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采用高温高压反应釜和电化学方法研究Cr含量对管线钢抗CO_2腐蚀性能的影响,并运用扫描电镜及能谱分析腐蚀产物膜形貌及成分.结果表明,管线钢添加少量的Cr元素可使其在CO_2腐蚀环境中形成结构致密的富Cr腐蚀产物膜,显著提高其抗CO_2腐蚀性能.随Cr含量提高,管线钢平均腐蚀速率下降,抗局部腐蚀能力提高;而且随Cr含量提高,管线钢自腐蚀电位向正方向偏移,极化电阻增大,抗CO_2腐蚀性能提高,与平均腐蚀速率分析结果一致.
The effects of Cr content on the corrosion resistance of pipeline steel against CO_2 were studied by high temperature and high pressure reactor and electrochemical methods. The morphology and composition of corrosion products were analyzed by SEM and EDS. The results showed that adding a small amount of Cr element Which formed a dense Cr-rich corrosion product film in CO 2 corrosion environment and significantly improved its resistance to CO 2 corrosion.With the increase of Cr content, the average corrosion rate of pipeline steel decreased and the resistance to localized corrosion increased. With the increase of Cr content, The self-corrosion potential shifts to the positive direction, the polarization resistance increases, and the anti-CO_2 corrosion performance improves, which is in agreement with the average corrosion rate analysis.