电极电位和温度对X70钢在高pH值模拟土壤环境中应力腐蚀破裂的影响
EFFECT OF ELECTRODE POTENTIAL AND TEMPERATURE ON STRESS CORROSION CRACKING OF PIPELINE STEEL X70 IN HIGH pH SOLUTIONS
摘 要
采用慢应变速率拉伸试验(SSRT)方法研究了温度(30～65 ℃范围)和电极电位(-1500～-200 mV(SCE)范围)对X70管线钢在0.5 mol/L Na2CO3+1 mol/L NaHCO3的高pH模拟土壤溶液中应力腐蚀破裂(SCC)行为的影响.结果表明:在阳极极化区,温度对该钢的SCC敏感性影响不大,在阴极极化区,SCC敏感性随温度升高而下降; 在所研究的电位区间,SCC敏感性随着电极电位的降低而增大;SCC机理分析表明,当电位E>EH(溶液中H+/H2的平衡电位)时,应该是阳极溶解占主导,而当E≤EH时,氢致破裂占主导.
高pH应力腐蚀破裂
电极电位
温度
Pipeline steel
High pH stress corrosion cracking
Electrode potential
Temperature
Abstract
The behaviors of high pH stress corrosion cracking(SCC)of pipeline steel X70 in 0.5mol/L Na2CO3+1 mol/L NaHCO3 solution were studied by means of slow strain rate tests (SSRT) at different temperatures in the range from 30 ℃ to 65 ℃ and different electrode potentials from -1500 to -200 mV(SCE).The temperature had no apparent effect on SCC susceptibility of the steel in anodic polarization range,but the SCC susceptibility increased with the rise of temperature in cathodic polarization range.The SCC susceptibility of the steel increased generally with decreasing the potential.When potential E≤EH,the equilibrium potential for hydrogen discharge (H2＝2H+＋2e) in the solution,it should be hydrogen induced cracking (HIC) which dominates the cracking process.On the contrary,anodic dissolution should dominate the cracking process when E>EH.
中图分类号 TG172.9
所属栏目 试验研究
基金项目 本工作得到上海市科学技术委员会项目资助(05dz22316)和国家重点基础研究专项经费资助(G19990650)
收稿日期 2007/5/24
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引用该论文: ZHANG Guo-liang,LI Guang-fu,ZHOU Jian-jiang,HUANG Chun-bo,YANG Wu. EFFECT OF ELECTRODE POTENTIAL AND TEMPERATURE ON STRESS CORROSION CRACKING OF PIPELINE STEEL X70 IN HIGH pH SOLUTIONS[J]. Corrosion & Protection, 2007, 28(9): 437～441
被引情况:
【1】王霞,王飞,张鹏, "不同温度下X80钢在高pH土壤模拟溶液中的腐蚀电化学行为",腐蚀与防护 34, 287-290(2013)
【2】李光福,杨武, "埋地重要管线的腐蚀与防护",腐蚀与防护 30, 620-630(2009)
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参考文献
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【4】郭浩,李光福,蔡 珣,等.X70管线钢在不同温度近中性pH溶液中的应力腐蚀破裂行为[J].金属学报,2004,40(9):967-971.
【5】王燕斌,王胜,颜练武.塑性变形在氢致断裂中的作用[J].中国腐蚀与防护学报,2000,20(4):248-252.
【6】Wu YANG,Guangfu LI,Hao GUO,et al.Effects of environmental factors on stress corrosion cracking of pipeline steels[J].J Key Engineering Materials,2005,297-300:Part 2,939-944.
【2】Parkins R N.A review of stress corrosion cracking of high pressure gas pipeline[C]//Corrosion,2000:363.
【3】闫茂成,翁永基.温度和应力对管道钢应力腐蚀过程电化学行为的影响[J].石油工程建设,2004,30(3):4-7.
【4】郭浩,李光福,蔡 珣,等.X70管线钢在不同温度近中性pH溶液中的应力腐蚀破裂行为[J].金属学报,2004,40(9):967-971.
【5】王燕斌,王胜,颜练武.塑性变形在氢致断裂中的作用[J].中国腐蚀与防护学报,2000,20(4):248-252.
【6】Wu YANG,Guangfu LI,Hao GUO,et al.Effects of environmental factors on stress corrosion cracking of pipeline steels[J].J Key Engineering Materials,2005,297-300:Part 2,939-944.
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