Effects of pH and Dissolved Oxygen on Electrochemical Behavior of Stainless Steel in High Temperature Water

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  • 高温水中におけるステンレス鋼の電気化学的挙動に及ぼすpH及び溶存酸素濃度の影響
  • コウオンスイチュウ ニ オケル ステンレス コウ ノ デンキ カガクテキ キョ

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Corrosion kinetics of SUS 304 stainless steel and redox reaction kinetics on platinum were investigated in high temperature water using corrosion potential measurements and polarization resistance measurements by galvanostatic transient technique. Active-passive-transpassive behavior of SUS 304 stainless steel was revealed as functions of pH and dissolved oxygen concentrations. Above pH 4, SUS 304 stainless steel is passivated at dissolved oxgyen concentrations between 200 and 1000ppb. At pH 3, depassivation occurs at dissolved oxygen concentrations below 1000ppb. Cathodic processes change from the reduction of dissolved oxygen to the direct reduction of proton and/or water with decreasing oxygen concentration and pH. Large corrosion rates of SUS 304 stainless steel under deaerated conditions may be attributed to aggressive corrosivity of high temperature water itself. The relationship between the corrosion kinetics of SUS 304 stainless steel and the redox reaction kinetics on platinum is discussed.

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