Effects of Test Conditions on Measurement of Pitting Potential of Stainless Steels by Using Potential Dynamic Polarization Curve
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。
Abstract
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 304L 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.
中图分类号 TG174 DOI 10.11973/fsyfh-202109002
所属栏目 试验研究
基金项目 上海材料研究所所管项目(20181302)
收稿日期 2020/12/7
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引用该论文: JI Kaiqiang,HE Zhaoru,YAN Xiaobo,LI Guangfu. Effects of Test Conditions on Measurement of Pitting Potential of Stainless Steels by Using Potential Dynamic Polarization Curve[J]. Corrosion & Protection, 2021, 42(9): 7
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参考文献
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【2】ANOOP M B,BALAJI RAO K,LAKSHMANAN N. Safety assessment of austenitic steel nuclear power plant pipelines against stress corrosion cracking in the presence of hybrid uncertainties[J]. International Journal of Pressure Vessels and Piping,2008,85(4):238-247.
【3】HOMONNAY Z,KUZMANN E,VARGA K,et al. Comprehensive investigation of the corrosion state of the heat exchanger tubes of steam generators.Part Ⅱ.Chemical composition and structure of tube surfaces[J]. Journal of Nuclear Materials,2006,348(1/2):191-204.
【4】李劲,蒋益明. 不锈钢腐蚀评价技术研究及其应用[C]//2010年全国腐蚀电化学及测试方法学术会议论文集. 杭州:[s.n.],2010.
【5】赵迪,李光福,纪开强,等. 304L/ER316L奥氏体不锈钢焊接板的点蚀行为[J]. 腐蚀与防护,2020,41(1):1-8,46.
【6】赵迪,李光福,纪开强,等. 乏燃料池用S32101/ER2209双相不锈钢焊接板的点蚀行为[J]. 腐蚀与防护,2019,40(12):861-870.
【7】金玉婷,纪开强,胡俊,等. 环境因素对两种不锈钢在模拟海水中点蚀行为的影响[J]. 腐蚀与防护,2018,39(9):663-667,672.
【8】段传成,程从前,赵杰. 电位扫描速率对测试304不锈钢腐蚀行为的影响[J]. 腐蚀与防护,2013,34(3):197-199.
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