Corrosion resistance enhancement of CoCrFeMnNi high-entropy alloy fabricated by additive manufacturing. (December 2020)

• Record Type: Journal Article
• Authors: Xu, Zhenlin; Zhang, Hui; Du, Xiaojie; He, Yizhu; Luo, Hong; Song, Guangsheng; Mao, Li; Zhou, Tingwei; Wang, Lianglong
• Is Part Of: Corrosion science. Volume 177(2020)
• Publication Date: 2020-12
• Subjects: Additive manufacturing -- High-entropy alloy -- Corrosion resistance -- Microstructure -- Composition uniformity -- Grain refinement; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108954
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Equiatomic CoCrFeMnNi HEA was successfully fabricated by selective laser melting. The composition uniformty and multi-scale microstructure characterization of the SLMed HEA were studied. The SLMed CoCrFeMnNi HEA had better corrosion resistance than the as-cast CoCrFeMnNi HEA in NaCl solution. The surface three-dimensional profile of the corrosion samples was characterized by laser scanning confocal microscope. Abstract: A CoCrFeMnNi high-entropy alloy (HEA) was fabricated by additive manufacturing using selective laser melting (SLM). The corrosion behavior of the SLM-produced and as-cast CoCrFeMnNi HEA in 3.5 wt.% NaCl solution was comparatively analyzed. Compared to the as-cast HEA, more uniform composition and finer grains were observed in the SLMed HEA. The passive film formed on the SLMed HEA had a more stable and stronger protective property. The corrosion current density of the SLMed CoCrFeMnNi HEA dropped by 58 % compared to that of the as-cast HEA, indicating that the SLMed HEA had better corrosion resistance than that of the as-cast alloy.