Oxide MnCr2O4 induced pitting corrosion in high entropy alloy CrMnFeCoNi
Oxide MnCr2O4 induced pitting corrosion in high entropy alloy CrMnFeCoNi
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氧化物MnCr2O4诱发高熵合金CrMnFeCoNi的点蚀
DOI：
10.1016/j.mtla.2019.100275
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发表时间：
2019-06-01
期刊：
影响因子：
3.4
通讯作者：
Ma, Xiuliang
中科院分区：
文献类型：
--
作者：
Pang, Jingyu;Xiong, Ting;Ma, Xiuliang
高熵合金CrMnFeCoNi中氧化物的组成、结构及其对腐蚀性能的影响至今尚未得到揭示。在本工作中，氧化物中的CrMnFeCoNi被确定为MnCr 2 O 4使用透射电子显微镜。此外，氧化物MnCr 2 O 4是不利的耐点蚀性的比较研究表明，CrMnFeCoNi与无氧化物。这是因为点蚀倾向于起源于MnCr 2 O 4/基体界面，即氧化物周围的基体更容易溶解。从腐蚀的角度来看，MnCr 2 O 4/基体形成局部原电池，基体作为阳极迅速溶解。
Composition and structure of the oxide and its effect on corrosion property in the high entropy alloy CrMnFeCoNi have not been revealed so far. In the present work, oxide in CrMnFeCoNi is identified as MnCr2O4 using transmission electron microscopy. Moreover, the oxide MnCr2O4 is detrimental to pitting resistance indicated by comparison study of CrMnFeCoNi with and without the oxide. This is because that the pitting prefers originating from MnCr2O4/matrix interface, in other words, the matrix around oxides dissolves more easily. From the viewpoint of corrosion, MnCr2O4/matrix forms a local galvanic cell, and the matrix as an anode dissolves quickly.