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

腐蚀与防护, 2007, 28(1): 1-5. doi: 10.3969/j.issn.1005-748X.2007.01.001

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

周建江 ^1, , 刘杏 ^2, , 李光福 ^3, , 郭浩 ^4, , 杨武 ^5,

1.上海材料研究所,上海,200437

2.上海材料研究所,上海,200437

3.上海材料研究所,上海,200437

4.上海材料研究所,上海,200437;上海交通大学材料科学与工程学院,上海,200030

5.上海材料研究所,上海,200437

基金项目: 上海市自然科学基金(02ZE14031) 上海市科技发展基金(025258036) 国家重点基础研究发展计划(973计划)(G19990650)

关键词：管线钢 , 近中性溶液 , 高pH值溶液 , 电化学行为 , SCC敏感性

ELECTROCHEMICAL BEHAVIOUR AND SCC SUSCEPTIBILITY OF PIPELINE STEEL X70 IN NEAR-NEUTRAL AND HIGH pH SOLUTIONS

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).

参考文献

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