X80钢在碱性环境中的应力腐蚀行为
Stress Corrosion Cracking of X80 Steel in Alkaline Environment
摘 要
采用电化学测试、慢应变速率试验(SSRT)、扫描电镜(SEM)形貌分析等方法，研究了X80钢在模拟我国西北地区碱性土壤环境中的应力腐蚀行为，分析了外加阴极电位对应力腐蚀的影响。结果表明,X80钢在土壤模拟溶液中呈现出应力腐蚀敏感性; 外加电位对应力腐蚀有明显影响，在-850 mV(相对SCE)的阴极电位下，抑制了应力腐蚀; 而在-950 mV和-1 050 mV(相对SCE)条件下，阳极溶解和氢的联合作用影响应力腐蚀过程。同时，外加阴极电位越负，氢对应力腐蚀的影响越大。
应力腐蚀
碱性环境
X80 steel
stress corrosion cracking
alkaline environment
Abstract
The stress corrosion cracking (SCC) susceptibility of X80 steel in an alkaline soil environment was investigated using electrochemical polarization, slow strain rate testing (SSRT) and SEM. The effect of cathodic potential on SCC was studied. The results showed that X80 steel was susceptible to SCC in the present solution. The SCC behavior was affected by cathodic potentials obviously. The cathodic reaction restricted the SCC at the potential of -850 mV (vs.SCE). At more negative potentials of -950 mV and -1 050 mV (vs.SCE), the SCC behavior was controlled by the combined effect of anodic dissolution and hydrogen. When the cathodic potential was negatively shifted, the hydrogen played a more and more important role.
中图分类号 TG172.9
所属栏目 试验研究
基金项目
收稿日期 2014/4/1
修改稿日期
网络出版日期
作者单位点击查看
联系人作者孟旭(usameng@163.com)
备注孟旭(1986-),助理工程师,硕士,从事材料研究工作,
引用该论文: MENG Xu,XUE Dan,LI Qiang,YU Hong-ying. Stress Corrosion Cracking of X80 Steel in Alkaline Environment[J]. Corrosion & Protection, 2014, 35(6): 546
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参考文献
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【2】MANFREDI C,OTEGUI J L. Failures by SCC in buried pipelines［J］. Engineering Failure Analysis，2002，9:495-509.
【3】KENTISH P J. Gas pipeline failures:Australian experience［J］. Corrosion，1985，20(3): 139-146.
【4】CHENG Y F. Fundamentals of hydrogen evolution reaction and its implications on near-neutral pH stress corrosion cracking of pipelines［J］. Electrochimica Acta，2007，52(7): 2661-2667.
【5】方丙炎，王俭秋，朱自勇，等. 埋地管道在近中性pH和高pH环境中的应力腐蚀开裂［J］. 金属学报，2001，37(5): 453-458.
【6】GU B，LUO J L，MAO X. Hydrogen-facilitated anodic dissolution-type stress corrosion cracking of pipeline steels in near-neutral pH solution［J］. Corrosion，1999，55(1): 96-106.
【7】范林，刘智勇，杜翠薇，等. X80管线钢高pH应力腐蚀开裂机制与电位的关系［J］. 金属学报，2013，49(9): 689-698.
【8】ZHOU J L，LI X G，DU C W，et al. Anodic electrochemical behavior of X80 pipeline steel in NaHCO3 solution［J］. Acta Metallurgica Sinica，2010，46(2): 251-256.
【9】WANG J Q，ATRENS A. SCC initiation for X65 pipeline steel in the high pH carbonate/bicarbonate solution［J］. Corrosion Science，2003，45: 2199-2217.
【10】程远，俞宏英，王莹，等. 外加电位对X80钢在南雄土壤模拟溶液中应力腐蚀行为的影响［J］. 腐蚀与防护，2013，34(1): 13-17.
【11】孟旭，俞宏英，程远，等. X80管线钢在模拟樟树土壤溶液中的应力腐蚀敏感性［J］. 机械工程材料，2012，36(8): 13-17.
【12】LIANG P，LI X G，DU C W，et al. Stress corrosion cracking of X80 pipeline steel in simulated alkaline soil solution［J］. Materials and Design，2009，30(5): 1712-1717.
【13】梅华生，王长朋，张帷，等. 电化学充氢对X80管线钢在鹰潭土壤模拟溶液中应力腐蚀行为的影响［J］. 中国腐蚀与防护学报，2013，33(5): 389-394.
【14】PARKINS R N. Factors influencing stress corrosion crack growth kinetics［J］. Corrosion，1987，43(3): 130-139.
【15】LI M C，CHENG Y F. Mechanistic investigation of hydrogen-enhanced anodic dissolution of X-70 pipe steel and its implication on near-neutral pH SCC of pipelines［J］.Electrochimica Acta，2007，52: 8111-8117.
【16】CHU W Y，GU B，GAO K W. Corrosion-enhanced dislocation emission and motion resulting in initiation of stress corrosion cracking［J］. Science in China E，1997，40(1): 235-242.
【17】PARKINS R N，BLANCHARD W K，DELANTY B S. Transgranular stress corrosion cracking of high pressure pipelines in contact with solutions of near neutral pH［J］.Corrosion，1994，50(5): 394-408.
【18】HARLE B A，BEAVERS J A. Technical note: Low pH stress corrosion crack propagation in API X65 pipeline steel［J］.Corrosion，1993，49(10): 861-863.
【19】古特曼. 金属力学化学与腐蚀防护［M］.北京: 科学出版社，1989.
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