The Effect of Gas Composition on the Corrosion of Stainless Steels in Molten Carbonate

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  • Nakagawa Kiyokazu
    Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Kihara Shigemitu
    Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd.
  • Ito Shingo
    Engineering Research Center, The Tokyo Electric Power Co., Inc.

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Other Title
  • 溶融炭酸塩中でのステンレス鋼の腐食に及ぼす雰囲気ガス組成の影響
  • ヨウユウ タンサンエンチュウ デ ノ ステンレス コウ ノ フショク ニ オヨ

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Abstract

The effect of gas composition on the corrosion for stainless steels and Ni which are the candidate materials for Molten Carbonate Fuel Cell hardware has been investigated in molten carbonate at 650°C. The following conclusion can be drawn. The corrosion rate of 316L increased with increasing fuel utilization because of increase in PCO<sub>2</sub> in the fuel gas. The corrosion rate of 310S and 35Cr-45Ni alloy with high Cr content was not so accelerated by the fuel utilization. Ni showed excellent corrosion resistance even in 80% utilized fuel gas. In the oxidant gas the corrosion rate of stainless steels increased with increasing PCO<sub>2</sub> as well as in the fuel gas. However, the effect was not so remarkable comparing with in the fuel gas. Oxygen promoted the formation of protective films and increased the cathodic reaction. Therefore, oxygen decreased the corrosion rate of stainless steels at high PO<sub>2</sub>, whereas, it accelerated the corrosion rate at low PO<sub>2</sub>.

Journal

  • CORROSION ENGINEERING

    CORROSION ENGINEERING 37 (8), 473-478, 1988

    Japan Society of Corrosion Engineering

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