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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >The corrosion behavior of ultra-fine grained CoNiFeCrMn high-entropy alloys
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The corrosion behavior of ultra-fine grained CoNiFeCrMn high-entropy alloys

机译：超细晶粒高熵合金的腐蚀行为

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摘要

The ultra-fine grained (UFG) CoCrFeMnNi alloy (Cantor alloy) exhibits high mechanical strength. As far as its real application is concerned, the corrosion behavior of the UFG Cantor alloy should also be taken into account, which, however, has not been reported so far. In this paper, the UFG Cantor alloy was prepared using Cryo-rolling followed by short time annealing, and its corrosion behavior was investigated by electrochemical test in 3.5 wt% NaCl aqueous solution at ambient temperature. Potentiodynamic polarization test and electrochemical impedance spectroscopy (EIS) indicated that an unstable passive layer formed more easily on the surface of the UFG Cantor alloy and made it show an enhanced corrosion rate, as compared with coarse grained (CG) sample. Detailed microstructural characterization showed that after the mechanical processing, the Cr-enriched region (sigma phase) formed in the UFG Cantor alloy, resulting in the galvanic corrosion between the sigma phase and its nearby matrix phase. Moreover, Crdepleted passive layer formed on the surface of corroded specimen decreased the stability of the passive layer, and hence decreased the resistance to pitting corrosion. (C) 2019 Elsevier B.V. All rights reserved.
机译：超细颗粒（UFG）COCRFEMNNI合金（CARTOR合金）表现出高机械强度。就其实际应用而言，也应考虑到UFG Cantor合金的腐蚀行为，但是，尚未向迄今为止报告。本文采用冷冻轧制制备UFG响应合金，然后进行短时间退火，通过在环境温度下的3.5wt％NaCl水溶液中的电化学试验研究其腐蚀行为。电化学偏振试验和电化学阻抗光谱（EIS）表明，与粗粒（CG）样品相比，在UFG Cantor合金的表面上更容易形成的不稳定无源层，并表现出增强的腐蚀速率。详细的微观结构表征显示，在机械加工后，在UFG Cantor合金中形成的CR富集区域（Sigma相），导致Sigma相及其附近的基质相之间的电抗腐蚀。此外，在腐蚀标本的表面上形成的Crdepleted被动层降低了无源层的稳定性，因此降低了对蚀腐蚀的抗性。 （c）2019 Elsevier B.v.保留所有权利。

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