Hot Corrosion of Fe–Cr Alloys in Hydrogen Chloride Gas and Gas Mixtures of Hydrogen Chloride and Oxygen

DOI Web Site 参考文献4件
  • Ihara Yoshinao
    Central Research Laboratories, Toyo Soda Manufacturing Co., Ltd.
  • Ohgame Hideji
    Central Research Laboratories, Toyo Soda Manufacturing Co., Ltd.
  • Hashimoto Koji
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

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  • Hot Corrosion of Fe–Cr Alloys in Hydrogen Chloride Gas and Gas Mixtures of Hydrogen Chloride and Oxygen

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The corrosion behavior of Fe–5, −13 and −25%Cr alloys in hydrogen chloride gas containing 0–75 vol% oxygen at temperatures between 573 and 923 K was investigated by means of a thermogravimetric technique and by measuring the mass loss and X-ray analysis of the scales. In hydrogen chloride gas, the corrosion rate was determined by the formation and sublimation of divalent chlorides of iron and chromium. Addition of chromium to iron effectively decreases the corrosion rate at temperatures lower than 673 K. The scale formation rate increased with increasing chromium content of the alloys at 673 K or higher temperatures, and only FeC2 selectively sublimed up to 873 K. Addition of oxygen to hydrogen chloride gas effectively suppressed corrosion of Fe–Cr alloys containing 13% or more chromium at relatively low temperatures due to formation of a protective corundum-type oxide scale. The temperature range for the protective scale formation was raised with increasing alloy chromium content and oxygen content of the gas mixture. Further rise in temperature accelerated corrosion due to sublimation of FeCl3 and CrCl3 as a result of oxychlorination.

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