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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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X65钢在含超临界CO2的NaCl溶液中腐蚀机制的讨论*
DOI: 10.11900/0412.1961.2014.00491, PP. 701-712
Keywords: CO2腐蚀,超临界CO2,X65钢,Cl-,腐蚀机制
Abstract:
利用高温高压反应釜研究了X65管线钢在含有超临界CO2(supercriticalCO2,SCCO2)的3.5%NaCl溶液、去离子水以及溶解有NaCl溶液的超临界CO2相中的腐蚀行为.结果表明,Cl-的存在导致X65钢在含有饱和SCCO2的NaCl溶液中的腐蚀速率显著升高,腐蚀产物膜的晶粒形貌发生改变.X65钢在超临界CO2相中的腐蚀速率远远低于在NaCl溶液中的腐蚀速率,但出现局部腐蚀.X65钢在含有SCCO2的NaCl溶液中的腐蚀分为3个阶段第一个阶段为基体快速溶解阶段,表面没有FeCO3生成;第二阶段为FeCO3开始沉积阶段,形成的FeCO3腐蚀产物膜不完整,增大了阴极还原反应面积,导致腐蚀加速;第三阶段为腐蚀产物膜保护阶段,形成的腐蚀产物膜致密性逐渐提高,保护性好,但Cl-仍然可以穿过腐蚀产物膜到达膜基界面,从而加速钢的腐蚀.建立了普通管线钢在含Cl-溶液中的超临界CO2腐蚀模型.
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