The impact of surface scratches on the corrosion behavior of nanocrystalline high entropy alloy coatings: Electrochemical experiments and first-principles study

Applied materials today Pub Date : 2023-04-01 DOI:10.1016/j.apmt.2023.101767

Shuang Peng, Jiang Xu, Dongsheng Hu, Zong-Han Xie, Paul Munroe

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引用次数: 1

Abstract

To prolong the service life of engineering components used in aggressive environments, a TiZrHfMoW refractory high entropy alloy (RHEA) coating was prepared onto a titanium alloy substrate. Various electrochemical analytical techniques were used to evaluate the corrosion resistance of the scratched RHEA coating in a 3.5 wt.% NaCl solution. The electrochemical corrosion tests indicate that the scratched RHEA coating exhibits a higher electrochemical stability and a lower corrosion rate than the bare titanium alloy. The effects of the localized plastic deformation on the corrosion behavior for the RHEA coating was investigated. A slab model for the RHEA surface was proposed for the first-principles calculation to explored the change of the electron work function (EWF) as a function of external stress. The influence of the constituent elements in the RHEA on the mechanical properties and the electron work function was study to uncover the mechanism underlying the high scratch corrosion resistance of the RHEA coating and provide guidance for the composition design of refractory high entropy alloy.

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表面划痕对纳米晶高熵合金涂层腐蚀行为的影响:电化学实验和第一性原理研究

为了延长恶劣环境下工程部件的使用寿命，在钛合金基体上制备了TiZrHfMoW耐火高熵合金(RHEA)涂层。采用多种电化学分析技术评价了划痕涂层在3.5 wt.% NaCl溶液中的耐蚀性。电化学腐蚀试验表明，与裸钛合金相比，刮痕涂层具有更高的电化学稳定性和更低的腐蚀速率。研究了局部塑性变形对涂层腐蚀行为的影响。提出了一种用于第一性原理计算的平板模型，探讨了电子功函数(EWF)随外加应力的变化规律。研究了RHEA中组成元素对其力学性能和电子功函数的影响，揭示了RHEA涂层耐划伤腐蚀的机理，为耐火高熵合金的成分设计提供指导。

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Applied materials today

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