X70管线钢在近中性及高pH值溶液中的电化学行为和SCC敏感性
ELECTROCHEMICAL BEHAVIOUR AND SCC SUSCEPTIBILITY OF PIPELINE STEEL X70 IN NEAR-NEUTRAL AND HIGH pH SOLUTIONS
摘 要
采用动电位极化曲线测试法研究了温度、通气条件和pH值对X70管线钢在NS4溶液和0.5 mol/L Na2CO3＋1 mol/L NaHCO3溶液中的电化学极化行为的影响,并用慢应变速率试验(SSRT)研究了X70管线钢在这些溶液中的应力腐蚀破裂(SCC)敏感性.结果表明,X70管线钢在NS4溶液中不出现活化—钝化转变区,随外加电位负移, SCC敏感性增加,表现出氢致破裂(HIC)的特征；在0.5 mol/L Na2CO3＋1 mol/L NaHCO3高pH值溶液中出现活化—钝化转变区,在阴极极化区,也表现出氢致破裂(HIC)的特征,但在阳极极化区,发生的是阳极溶解型应力腐蚀破裂(ADSCC).
近中性溶液
高pH值溶液
电化学行为
SCC敏感性
Pipeline steel
High-pH solution
NS4 solution
Electrochemical behavior
SCC susceptibility
Abstract
The influence of temperature,aerated condition and pH value on the electrochemical behavior and stress corrosion cracking(SCC) susceptibility of X70 pipeline steel in NS4 solution and 0.5 mol/L Na2CO3+1 mol/L NaHCO3 solution was investigated using potentiodynamic polarization measurements and slow strain rate tests(SSRT).In NS4 solution,active-passive transition behavior did not appear and SCC susceptibility increased with the negative movement of applied potential,indicating character of hydrogen induced cracking(HIC).In 0.5 mol/L Na2CO3+1 mol/L NaHCO3 solution,active-passive transition behavior was found in the potentiodynamic polarization curves,character of hydrogen induced cracking(HIC) was shown in cathodic polarization region and anodic dissolution SCC(ADSCC) occurred in anodic polarization region.
中图分类号 TG172.6
所属栏目 试验研究
基金项目 国家重点基础研究专项经费(G19990650)、上海市科技发展基金项目(025258036)、上海市自然科学基金(02ZE14031)资助
收稿日期 2006/7/4
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引用该论文: ZHOU Jian-jiang,LIU Xing,LI Guang-fu,GUO Hao,YANG Wu. ELECTROCHEMICAL BEHAVIOUR AND SCC SUSCEPTIBILITY OF PIPELINE STEEL X70 IN NEAR-NEUTRAL AND HIGH pH SOLUTIONS[J]. Corrosion & Protection, 2007, 28(1): 1～5
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参考文献
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【6】Parkins R N.Predictive approaches to stress corrosion cracking failure[J].Corrosion Science,1980,20(5):151-157.
【7】Sutcliffe J M,Fessler R R,Boyd W K,et al.Stress corrosion cracking of carbon steel in carbonate solutions[J].Corrosion,1972,28(8):313-320.
【2】National Energy Board (NEB),Public inquiry concerning stress corrosion cracking on canadian oil and gas pipelines[G]//NEB Report Mh-2-95,Calgary,AB,Canada:1996.
【3】King F,Boven G V,Jack T,et al.Predicting the growth of low-and high pH SCC on gas transmission pipelines based on operating conditions[G]// Proceeding of the CORROSION/2003 Research Topical Symposium:Modeling and Prediction of Lifetimes for Corrodible Structure.Houston:NACE international,2003:127-155.
【4】J A Beavers,Carolyn L Durr,Burke S Delanty.High-pH SCC:temperature and potential dependence for cracking in field environments[G]// ASME International Pipeline Conference-Volume 1,1998.
【5】Charles E A,Parkins R N.Generation of stress corrosion cracking environments at pipeline surface[J].Corrosion,1995,51(7):518-527.
【6】Parkins R N.Predictive approaches to stress corrosion cracking failure[J].Corrosion Science,1980,20(5):151-157.
【7】Sutcliffe J M,Fessler R R,Boyd W K,et al.Stress corrosion cracking of carbon steel in carbonate solutions[J].Corrosion,1972,28(8):313-320.
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