Corrosion behavior of Al-containing CoNiV alloys. (October 2022)

• Record Type: Journal Article
• Authors: Li, Mengwei; Nutor, Raymond Kwesi; Cao, Qingping; Wang, Xiaodong; Ding, Shaoqing; Zhang, Dongxian; Jiang, Jian-Zhong
• Is Part Of: Corrosion science. Volume 207(2022)
• Publication Date: 2022-10
• Subjects: Corrosion -- Medium-entropy alloys -- Electrochemical passive; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110567
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The corrosion behaviors of (CoNiV)100−x Alx (x = 0, 3, 5 at.%) MEAs in NaCl and H2 SO4 solutions have been systematically investigated. The corrosion properties of CoNiV alloys with different average grain sizes in the Cl −1 ions containing solution seems to be related to the proportion of (100) orientation plane. The Al addition results in the enhanced corrosion resistance in NaCl solution and no obvious difference in H2 SO4 solution. Oxides of V are the main components of the passive films formed on CoNiV and (CoNiV)97 Al3 alloys. The enrichment of the V- and Al- oxides in the passive film on the (CoNiV)95 Al5 alloy improves corrosion resistance. Highlights: Al addition enhances corrosion resistance of CoNiV MEA in 3.5 wt.% NaCl solution. The corrosion of CoNiV MEA is related to the proportion of (100) orientation plane. The concentration of ions in the solution states selective dissolution did not occur. The passive ability of CoNiV MEA is similar to the nature of V element. The V and Al oxides enriched layer on (CoNiV)95 Al5 MEA improves corrosion resistance.