温度对X80管线钢酸性红壤腐蚀行为的影响  

Effect of Temperature on Corrosion Behavior of X80 Pipeline Steel in Acidic Soil

作　　者：杨霜[1,2] 唐囡[3] 闫茂成[1] 赵康文 孙成[1] 许进[1] 于长坤[1] 

机构地区：[1]中国科学院金属研究所国家金属腐蚀控制工程技术研究中心,沈阳110016 [2]沈阳理工大学环境与化学工程学院,沈阳110016 [3]国网江西省电力科学研究院,南昌330096

出　　处：《中国腐蚀与防护学报》2015年第3期227-232,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金重点项目(51131001);国家电网科技项目(521820130014);教育部留学回国人员科研启动基金项目资助

摘　　要：使用电化学阻抗谱(EIS)研究X80管线钢在不同温度酸性红壤中的腐蚀行为,应用动力学和过渡态理论分析X80管线钢腐蚀过程的反应动力学特征。结果表明,X80钢在红壤中的EIS由高频区的土壤容抗弧和低频区的界面过程容抗弧组成。环境温度对X80钢红壤腐蚀影响显著:随温度的升高,土壤电阻和电荷转移电阻均呈减小趋势,腐蚀速率增大。反应动力学分析表明,X80钢在酸性红壤中的腐蚀是体系混乱度减小的吸热反应。Corrosion of X80 pipeline steel in an acidic red soil collected from Yingtan area of Southeast China was studied in a temperature range 20~75 ℃ by electrochemical impedance spectroscopy(EIS). Theory concerning corrosion dynamics and transition state was applied to analyze the process and kinetics of the corrosion reaction. The results show that EIS of X80 steel in the red soil contains a capacitive arc related with soil at the high frequency region and a capacitive arc from the interface process at low frequency region. With increasing temperature, the soil resistivity and charge transfer resistance decrease, and the corrosion rate increases. Kinetics analysis shows that corrosion of X80 steel in the acidic red soil is an endothermic reaction system companied with decrease of disorder degree.

关 键 词：管线钢 阴极保护 酸性土壤 EIS 动力学分析 

分 类 号：TG174.3[金属学及工艺—金属表面处理]