X80管线钢焊接热影响区在含S^(2-)介质中的耐蚀性分析  

Corrosion resistance of X80 pipeline steel heat-affected zone in S^(2-)medium

作　　者：毕宗岳[1,2] 雷阿利[1] 王娜[1] 冯拉俊[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048 [2]宝鸡石油钢管有限责任公司,陕西宝鸡721008

出　　处：《焊接学报》2009年第10期89-92,共4页Transactions of The China Welding Institution

基　　金：陕西省腐蚀与防护重点实验室项目资助(2006B22)

摘　　要：采用三电极电化学测试方法研究了H06H1和H05MnNiMo两种焊丝对X80管线钢焊接接头热影响区在Na2S介质中的耐蚀性.结果表明,热影响区的金相组织为针状铁素体+粒状贝氏体,晶粒细小.焊接接头的热影响区在温度为20~60℃,Na2S质量分数为1.0%~2.0%的范围内,随着Na2S质量分数的增大和温度的升高,腐蚀速率加大,腐蚀速率在0.24~0.81 mm/a的范围内,腐蚀过程为阳极极化控制的腐蚀体系.在温度达40℃以上,出现阳极扩散控制的腐蚀过程.A three-electrode electrochemistry method is adopted to research the corrosion resistance of heat-affected zone for X80 pipeline steel welding joint prepared by two welding wires(H06H1 and H05MnNiMo) in the Na2S solution.The results show that the metallurgical structure of the weld heat-affected zone is needle-like ferrite and granular bainite,and the crystal grain is petty.The corrosion rate of the heat-affected zone increases as the raise of Na2S concentration and temperature,which the corrosion speed is 0.240.81 mm/a when the temperature is 20-60 ℃ and the concentration of Na2S is 1.0%-2.0%,and the corrosion procedure is the anodic polarization of corrosion system;the corrosion procedure is anodic diffusion when the temperature is above 40 ℃.

关 键 词：管线钢 X80钢级 焊接热影响区 S2-腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]