摘要
利用动电位极化曲线、电化学阻抗谱和电流-时间响应曲线对高氮钢在不同pH值NaCl溶液中的电化学行为进行了研究。结果表明,高氮钢在酸性NaCl溶液中处于非稳定状态,出现3个自腐蚀电位,在碱性NaCl中发生阳极钝化,腐蚀速率随溶液pH值的增加而降低;在阳极极化条件下,高氮钢在中性NaCl溶液中生成的膜疏松多孔,对基体的保护性较差;而酸性和碱性NaCl溶液中,生成的钝化膜比中性NaCl中的致密。H+和OH-参与了钝化膜的成膜过程。
The electrochemical behavior of high nitrogen stainless steel （HNS） in 1 mol/L NaC1 so- lution with different pH values was investigated by means of potentiodynamic polarization curves, electrochemical impendence spectrum and current-time transient curves. The results show that an- odic passivation of HNS could occur in alkaline solutions, while the corrosion rate of HNS de- creased with the increasing pH value; a porous film might be grown on HNS in neutral NaC1 solu- tion due to the companying processes of dissolution and repassivation. In acidic and alkaline NaC1 solutions, the formed passive films on HNS exhibit superior protectiveness rather than that in neu- tral NaC1 solution.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2014年第2期132-136,共5页
Corrosion Science and Protection Technology
关键词
腐蚀
电化学
高氮钢
钝化
corrosion, electrochemical, high nitrogen stainless steel, passivation
