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Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution
Zhang, Zerong; Qian, Yuhai; Xu, Jingjun; Zuo, Jun; Li, Meishuan
2020-06-01
Source PublicationCERAMICS INTERNATIONAL
Volume46Issue:8Pages:11846-11853
AbstractCr2AlC 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.
DOI10.1016/j.ceramint.2020.01.219
WOS IDWOS:000528483600046
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82823
Collection中国科学院金属研究所
Recommended Citation
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.
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