氢对600合金在高温高压水中电化学行为的影响

Effect of Hydrogen on Electrochemical Behavior of Alloy 600 in High Temperature and High Pressure Water

通过动电位极化曲线、电化学阻抗谱和计时电流图,研究了电化学充氢对两种热处理态的600合金暴露在高温高压水中电化学行为的影响。结果表明:电化学充氢会增大合金阳极氧化电流密度,并且在70℃NaCl溶液、300℃高温脱氧纯水和高温脱氧模拟一回路冷却水中,充氢会使合金腐蚀电位负向移动,降低耐蚀性能。此外,轧制退火试样表面氢还原反应速率更快,而固溶退火试样在70℃NaCl溶液、300℃高温脱氧纯水和氢化脱氧模拟一回路冷却水中表现出更好的耐腐蚀性能。

The effect of electrochemical hydrogen charging on the electrochemical behaviors of two 600 alloys exposed to high temperature and high pressure water for a long time were studied by overpotential polarization curve,electrochemical impedance spectroscopy and chronoamperometry.The results show that electrochemical hydrogen charging would increase the anodic oxidation current density of the alloy,and in 70℃NaCl solution,300℃high temperature deoxidized pure water and high temperature deoxidized simulated primary circuit cooling water,hydrogen charging would make the corrosion potential of the alloy moving towards the negative direction and reduce the corrosion resistance.In addition,the hydrogen reduction reaction rate on the surface of the rolling annealed sample was faster,while the solution annealed sample showed better corrosion resistance in 70℃NaCl solution,300℃high temperature deoxidized pure water and hydrogenated deoxidized simulated primary cooling water.