溶融Na<SUB>2</SUB>SO<SUB>4</SUB>-K<SUB>2</SUB>SO<SUB>4</SUB>-Fe<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB>によるステンレス鋼およびCr-Mo鋼の高温腐食の電気化学的研究

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  • Electrochemical Study of Hot Corrosion of Stainless Steels and Cr-Mo Steel in Na<SUB>2</SUB>SO<SUB>4</SUB>-K<SUB>2</SUB>SO<SUB>4</SUB>-Fe<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB> Melt
  • 溶融Na2SO4-K2SO4-Fe2(SO4)3によるステンレス鋼およびCr-Mo鋼の高温腐食の電気化学的研究
  • ヨウユウ Na2SO4 K2SO4 Fe2 SO4 3 ニ ヨル ステンレス

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Corrosion of iron, nickel, chromium, stainless steels and Cr-Mo alloy in (Na, K)2SO4-Fe2(SO4)3 melt has been studied with the electrochemical polarization technique at 923 and 973 K under SO2-O2-CO2 atmosphere. The rate of corrosion estimated from polarization resistance was consistent with that obtained from mass loss. With the increase in chromium content of the alloys, the rate of corrosion decreases shifting the corrosion potential to anodic direction. This behavior was well explained by the superposition of the partial anodic and cathodic polarization curves. The partial cathodic reaction is the cathodic reduction of ferric ion in the melt, which was independent of the composition of the alloys. The anodic polarization curves exhibit a passive region. Both the currents at the peak and the passive state decrease with the increase in chromium content of the alloys. Therefore, high chromium alloys are highly corrosion resistant in molten sulfate. The result is well consistent with that obtained by Salt-coating test.

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  • 日本金属学会誌

    日本金属学会誌 51 (4), 342-349, 1987

    公益社団法人 日本金属学会

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