composition was made. The rate of deposition was increased by increases in pH and ferrous ion concentration. The films were mainly γ‐FeOOH but also contained small amounts of water, Fe++, and sulfate ions. The proportion of sulfate decreased markedly with an increase in pH. It was concluded that the film is deposited mainly by the diffusion and oxidation of a complex hydroxy ferrous ion with some contribution from a sulfate containing ion. The relationship of these films to anodically formed passive films is discussed.

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