900℃下含氮低镍熔敷焊缝在KCl-MgCl共晶熔盐中的腐蚀行为

Corrosion Behavior of Nitrogen-Containing Low-Nickel Weld Cladding in KCl-MgCl Eutectic Molten Salt at 900 °C.

作者信息

Yang Taisen, Su Yunhai, Dai Zhiyong, Wang Yingdi, Liang Xuewei, Wei Zuyong

机构信息

School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.

出版信息

Materials (Basel). 2022 Dec 10;15(24):8831. doi: 10.3390/ma15248831.

DOI:10.3390/ma15248831

PMID:36556636

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9781760/

Abstract

In this paper, the element nitrogen (N) is used to partially replace the element nickel (Ni) in flux-cored wire. A 44%Ni-24%Cr-0.18N nitrogen-containing low-nickel flux-cored wire with excellent corrosion resistance is prepared. The corrosion behavior of nitrogen-containing low-nickel weld cladding and Inconel 625 weld cladding in 40 KCl + 60 MgCl (wt%) molten salt at 900 °C is studied. The results show that the selective dissolution of Cr occurs in both weld claddings. The corrosion resistance of the 44%Ni-24%Cr-0.18N nitrogen-containing low-nickel weld cladding is better than that of the Inconel 625 weld cladding. The reason is that added N can react with H in molten salt to generate NH4+, remove corrosive impurities of MgOH in molten salt and change the corrosion environment. N preferentially combines with Cr to form CrN, reduces the diffusion precipitation of Cr and improves the corrosion resistance.

摘要

在本文中，元素氮（N）用于部分替代药芯焊丝中的元素镍（Ni）。制备了一种具有优异耐腐蚀性的44%Ni-24%Cr-0.18N含氮低镍药芯焊丝。研究了含氮低镍焊缝熔覆层和因科镍合金625焊缝熔覆层在900℃的40KCl + 60MgCl（重量%）熔盐中的腐蚀行为。结果表明，两种焊缝熔覆层中均发生了Cr的选择性溶解。44%Ni-24%Cr-0.18N含氮低镍焊缝熔覆层的耐腐蚀性优于因科镍合金625焊缝熔覆层。原因是添加的N能与熔盐中的H反应生成NH4+，去除熔盐中MgOH的腐蚀性杂质并改变腐蚀环境。N优先与Cr结合形成CrN，减少Cr的扩散析出并提高耐腐蚀性。