交流电流密度对X65钢在碳酸盐/碳酸氢盐溶液中腐蚀行为的影响

Effects of AC current density on the corrosion behavior of X65 steel in carbonate/bicarbonate solutions

摘要: 通过极化曲线测试、浸泡实验和表面分析技术研究了不同交流电流密度对X65钢在碳酸盐/碳酸氢盐溶液中腐蚀行为的影响.随交流电流密度的增加，钝化区宽度明显变窄，点蚀击破电位负移，维钝电流密度增大，腐蚀速率增加.在低交流电流密度下（<100 A·m^-2），维钝电流密度、点蚀程度和腐蚀速率均略增加；在高交流电流密度下（≥100 A·m^-2），维钝电流密度、点蚀程度和腐蚀速率均快速增加.

Abstract: The effects of AC current density on the corrosion behavior of X65 steel in concentrated carbonate/bicarbonate solutions were studied by potentiodynamic polarization curve measurement,immersion testing and the surface characterization technique. When the AC current density increases,the passive region significantly narrows,the pitting potential negatively shifts,the passive current density increases,and the corrosion of X65 steel accelerates. At low AC current density(100 A·m^-2) the passive current density,the pitting corrosion degree and the corrosion rate slightly increase with the increasing of AC current density,but at high AC current density(≥ 100 A·m^-2),they increase rapidly.