Abstract
Conversion electron Mossbauer spectroscopy (CEMS) was used to study the corrosion products by sulfuric acid water. The acid water was put on the iron foil and evaporated under the atmosphere of several oxygen ratios in nitrogen-oxygen gas mixture in order to investigate the influence of oxygen contents on the corrosion products. The hyperfine fields of the observed sextets at 15 K suggest that the corrosion products consist of α-FeOOH, γ-FeOOH and γ-Fe2O3. The amount of γ-FeOOH becomes larger as the oxygen concentration increases. It is also found that the amount of γ-Fe2O3 becomes the largest at 1.4 % of the oxygen concentration.
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