激光熔覆法制备的石墨烯强化 CoCrFeNiMo0.2 高熵合金在模拟酸雨中的腐蚀性能

IF 0.7 4区 物理与天体物理 Q4 OPTICS Journal of Russian Laser Research Pub Date : 2024-03-15 DOI:10.1007/s10946-024-10194-6
Xingwu Qiu
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引用次数: 0

摘要

我们研究了通过激光熔覆制备的石墨烯(Gr)强化 CoCrFeNiMo0.2 高熵合金(HEAs)。通过降雨实验、电化学实验和浸泡实验研究了合金在模拟酸雨条件下的腐蚀特性。实验结果表明,Gr 增强 CoCrFeNiMo0.2 HEA 的微观结构主要包括三种形态。钼元素发生偏析。Gr 在熔化过程中集中在合金表面。合金具有面心立方(FCC)单相结构。随着降雨量和浸泡时间的增加,Gr 增强 HEA 的耐腐蚀性降低。随着 pH 值的增加,合金的耐腐蚀性增强。Gr 增强 CoCrFeNiMo0.2 HEA 的腐蚀电流密度较小,表明合金具有优异的耐腐蚀性。电化学阻抗谱(EIS)显示,随着 pH 值的增加,电容弧半径、阻抗模量和相位角均呈上升趋势。优异耐腐蚀性的原因如下:表面富集的 Gr 在合金熔化过程中起到屏蔽作用,Gr 与合金元素反应在合金表面形成一层被动膜,Gr 引起晶格畸变和晶粒细化,提供了合金的单相结构。
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Corrosion Performance of Graphene-Strengthened CoCrFeNiMo0.2 High-Entropy Alloy in Simulated Acid Rain Prepared by Laser Cladding

We study the graphene (Gr)-strengthened CoCrFeNiMo0.2 high-entropy alloys (HEAs) prepared by laser cladding. The corrosion properties of the alloys under simulated acid rain conditions are studied through rainfall experiments, electrochemical experiments, and immersion experiments. The experimental results show that the microstructure of the Gr-strengthened CoCrFeNiMo0.2 HEAs mainly including three morphologies. Mo element occurs segregation. Gr concentrates on the alloy surface during melting. The alloy has a face centered cubic (FCC) single-phase structure. With increase in the rainfall and immersion period, the corrosion resistance of the Gr-strengthened HEAs decreases. With increase in the pH, the corrosion resistance of the alloys increase. The corrosion current densities of Gr-strengthened CoCrFeNiMo0.2 HEAs are small, indicating that the alloys have excellent corrosion resistance. Electrochemical impedance spectroscopy (EIS) shows that as the pH increases, the capacitance arc radius, impedance modulus, and phase angle show increasing trend. The reason for excellent corrosion resistance are as follows: the Gr enriched on the surface plays a shielding role during alloy melting, Gr reacts with alloy elements to form a passive film on the alloy surface, the lattice distortion and grain refinement are caused by Gr, providing the single-phase structure of the alloy.

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期刊介绍: The journal publishes original, high-quality articles that follow new developments in all areas of laser research, including: laser physics; laser interaction with matter; properties of laser beams; laser thermonuclear fusion; laser chemistry; quantum and nonlinear optics; optoelectronics; solid state, gas, liquid, chemical, and semiconductor lasers.
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