利用电化学阻抗谱和极化曲线研究了A3钢在不同浓度的Cl-、SO42-、S2-溶液中的腐蚀行为。结果表明, 阴离子Cl-、SO42-、S2-对A3钢腐蚀速率影响较大。且在相同浓度下腐蚀速率的排序为: S2->Cl->SO42-。随着Cl-、SO42-、S2-浓度的增加, 腐蚀电位负移, 腐蚀电流逐渐增大, 阻抗弧半径减小, 阻抗减小, 腐蚀加剧。混合的侵蚀性离子对A3钢腐蚀速率影响依次为: S2-+Cl->SO42-+S2->SO42-+Cl-。

The corrosion behviors of A3 steel in water with different concentrations of Cl-, SO42-and S2-were studied by electrochemical impedance spectroscopy and polarization curves. The results show that Cl-, SO42-and S2-impact the corrosion of A3 steel greatly. At the same concentration, the corrosion rate could be ranked in the order of S2-> Cl-> SO42-. The corrosion potential shifted towards negative direction and the corrosion current increased gradually with the increase of S2-, Cl-and SO42-concentration. The impedance decreased and the corrosion increased. The corrosion rate of the mixed corrosive anions could be ranked in the order of S2-+ Cl-> SO42-+ S2-> SO42-+ Cl-.