摘要
采用化学浸泡法、电化学测试研究了冷弯加工前后轨道交通装备用国产301L高强不锈钢腐蚀行为,并对化学腐蚀和电化学腐蚀后样品的表面进行扫描电镜和能谱分析。化学浸泡法结果表明,冷弯后的国产301L高强不锈钢在50℃的6%(质量分数)FeCl_3溶液中浸泡72h后发生了明显的点蚀,腐蚀速率随时间的延长而迅速增大,72h后腐蚀速率达到128.5g/(m^2·h)。电化学测试结果表明,国产301L高强不锈钢经过冷弯加工后,在3.5%(质量分数)NaCl溶液中的点蚀电位下降365mV,钝化区宽度减小150mV,增加了点蚀敏感性。
Corrosion behaviors of domestic 301L high-strength stainless steel for railway transportation equipment before and after cold bending processing were studied by chemical immersion method and electrochemical test. Meanwhile,surfaces of the samples after chemical corrosion and electrochemical corrosion were analyzed by SEM and EDS.The results of chemical immersion method show that pitting corrosion occured evidently on cold bended do-mestic-made 301L high-strength stainless steel after immersing in 50 ℃ 6% （mass fraction）FeCl3 solution for 72 h, and the corrosion rate in FeCl3 solution increased with prolonging of time,and reached to 128.5 g/（m2 ·h）after 72 h.The results of electrochemical test show that after cold bending processing,the pitting potential of domestic 301L high-strength stainless steel in NaCl solution decreased by 365 mV,and the width of passivation region was re-duced by 150 mV,and the pitting sensitivity was enhanced.
出处
《中国冶金》
CAS
2015年第7期5-9,共5页
China Metallurgy
基金
江苏省产学研联合创新基金-前瞻性联合研究资助项目(BY2012019)
江苏省科技支撑计划-工业部分资助项目(BE2013124)
关键词
轨道交通装备用
国产
301L
高强不锈钢
化学浸泡法
电化学测试
railway transportation equipment
domestic
301L high-strength stainless steel
chemical immersion method
electrochemical test
