SO2-4对X80管线钢在含Cl-的NaHCO3溶液中点蚀行为影响
Effect of SO2-4 on Pitting Corrosion Behavior of X80 Pipeline Steel in NaHCO3 Solution Containing Cl-
摘 要
通过动电位极化方法研究了SO2-4对X80管线钢在含0.01 mol/L NaCl的0.5 mol/L NaHCO3溶液中点蚀行为的影响,并通过电容测量方法对其机理进行了研究.结果表明:当溶液中SO2-4和Cl-共存时,随着SO2-4浓度的增大,点蚀电位降低,点蚀数量增加,X80钢发生点蚀的倾向性增大.这主要是因为吸附在试样表面的SO2-4增加了X80钢表面钝化膜内的缺陷数量,从而增加了点蚀萌生的位置和几率.
SO2-4
Cl-
点蚀
X80 pipeline steel
SO2-4
Cl-
pitting corrosion
Abstract
Effect of SO2-4 on the pitting corrosion behavior of X80 pipeline steel has been investigated in 0.5 mol/L NaHCO3 solution containing 0.01 mol/L NaCl by potentiodynamic polarization experiment,and the mechanism was discussed based on capacitance measurements technique.The potentiodynamic polarization curves showed that the values of pitting potential (Epit) reduced and number of pitting corrosion increased after adding SO2-4.The reason was the increase of defects due to the adsorption of SO2-4 on X80 steel surface,and the pitting initiation sites and occurrence probability were enhanced.
中图分类号 TG172.6
所属栏目 试验研究
基金项目
收稿日期 2009/9/14
修改稿日期 2009/11/9
网络出版日期
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引用该论文: LIANG Ping,DU Cui-wei,LI Xiao-gang. Effect of SO2-4 on Pitting Corrosion Behavior of X80 Pipeline Steel in NaHCO3 Solution Containing Cl-[J]. Corrosion & Protection, 2010, 31(5): 362～364
被引情况:
【1】黄敦伟,胡爱萍,孔德军,张宏伟, "X70管线钢盐雾腐蚀性能",腐蚀与防护 35, 69-73(2014)
【2】张淑雁,梁平,胡传顺,秦华, "库尔勒土壤中阴离子对X80管线钢腐蚀行为的影响",腐蚀与防护 35, 14-17(2014)
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参考文献
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【2】Lee W J,Pyun S I.Effects of sulphate ion additives on the pitting corrosion of pure aluminium in 0.01 M NaCl solution[J].Electrochimica Acta,2000,45(12):1901-1910.
【3】Moayed M H,Newman R C.Aggressive effects of pitting “inhibitors” on highly alloyed stainless steels[J].Corrosion Science,1998,40(2/3):519-522.
【4】Díez-Pérez I,Vericat C,Gorostiza P,et al.The iron passive film breakdown in chloride media may be mediated by transient chloride-induced surface states located within the band gap[J].Electrochemistry Communications,2006,8(4):627-632.
【5】Ningshen S,Kamachi Mudali U,Mittal V K,et al.Semiconducting and passive film properties of nitrogen-containing type 316LN stainless steels[J].Corrosion Science,2007,49(2):481-496.
【6】梁平,李晓刚,杜翠薇,等.Cl-对X80管线钢在NaHCO3溶液中腐蚀性能的影响[J].北京科技大学学报,2008,30(7):735-739.
【7】Pagitsas M,Diamantpoulou A,Sazou D.Distinction between general and pitting corrosion based on the nonlinear dynamical response of passive iron surfaces perturbed chemically by halides[J].Electrochemistry Communications,2001,3(7):330-335.
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