Corrosion Behavior and Mechanism of Weld Joints of Q370qENH Weathering Steel After Submerged Arc Welding
SUN Hongbin1, YANG Shaojun1, ZHANG Cong2, YU Xiayang3, ZHU Zhihui4, WANG Bingfeng3
1.Shandong Railway Investment Holding Group Co Ltd, Jinan 250102, Shandong, China;
2.Qingdao Branch of China Railway №10 Engineering Group Co Ltd, Qingdao 266000, Shandong, China;
3.School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China;
4.School of Civil Engineering, Central South University, Changsha 410075, Hunan, China
Abstract：In order to study the corrosion mechanism of welded material of Q370qENH weathering steel by submerged arc welding (SAW) , experiments were conducted on immersion corrosion and electrochemical corrosion of Q370qENH substrate samples and weld seam samples after SAW process, and the morphology and composition of the surface rust formed after immersion corrosion were characterized. The results indicate that the corrosion resistance of the weld seam of Q370qENH by SAW process is lower than the substrate, and its electrochemical impedance is 38% of the substrate. The reason for the lower corrosion resistance of weld seam than the substrate and the formation mechanism of surface rust were all analyzed. The research results can provide scientific and theoretical basis for the safety assessment for the service of weathering steel in engineering projects of steel bridges for high-speed railway, as well as its following maintenance.
孙洪斌, 杨少军, 张丛, 于夏洋, 朱志辉, 汪冰峰. 耐候钢Q370qENH埋弧焊焊接接头锈蚀行为与机理研究[J]. 矿冶工程, 2024, 44(1): 152-156.
SUN Hongbin, YANG Shaojun, ZHANG Cong, YU Xiayang, ZHU Zhihui, WANG Bingfeng. Corrosion Behavior and Mechanism of Weld Joints of Q370qENH Weathering Steel After Submerged Arc Welding. Mining and Metallurgical Engineering, 2024, 44(1): 152-156.
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2024, Vol. 44 
