| Corrosion behaviors of Cr2AlC/alpha-Al2O3 composites in 3.5 wt. % NaCl aqueous solution | |
| Zhang, Zerong1,2; Qian, Yuhai1; Xu, Jingjun1; Zuo, Jun1; Li, Meishuan1 | |
| Corresponding Author | Qian, Yuhai(yhqian@imr.ac.cn) |
| 2020-06-01 | |
| Source Publication | CERAMICS INTERNATIONAL
 |
| ISSN | 0272-8842 |
| Volume | 46Issue:8Pages:11846-11853 |
| Abstract | 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. |
| Keyword | MAX phase Al2O3 Electrochemical corrosion Grain boundaries |
| Funding Organization | National Natural Science Foundation of China |
| DOI | 10.1016/j.ceramint.2020.01.219 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51571205] ; National Natural Science Foundation of China[51571203] |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Ceramics |
| WOS ID | WOS:000528483600046 |
| Publisher | ELSEVIER SCI LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/138658 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Qian, Yuhai |
| Affiliation | 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 |
| 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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