摘要
利用极化曲线、化学浸泡和电化学阻抗测试等方法研究了固溶温度对超级奥氏体不锈钢00Cr20Ni25Mo6Cu3耐点腐蚀性能的影响。并借助金相显微镜（OM）分析了热处理后的组织形貌。结果表明,随着固溶温度的升高,第二相逐渐溶于基体,晶粒也明显长大;腐蚀失重率先降低后增加,在1 200℃时达到最小;交流阻抗谱圆弧半径先增大后减小,即材料耐腐蚀性能先增强后减弱。第二相是导致00Cr20Ni25Mo6Cu3不锈钢耐腐蚀性能下降的主要原因。
The effect of solution temperature on pitting resistance of superaustenitic stainless steels 20 Cr-25 Ni-6 Mo in concentrated chloride media was studied by potentiodynamic scanning（PDS）,chemical immersion test and electrochemical impedance spectroscopy（EIS）.The microstructure of the alloy after heat treatment was observed by optical microscope（OM）.The results show that with the increase of solution temperature,the secondary phases dissolve in the matrix,the grain grows significantly.The rate of weight loss decreases first,and reaches the minimum at 1 200℃,and thereafter,it increases with further increasing solution temperature.Meanwhile,the radius of the EIS capacitive loop increases first and then reduces,signifying that the corrosion resistance of the stainless steels is first enhanced and then weakened.The deterioration of the corrosion resistance of the stainless steel is attributed to the presence of secondary phases.
作者
沈文兴
陈海涛
郎宇平
浦恩祥
周晓玲
SHEN Wen-xing;CHEN Hai-tao;LANG Yu-ping;PU En-xiang;ZHOU Xiao-ling(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2018年第9期741-746,共6页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(2016YFB 0300207)
关键词
超级奥氏体不锈钢
热处理
点蚀电位
极化曲线
交流阻抗
superaustenitic stainless steel
heat treatment
pitting potential
polarization curve
EIS
