Effects of Different Welding Methods on the Intergranular Corrosion Resistance Performance of Nickel-Based Alloy

被引：0
|
作者：
Xu L. [1 ,2 ]
Shao C. [1 ,2 ]
Jing H. [1 ,2 ]
Zhao L. [1 ,2 ]
Han Y. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Tianjin University, Tianjin
[2] Tianjin Key Laboratory of Modern Connection Technology, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 01期
基金：
中国国家自然科学基金;
关键词：
cold metal transfer(CMT); intergranular corrosion; nickel-based alloy;
D O I：
10.11784/tdxbz202112030
中图分类号：
学科分类号：
摘要：
To explore the corrosion resistance performance of the nickel-based alloy overlay applied to a bimetallic tube，gas tungsten arc welding(GTAW)and cold metal transfer(CMT)welding were used to deposit 625 alloy (Inconel 625)on X65 pipeline steel. The double-loop electrochemical potentiodynamic reactivation(DL-EPR) test was used to evaluate the intergranular corrosion resistance of the overlay. The DL-EPR test showed that the degree of sensitization(DOS)value of the CMT-welds was 0.5% less than that of the GTAW-welds，indicating that CMT-welds exhibited better resistance to intergranular corrosion. The weight-loss corrosion test under simulated service conditions showed the corrosion of the GTAW-welds and CMT-welds. Numerous corrosion products rich in Fe and S appeared on the GTAW-welds surface，while only a few existed on the CMT-welds surface. The corrosion rate of the GTAW-welds was calculated as 0.12 mm/a，while that of the CMT-welds was only 0.01 mm/a，further proving that compared to the GTAW-welds，the CMT-welds displayed better resistance to intergranular corrosion. In addition，under the same welding process，the intergranular corrosion resistance of the overlay was unevenly distributed，and the higher Fe content in the overlay near the X65 substrate reduced the intergranular corrosion resistance of the 625 alloy overlays. © 2023 Tianjin University. All rights reserved.
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页码：11 / 17
页数：6
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