溶融硫酸塩中における鉄の高温腐食の機構

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タイトル別名
  • Mechanism of Hot Corrosion of Iron in Molten Sulfate
  • ヨウユウ リュウサンエンチュウ ニ オケル テツ ノ コウオン フショク ノ

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Corrosion of iron in alkali-sulfate melt containing Fe2(SO4)3 has been studied with electrochemical polarization technique. The corrosion rate of iron increased with increasing the concentrations of ferric ion below 10 mol%. The polarization curves of iron consisted of the anodic dissolution of iron and the cathodic reduction of ferric ion in the potential region from 0.3 to −0.5 V. Polarization study showed that the corrosion reaction was controlled by a diffusion-limited cathodic reduction of ferric ion and the rate of corrosion was proportional to the concentration of ferric ion. It was found that the cathodic reaction was also promoted by the corrosion product such as ferrous ion which was chemically oxidized and functioned as an oxidant. Thus, the corrosion of iron in molten sulfate was explained by an auto-catalytic mechanism of the corrosion product.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 52 (3), 288-294, 1988

    公益社団法人 日本金属学会

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