外加电位对X80管线钢在库尔勒土壤模拟溶液中应力腐蚀行为的影响
Effect of Applied Potential on Stress Corrosion Behaviors of X80 Pipeline
肖 军, 吴 明, 陈 旭, 王成祥
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作者单位：辽宁石油化工大学 石油天然气工程学院, 辽宁 抚顺 113001
中文关键字：X80管线钢； 模拟溶液； 应力腐蚀开裂； 外加电位
英文关键字：X80 pipeline steels; simulated solution; SCC; applied potential
中文摘要：采用动电位扫描方法和慢应变速率拉伸试验(SSRT)研究了X80管线钢在库尔勒土壤模拟溶液中的应力腐蚀行为，并用扫描电镜观察分析了不同外加电位下的断口形貌。 结果表明，X80管线钢在库尔勒土壤模拟溶液中的极化曲线具有典型的活性溶解特征。随外加电位的负移，X80管线钢的应力腐蚀敏感性明显增加。阴极极化条件下，X80管线钢在库尔勒土壤模拟溶液中的SCC的开裂机制为氢致破裂(HIC)。
英文摘要：The stress corrosion cracking (SCC) behavior of X80 pipeline steels joint in Ku'erle soil simulated solution was studied using otentiodynamic polarization technique and slow strain rate testing. Fracture surfaces were observed by SEM observation under different applied potential condition. The results show that the polarization curves of X80 pipeline steel have typical characteristics of active dissolution in Ku'erle soil simulated solution. With the negative moving of cathodic polarization potential, the SCC sensitivity obviously increases. The SCC mechanism of X80 pipeline steels in Ku'erle soil simulated solution is hydrogen induced cracking.