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中国腐蚀与防护学报  2023, Vol. 43 Issue (1): 95-103     CSTR: 32134.14.1005.4537.2022.104      DOI: 10.11902/1005.4537.2022.104
  研究报告 本期目录 | 过刊浏览 |
690 MPa级耐候桥梁钢焊接接头在模拟工业大气环境下的耐蚀性研究
程鹏1,2, 刘静1(), 牟文广2, 黄峰1, 黄先球2, 庞涛2
1.武汉科技大学 省部共建耐火材料与冶金国家重点实验室 湖北省海洋工程材料及服役安全工程技术研究中心武汉 430081
2.宝钢股份中央研究院 武汉 430081
Corrosion Behavior of Weld Joint of 690 MPa Weathering Bridge Steel in Simulated Industrial Atmosphere
CHENG Peng1,2, LIU Jing1(), MU Wenguang2, HUANG Feng1, HUANG Xianqiu2, PANG Tao2
1.State Key Laboratory of Refractories and Metallurgy, Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan University of Science and Technology, Wuhan 430081, China
2.Central Research Institute, BaoShan Iron&Steel Co. Ltd., Wuhan 430081, China
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摘要: 

采用周期浸润腐蚀实验和电化学测试方法,结合扫描电镜 (SEM)、电子探针 (EPMA) 等表面测试技术研究了690 MPa级耐候桥梁钢焊接接头在模拟工业大气环境下的耐蚀性。结果表明,在腐蚀初期,由于微观组织的不同,以铁素体为主的焊缝区耐蚀性优于贝氏体为主的母材区,同样由于晶粒粗大且分布不均匀导致贝氏体组织的热影响区耐蚀性最差,焊接接头不同微区域未发生明显电偶腐蚀;在腐蚀后期,Cu、Cr等在焊接接头不同区域的锈层中明显富集,Ni在焊缝区锈层中富集量远高于母材区和热影响区,焊缝区由于合金元素含量较高使其锈层更加平整致密且具有较高的极化电阻和阻抗值,导致整个焊接接头的耐蚀性能好于母材。

关键词 耐候桥梁钢焊接接头工业大气环境    
Abstract

The corrosion behavior of weld joint of 690 MPa weathering bridge steel in simulated industrial atmosphere was investigated by periodic accelerated corrosion test, coupled with electrochemical test, scanning electron microscope (SEM), electron probe microanalyzer (EPMA) and other surface characterization techniques. The results show that in the early stage of corrosion, due to the difference of microstructure, the corrosion resistance of the weld zone composed mainly of ferrite is better than that of the base material composed mainly of bainite, the heat affected zone with bainite microstructure has the worst corrosion resistance due to the coarsened and non-uniformly distributed grains, however the potential difference between different areas of the welded joint does not cause galvanic corrosion. In the later stage of corrosion, Cu and Cr are obviously enriched in the rust layer in different areas of the welded joint, while Ni content in the rust layer at the weld zone is much higher than that at the base metal zone and the heat affected zone. Due to the large alloying element content in the weld zone, where the rust layer is more smooth and compact and has higher polarization resistance and impedance value,which may result in better corrosion resistance of the whole welded joint rather than the base metal.

Key wordsweathering bridge steel    weld joint    industrial atmospheric
收稿日期: 2022-04-11      32134.14.1005.4537.2022.104
ZTFLH:  TG174  
基金资助:国家重点研发计划专项(2017YFB030480)
作者简介: 程鹏,男,1986年生,硕士,高级工程师

引用本文:

程鹏, 刘静, 牟文广, 黄峰, 黄先球, 庞涛. 690 MPa级耐候桥梁钢焊接接头在模拟工业大气环境下的耐蚀性研究[J]. 中国腐蚀与防护学报, 2023, 43(1): 95-103.
Peng CHENG, Jing LIU, Wenguang MU, Feng HUANG, Xianqiu HUANG, Tao PANG. Corrosion Behavior of Weld Joint of 690 MPa Weathering Bridge Steel in Simulated Industrial Atmosphere. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 95-103.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.104      或      https://www.jcscp.org/CN/Y2023/V43/I1/95

SampleCSiMnPSCuCrNi
Q690qENH<0.100.111.530.008<0.0050.3-0.40.4-0.60.5-0.7
XY-ER80QNH<0.100.441.400.0060.010.2-0.30.2-0.31.8-2.2
表1  Q690qENH钢和焊缝的化学成分
图1  取样示意图
图2  Q690qENH钢焊接接头的显微组织
图3  Q690qENH钢焊接接头的SKP图
图4  Q690qENH钢焊接接头与母材酸洗前后腐蚀形貌
图5  Q690qENH钢焊接接头不同区域腐蚀384 h后的表面形貌
图6  焊接接头不同区域腐蚀384 h后的截面锈层形貌和元素分布
图7  Q690qENH钢焊接接头不同区域开路电位随时间变化曲线
图8  焊接接头不同区域线性极化电阻随时间变化曲线
图9  焊接接头不同区域腐蚀不同时间的电化学阻抗图及其等效电路
Time / hSampleRrRctRr+Rct
0BM---278.8278.8
WM---308308
HAZ---254.2254.2
96BM165.3348.4513.7
WM233521.9754.9
HAZ140.1293.6433.7
192BM178.6393.1571.7
WM207.3425.8633.1
HAZ169.7379.7549.4
384BM190.4395.1585.5
WM225.5485.7711.2
HAZ119.6332.9452.5
表2  3种试样腐蚀不同时间后的EIS拟合参数
图10  焊接接头不同区域腐蚀不同时间后的|Z|0.01 Hz值
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