试验条件对动电位极化曲线测量不锈钢点蚀电位的影响  

Effects of Test Conditions on Measurement of Pitting Potential of Stainless Steels by Using Potential Dynamic Polarization Curve

作　　者：纪开强 何兆如 闫晓波 李光福[1] JI Kaiqiang;HE Zhaoru;YAN Xiaobo;LI Guangfu(Shanghai Key Laboratory of Engineering Materials Application and Evaluation,Shanghai Research Institute of Materials,Shanghai 200437,China)

机构地区：[1]上海材料研究所上海市工程材料应用与评价重点实验室,上海200437

出　　处：《腐蚀与防护》2021年第9期7-10,60,共5页Corrosion & Protection

基　　金：上海材料研究所所管项目(20181302)。

摘　　要：基于国内外常用不锈钢点蚀电位的测试标准,采用动电位极化曲线测量法,研究了最终打磨后的停留时间、电位扫描速率和溶液预除氧时间等测试条件对304L奥氏体不锈钢和S32101双相不锈钢在3.5%NaCl溶液中自腐蚀电位(Ecorr)和点蚀电位的影响。结果表明:最终打磨后停留时间由0 h延长至24 h,两种钢的Ecorr显著提高,点蚀电位也有所升高;电位扫描速率由10 mV/min提升至20 mV/min后,两种钢的点蚀电位变化不明显;溶液预除氧时间由0.5 h提升至1 h时,两种钢的Ecorr降低、点蚀电位升高。Based on the commonly used stainless steel pitting corrosion potential test standards at home and abroad, using the potentiodynamic polarization curve measurement method, the effects of residence time after final polishing, potential scan rate and solution pre-deoxidation time on the self-corrosion potential(Ecorr) and pitting potential of 304 L austenitic stainless steel and S32101 duplex stainless steel in 3.5% NaCl solution were studied. The results showed that when the residence time after final polishing was extended from 0 h to 24 h, Ecorr of two kinds of steel was significantly increased, and the pitting corrosion potential was also increased. After potential scanning rate was increased from 10 mV/min to 20 mV/min, the change of pitting corrosion potential of two kinds of steel was not obvious. When solution pre-deoxygenation time was increased from 0.5 h to 1 h, Ecorr of two kinds of steel was decreased and pitting potential was increased.

关 键 词：不锈钢 点蚀 动电位极化曲线 电位扫描速率 

分 类 号：TG174[金属学及工艺—金属表面处理]