Electrochemical dissolution of MCrAlY coatings and oxide layers on Ni-based superalloys in 3.5% NaCl and aqua-regia solutions

doi:10.1016/j.ijoes.2023.100451

IMR OpenIR

	Electrochemical dissolution of MCrAlY coatings and oxide layers on Ni-based superalloys in 3.5% NaCl and aqua-regia solutions
	Wang, Yuemiao 1,2; Yang, Yanhong 2; Qu, Jinglong 3; Cui, Chuanyong 2
通讯作者	Yang, Yanhong(yhyang@imr.ac.cn) ; Cui, Chuanyong(chycui@imr.ac.cn)
	2024-02-01
发表期刊	INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
ISSN	1452-3981
卷号	19 期号:2 页码:13
摘要	Superalloys are widely used for aerospace industry. At the same time, more and more superalloy scraps are produced. Therefore, the recycling and reuse of superalloy scraps is of great significance. Purification smelting after surface impurity removal is an application trend of superalloy regeneration technology. Electrochemical methods can be used to remove metal impurities such as oxide layers and coatings. The electrochemical dissolution behavior of a Ni-based superalloy with coating and oxide layer has been studied in 3.5 wt% NaCl solution and aqua regia solution. The results show that pitting corrosion occurs on the surface of the alloy in 3.5 wt% NaCl solution, forming a "occlude corrosion cell" and leaving a lot of pitting corrosion. The oxide layer itself is a passivation film with high stability in 3.5 wt% NaCl solution. However, in aqua regia solution, the alloy underwent strong corrosion, and the surface coating and oxide layer of the alloy fell off in large quantities. The results show that the oxide layer like a "coating" with high corrosion resistance, which prevents the reaction between the alloy and the electrolyte. However, due to the poor density of the oxide layer, the electrolyte flows into the alloy matrix along the oxide layer gap, and electrochemical reaction occurs with the matrix. In aqua regia electrolyte, the oxide layer is thus peeled off. In this study, the dissolution behavior of the coating and the oxide layer in different electrolyte solutions was clarified, and the dissolution model of the coating on the alloy surface and the spalling mechanism of the oxide layer were established.
关键词	Superalloy Oxidation Coating Electrochemical corrosion
资助者	National Key R & D Pro- gram of China ; National Science and Technology Major Project
DOI	10.1016/j.ijoes.2023.100451
收录类别	SCI
语种	英语
资助项目	National Key R & D Pro- gram of China[2021YFB3700401] ; National Science and Technology Major Project[Y2019 -VII -0011-0151]
WOS研究方向	Electrochemistry
WOS类目	Electrochemistry
WOS记录号	WOS:001170941100001
出版者	ELSEVIER
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/184446
专题	中国科学院金属研究所
通讯作者	Yang, Yanhong; Cui, Chuanyong
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Gaona Aero Mat Co Ltd, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yuemiao,Yang, Yanhong,Qu, Jinglong,et al. Electrochemical dissolution of MCrAlY coatings and oxide layers on Ni-based superalloys in 3.5% NaCl and aqua-regia solutions[J]. INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,2024,19(2):13.
APA	Wang, Yuemiao,Yang, Yanhong,Qu, Jinglong,&Cui, Chuanyong.(2024).Electrochemical dissolution of MCrAlY coatings and oxide layers on Ni-based superalloys in 3.5% NaCl and aqua-regia solutions.INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,19(2),13.
MLA	Wang, Yuemiao,et al."Electrochemical dissolution of MCrAlY coatings and oxide layers on Ni-based superalloys in 3.5% NaCl and aqua-regia solutions".INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 19.2(2024):13.