氯离子和硫离子对不锈钢侵蚀性比较  

Comparison of corrosion behavior on stainless steel between Cl and S ions

作　　者：解群[1] 翟祥华[1] 葛红花[1] 

机构地区：[1]上海电力学院,上海200090

出　　处：《华东电力》2003年第12期1-3,共3页East China Electric Power

基　　金：上海市教委青年基金资助项目 (项目编号 :0 3 0 Q 12 )

摘　　要：根据阳极极化曲线和电化学阻抗谱 ,比较了模拟冷却水中氯离子和硫离子对 3 1 6L不锈钢钝化膜耐蚀性能的影响。结果显示 ,氯离子的质量浓度大于一定值时使不锈钢在模拟冷却水中的点蚀电位降低 ,但在开路电位下自然形成钝化膜过程中电极阻抗值变化较小。硫离子使不锈钢钝化膜钝态电流显著增加 。Through anode polarization curve and electrochemical impedance chart,comparison between influences of Cl and S ions on corrosion-resistance performance of passive film on 316L stainless steel in simulated cooling water was conducted.The result showed that when the concentration of Cl ion exceeds 250 mg/L,the pitting potential of the stainless steel in the simulated cooling water drops.However,the electrode impedance of passive film formed at open circuit potential changes little.The rise of S ion concentration causes great increase of passive current of the passive film on stainless steel and the electrode impedance reduces.

关 键 词：凝汽器 氯离子 硫离子 不锈钢 侵蚀性 电化学阻抗谱 汽轮机 

分 类 号：TK264.11[动力工程及工程热物理—动力机械及工程]