电位扫描速率对电极过程动力学参数测试结果的影响
Effects of Potential Scanning Rate on Testing Results of Kinetic Parameters of Electrode Reaction
摘 要
采用动电位极化测量技术测量了316L不锈钢在0.1 mol/L NaCl水溶液中不同电位扫描速率下的极化曲线,采用Tafel直线外推法、线性极化法和弱极化区极化曲线法测定了金属的腐蚀电流密度.试验结果表明,在该溶液中316L不锈钢动电位极化曲线中的零电流电位随着电位扫描速率的增大而逐渐负移.理论推导和试验验证表明,腐蚀电流密度与电位扫描速率的平方根呈线性关系,并且电位扫描速率对利用Tafel直线外推法、线性极化法和弱极化区极化曲线法测定的腐蚀电流密度的影响不同.
电位扫描速率
腐蚀电流密度
不锈钢
零电流电位
potentiodynamic polarization
potential scanning rate
corrosion current density
stainless steel
zero current potential
Abstract
Polarization curves of 316L stainless steel in 0.1 mol/L NaCl solution were measured at different potential scanning rates.The corrosion current density was measured by three methods,including tafel line extrapolation method,linear polarization method and weak polarization method.The results showed that the corrosion potential negatively moved with the increase of scanning rate.The corrosion current density had a linear relationship with the square root of the potential scanning rate.The potential scanning rate had different influence on the test results of the three measurement methods.
中图分类号 TG174.3+6
所属栏目 试验研究
基金项目 国家自然科学基金项目(50971016);国家科技基础条件平台建设项目(2005DKA10400)
收稿日期 2010/1/15
修改稿日期 2010/1/28
网络出版日期
作者单位点击查看
备注李晓刚,教授,博士生导师.
引用该论文: JIA Zhi-jun,LI Xiao-gang,DU Cui-wei. Effects of Potential Scanning Rate on Testing Results of Kinetic Parameters of Electrode Reaction[J]. Corrosion & Protection, 2010, 31(11): 829～832
被引情况:
【1】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",腐蚀与防护 34, 197-199(2013)
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参考文献
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【2】聂向晖,杜翠薇,李晓刚.用等距离电位法修正Q345钢在稀NaHCO3溶液中极化曲线[J].中国腐蚀与防护学报,2009,29(3):167-171.
【3】姜应律,吴荫顺.用极化曲线研究钛合金在水,醇中腐蚀机理的差异[J].腐蚀科学与防护技术,2005,17(3):154-158.
【4】董超芳,李晓刚,武俊伟,等.土壤腐蚀的实验研究数据处理[J].腐蚀科学与防护技术,2003,15(3):154-160.
【5】Poursaee A.Determining the appropriate scan rate to perform cyclic polarization test on the steel bars in concrete[J].Electrochim Acta,2010,55(3):1200-1206.
【6】Zhang X L,Jiang Z H,Yao Z P,et al.Effect of scan rate on the potentiodynamic polarization curve obtained to determine the Tafel slopes and corrosion current density[J].Corro Sci ,2009,51(2):581-587.
【7】Rees N V,Klymenko O V,Coles B A,et al.Fast scan linear sweep voltammetry at a high-speed wall-tube electrode[J].J Electroanaly Chem,2003,557(1):99-107.
【8】Haruna T,Macdonald D D.Theoretical prediction of the scan rate dependencies of the pitting potential and the probability distribution in the induction time[J].J Electrochem Soc,1997,144(5):1574-1581.
【9】Trnková L.Indentification of current nature by elimination voltammetry with linear scan[J].J Electroanaly Chem.,2005,582(2):258-266.
【10】田昭武.电化学研究方法[M].北京:科学出版社,1984.
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