Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution

doi:10.1016/j.ceramint.2020.01.219

IMR OpenIR

	Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution
	Zhang, Zerong 1,2; Qian, Yuhai 1; Xu, Jingjun 1; Zuo, Jun 1; Li, Meishuan 1
通讯作者	Qian, Yuhai(yhqian@imr.ac.cn)
	2020-06-01
发表期刊	CERAMICS INTERNATIONAL
ISSN	0272-8842
卷号	46 期号:8 页码:11846-11853
摘要	Cr2AlC and its composites containing alpha-Al2O3 (6.1 and 15.2 wt %) were prepared by hot pressing and their corrosion behaviors in air-saturated 3.5 wt % NaCl aqueous solution were investigated by electrochemical testing methods. It was revealed that the secondary phase of Al2O3 particles mainly distributed along grain boundaries of Cr2AlC matrix. The potentiodynamic polarization measurements showed that the corrosion current densities of these Cr2AlC composites were lower than that of the pure Cr2AlC. The Aluminum in Cr2AlC was prone to be attacked more easily. When immersed at open circuit potential (OCP), Al readily slipped out from Cr2AlC matrix into NaCl solution in the form of dissoluble species. But in the case of polarization, regardless of potentiostatic polarization or potentiodynamic polarization, more de-intercalated Al, reacted with the electrolyte to form corrosion products of Al2O3 and/or AlOOH and deposited on the sample surface. For Cr2AlC/alpha-Al2O3 composites, the presence of Al2O3 weakened the corrosion along grain boundaries by partly blocking the permeation of electrolyte and inhibiting the anodic dissolution process.
关键词	MAX phase Al2O3 Electrochemical corrosion Grain boundaries
资助者	National Natural Science Foundation of China
DOI	10.1016/j.ceramint.2020.01.219
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51571205] ; National Natural Science Foundation of China[51571203]
WOS研究方向	Materials Science
WOS类目	Materials Science, Ceramics
WOS记录号	WOS:000528483600046
出版者	ELSEVIER SCI LTD
引用统计	被引频次：12[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/321006/138658
专题	中国科学院金属研究所
通讯作者	Qian, Yuhai
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Zerong,Qian, Yuhai,Xu, Jingjun,et al. Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution[J]. CERAMICS INTERNATIONAL,2020,46(8):11846-11853.
APA	Zhang, Zerong,Qian, Yuhai,Xu, Jingjun,Zuo, Jun,&Li, Meishuan.(2020).Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution.CERAMICS INTERNATIONAL,46(8),11846-11853.
MLA	Zhang, Zerong,et al."Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution".CERAMICS INTERNATIONAL 46.8(2020):11846-11853.