Corrosion Behavior of Al-Containing CoNiV Medium Entropy Alloy Coating Fabricated by Laser Cladding
Year: 2024
Type: article
Abstract: CoNiV medium entropy alloys (MEAs) have been widely recognized for their superior corrosion resistance. Nonetheless, their extensive application has been hindered by high production costs and complex fabrication processes. In this study, CoNiVAl x MEA coatings were synthesized on AISI 304 stainless steel substrates via laser cladding technology. The microstructure, phase composition, corrosion resistance, and corrosion mechanisms of the coatings were systematically investigated by using advanced characterization techniques, including optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, and electrochemical workstation analysis. The ratio of O 2– /OH – in the passivation film of the coated surface exhibited a gradual increase with the addition of Al. The formation of the Al-containing precipitated phase L2 1 was observed at x = 0.3 and 0.4. The results demonstrated that moderate Al doping ( x ≤ 0.2) enhanced corrosion resistance by improving the stability of the passivation film and reducing the thermodynamic tendency toward corrosion. In contrast, excessive Al doping ( x > 0.2) led to the formation of the L2 1 phase, which increased the susceptibility to localized corrosion, thus compromising the overall corrosion resistance.
Source: Langmuir
Authors: Minghao Fei, Peng Xu, Ming Zhang, Jianhua Chen, Chuan Yu
Institutions: Guizhou University, Guizhou Qiannan Economic College
Language: English
Topic: High Entropy Alloys Studies
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Funder: Guizhou University
OpenAlex ID: W4400580867