| 应力对X70钢在NaHCO3溶液中腐蚀行为的影响 |
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| 引用本文： | 陈旭,何川,刘硕,徐杨,吴明.应力对X70钢在NaHCO3溶液中腐蚀行为的影响[J].石油化工高等学校学报,2011(5):69-72. |
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| 作者姓名： | 陈旭 何川 刘硕 徐杨 吴明 |
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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;中国农业大学工学院; |
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| 基金项目： | 国家自然科学基金资助项目(50771053) |
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| 摘 要： | 采用电化学交流阻抗技术和显微微观观察研究了X70钢在0．5mol／LNaHCO3＋0．5mol／LNaCl溶液中的腐蚀行为。分析了外加应力水平对开路电位、极化电阻及表面形貌的影响。结果表明，在弹性载荷范围内，X70钢的耐蚀性下降。外加应力主要从两个方面促进了金属的腐蚀溶解：首先是在应力集中区域，原子排列发生形变，随着外加应力的增大，晶格缺陷增多，原子活化能提高，从而使平衡电位急剧下降；二是在应力集中区域，表面钝化膜发生不同程度的破坏或局部减薄，导致在钝化膜破裂或薄弱的位置上发生优先腐蚀并溶解。在外加应力和侵蚀性介质的共同作用下，X70钢表面的钝化膜破裂，试样局部塑性变形增加，导致局部电位发生变化，从而使其与周围基体形成了大阴极小阳极的腐蚀微电池，为点蚀形核创造了条件。
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| 关 键 词： | X70钢 应力 NaHCO3溶液 腐蚀 |
Effect of Stress on Corrosion Behaviors of X70 Steel in NaHCO_3 Solution |
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| CHEN Xu,HE Chuan,LIU Shuo,XU Yang,WU Ming.Effect of Stress on Corrosion Behaviors of X70 Steel in NaHCO_3 Solution[J].Journal of Petrochemical Universities,2011(5):69-72. |
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| Authors: | CHEN Xu HE Chuan LIU Shuo XU Yang WU Ming |
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| Affiliation: | CHEN Xu~1,HE Chuan~(2,1),LIU Shuo~1,XU Yang~(2*),WU Ming~1 (1.School of Petroleum Engineering,Liaoning Shihua University,Fushun Liaoning 113001,P.R.China,2.Collage of Engineering,China Agricultural University,Beijing 100083,P.R.China) |
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| Abstract: | Electrochemical impedance spectrum technology and morphology observing were used to study the corrosion behaviors of X70 pipeline steel in 0.5 mol/L NaHCO_3+0.5 mol/L NaCl solution.The results show that X70 steel corrosion resistant declined within the elastic load range.The metal corrosion was promoted by applied stress mainly due to two aspects: one is the atoms are arranged when deformed,lattice defects and atomic activation energy increased in the stress concentration area with the applied stress increa... |
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| Keywords: | X70 steel Stress NaHCO_3 solution Corrosion |
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