高温濃厚LiBr-CaCl<sub>2</sub>混合水溶液中における炭素鋼および低合金鋼の腐食挙動

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  • Corrosion Behavior of Carbon Steels and Low Alloy Steels in Concentrated LiBr-CaCl<sub>2</sub> Solution at Elevated Temperature
  • 高温濃厚LiBr-CaCl2混合水溶液中における炭素鋼および低合金鋼の腐食挙動
  • コウオン ノウコウ LiBr CaCl2 コンゴウ スイヨウエキチュウ ニ オ

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Corrosion behaviors of carbon steels and Cr and/or Mo added low alloy steels were studied in concentrated LiBr-CaCl2 mixed solution. In solutions of CaCl2 up to 21mol/kg·H2O, a concentration of CaCl2 indicating maximum corrosion weight loss of carbon steels was found, which was about 5mol/kg·H2O at 120°C. While in LiBr-CaCl2 mixed solution, the concentration varied with CaCl2/LiBr ratio and sifted to higher concentration with decreasing CaCl2/LiBr ratio. The corrosion rate of carbon steel decreased with the exposure time, while that of low alloy steel remained constant. These fact might be due to formation of thick corrosion product layer with defects such as crevice, where crevice corrosion be accelerated by concentrated Cl-, and dissolved Cr (III) to decrease pH.

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