316不锈钢应力腐蚀的电化学噪声在线监测  

Online Monitoring of Electrochemical Noise of 316 Stainless Steel on Stress Corrosion

作　　者：叶一鸣[1] 胡石林[1] 刘海峰[2] 唐占梅[1] 张平柱[1] YE Yi-ming;HU Shi-lin;LIU Hai-feng;TANG Zhan-mei;ZHANG Ping-zhu(China Institute of Atomic Energy,Beijing 102413,Ghina;Wuhan Research Institute of Materials Protection,Wuhan 430030,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]武汉材料保护研究所,湖北武汉430030

出　　处：《材料保护》2018年第8期65-68,共4页Materials Protection

摘　　要：为了评价腐蚀过程中监测到的电化学噪声与金属材料腐蚀行为之间的关系,采用应力腐蚀试验和慢应变速率拉伸试验研究了316不锈钢在沸腾的42%氯化镁溶液以及260℃下Cl-浓度为10 mg/L的溶液中的应力腐蚀行为,连续测得了腐蚀过程中的电化学噪声并对其进行了分析讨论。结果表明:前者的噪声电流先快速上升后缓慢下降呈阶梯状,类似于1种噪声脉冲信号;后者发生应力腐蚀时的电化学噪声表现为强的信号峰。慢应变速率拉伸试验不同阶段的电化学噪声特征与应力-应变曲线相对应。In order to evaluate the relationship between the electrochemical noise and corrosion bebaviors, the stress corrosion test aod slow strain rate tension test （SSRT） were used to study the stress corrosion behaviors of 316 stainless steel in boiling 42% magnesium chloride and 10 mg/l. chloride ion aqueous solution at 260℃. The electrochemical potential and current noise of stress corrosion during the corrosion process were measured and analyzed. Results showed that the electrochemical current noise of the former test did seem to be a pulse signal, which arose quickly as a line and then declined slowly forming a stair-step shape. The electrochemical noise of the latter test was recorded as a strong signal during stress corrosion process. Moreover, the feature of electrochemical noise of stress corrosion during the slow strain rate test had a good accordance with the stress-strain curve.

关 键 词：电化学噪声 应力腐蚀开裂 慢应变速率拉伸 316不锈钢 

分 类 号：TG172[金属学及工艺—金属表面处理]