Corrosion resistance and mechanism of X100 pipeline steel laser-metal active gas hybrid welds with Cr containing welding wire in NS4 solution
Corrosion resistance and mechanism of X100 pipeline steel laser-metal active gas hybrid welds with Cr containing welding wire in NS4 solution
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DOI：
10.1016/j.corsci.2023.111329
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发表时间：
2023-06-12
影响因子：
8.3
通讯作者：
Di, Hongshuang
中科院分区：
文献类型：
--
作者：
Qi, Xiaonan;Huan, Pengcheng;Di, Hongshuang
随着激光-金属活性气体(MAG)复合焊接在管道焊接中的应用，管道钢激光-MAG复合焊接的腐蚀机理得到了广泛的关注。研究了X100管线钢含铬焊丝激光-MAG复合焊接在NS4溶液中的腐蚀机理。焊缝金属(WM)的腐蚀产物为双层结构，外层为FeOOH，内层为Cr(OH)3。与母材(BM)相比，WM具有更高的铬含量和更均匀的组织，可以形成致密的腐蚀层，使其耐蚀性达到BM的水平。
The corrosion mechanism of pipeline steel laser-metal active gas (MAG) hybrid welds have been widely con-cerned with its applied in pipeline welding. The corrosion mechanism of X100 pipeline steel laser-MAG hybrid welds with Cr containing welding wire in NS4 solution was investigated. The corrosion products of weld metal (WM) had a double-layer structure, of which the outer and the inner layer were composed of FeOOH and Cr (OH)3 , respectively. Compared with the base metal (BM), WM had higher Cr content and more homogeneous microstructure, so it can form dense corrosion layer, making its corrosion resistance reach the level of the BM.