| 外加电位对X70管线钢在库尔勒土壤模拟溶液中应力腐蚀开裂敏感性的影响 |
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| 引用本文： | 张亮,李晓刚,杜翠薇,梁平.外加电位对X70管线钢在库尔勒土壤模拟溶液中应力腐蚀开裂敏感性的影响[J].中国腐蚀与防护学报,2009,29(5). |
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| 作者姓名： | 张亮 李晓刚 杜翠薇 梁平 |
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| 作者单位： | 北京科技大学材料科学与工程学院腐蚀与防护中心,北京,100083 |
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| 基金项目： | 国家十一五科技支撑计划，国家科技基础条件平台建设项目 |
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| 摘 要： | 采用慢应变速率拉仲试验(SSRT)研究了不同外加电位下X70管线钢在库尔勒土壤模拟溶液中的应力腐蚀开裂(SCC)行为,并用扫描电镜分析了不同电位下的断面形貌.结果表明,X70管线钢在库尔勒土壤模拟溶液中具有SCC敏感性;在Ecorr附近施加弱极化时,应力腐蚀开裂敏感性增加;施加强阳极电位时,发生强烈阳极溶解,导致阳极溶解断裂;施加强阴极电位时,析氢过程加强,导致氢致应力腐蚀断裂.
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| 关 键 词： | X70管线钢 应力腐蚀开裂 模拟溶液 电位 |
EFFECT OF APPLIED POTENTIALS ON STRESS CORROSION CRACKING OF X70 PIPELINE STEEL IN SIMULATED KU'ERLE SOIL SOLUTION |
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| ZHANG Liang,LI Xiaogang,DU Cuiwei,LIANG Ping.EFFECT OF APPLIED POTENTIALS ON STRESS CORROSION CRACKING OF X70 PIPELINE STEEL IN SIMULATED KU'ERLE SOIL SOLUTION[J].Journal of Chinese Society For Corrosion and Protection,2009,29(5). |
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| Authors: | ZHANG Liang LI Xiaogang DU Cuiwei LIANG Ping |
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| Abstract: | Stress corrosion cracking (SCC) behavior of X70 pipeline steel in simulated Ku'erle soil solution at different applied potentials was investigated using slow strain rate testing (SSRT). Morphology of X70 pipeline steel fracture surface at different applied potentials was observed by scanning electron microscope (SEM). The results showed that X70 pipeline steel was susceptible to SCC in simulated solutions. It was found that low potentials applied increased susceptibility to SCC at open circuit potential (OCP). The fracture mechanism followed anodic dissolution mechanism of SCC. The precipitation of hydrogen increased hydrogen diffusion into the metal, hence increased susceptibility to SCC under higher cathode potential in simulated solution. The fracture followed hydrogen induced cracking mechanism. |
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| Keywords: | X70 pipeline steel stress corrosion cracking simulated solution potentialX70 pipeline steel stress corrosion cracking simulated solution potential |
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