摘要
为了探究高氮奥氏体不锈钢在不同腐蚀介质环境中的点蚀发展特征,为材料的安全长久服役提供理论支持,采用金相显微镜、扫描电镜(SEM)、动电位极化曲线方法和电化学阻抗谱研究了1 100℃固溶30 min、800℃敏化4 h处理的敏化态高氮奥氏体不锈钢在不同pH值和Cl^-浓度的NaCl溶液中的点蚀敏感性,分析不同介质条件下奥氏体不锈钢点蚀的电化学特征。结果表明:敏化处理后试样的显微组织为奥氏体,晶界上有析出物;随着NaCl溶液浓度增加,不锈钢的耐点蚀敏感性降低,随着NaCl溶液pH值的增加,不锈钢的耐点蚀敏感性升高。
In order to explore the development of pitting resistance of high-nitrogen austenitic stainless steel in different corrosive media,the OM,SEM,potentiodynamic polarization and EIS were used to study the pitting sensitivity of the stainless steel treated at 1 100 ℃ for 30 min and then at 800 ℃ for 4 h in NaCl solution with different pH values and Cl^- concentrations and the electrochemical behavior under different media conditions. Results indicated that the microstructure of the samples after sensitization treatment was austenite and there were precipitates on the grain boundary. The pitting sensitivity of the stainless steel decreased with the increase of the concentration of NaCl solution,whereas increased with the increase of pH value.
作者
周文倩
韩成府
孙玉福
ZHOU Wen-qian;HAN Cheng-fu;SUN Yu-fu(Xinlian College of Henan Normal University,Zhengzhou 450000,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China)
出处
《材料保护》
CAS
CSCD
北大核心
2018年第12期132-135,142,共5页
Materials Protection
关键词
奥氏体不锈钢
点蚀
电化学阻抗谱
动电位扫描
austenitic stainless steel
pitting corrosion
electrochemical impedance
potentiodynamic polarization
