| 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. |
| 关键词: 管线钢 X80钢级 焊接热影响区 S2-腐蚀 |
| DOI： |
| 分类号: |
| 基金项目:陕西省腐蚀与防护重点实验室项目资助(2006B22) |
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| Corrosion resistance of X80 pipeline steel heat-affected zone in S2- medium |
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BI Zongyue1,2, Lei Ali1, WANG Na1, FENG Lajun1
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1.School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China;2.Baoji Petroleum Steel Pipe Co., Ltd, Shan'xi, Baoji 721008, China
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| 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℃. |
| Key words: pipeline steel X80 steel grade welding heat-affected zone S2-corrosion |
