X80管线钢焊接热影响区在含S<sup>2-</sup>介质中的耐蚀性分析

X80管线钢焊接热影响区在含S^2-介质中的耐蚀性分析

基金项目: 陕西省腐蚀与防护重点实验室项目资助(2006B22)

1.
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China;Baoji Petroleum Steel Pipe Co., Ltd, Shan'xi, Baoji 721008, China
2.
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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.
- 管线钢 /
- X80钢级 /
- 焊接热影响区 /
- S^2-腐蚀
Abstract: 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℃.
- pipeline steel /
- X80 steel grade /
- welding heat-affected zone /
- S^2-corrosion