Work

Effect of ultrasonic impact coverage on microstructure and properties of laser cladding CrCoNi medium-entropy alloy coating

Year: 2025

Type: article

Abstract: To investigate the effect of varying ultrasonic impact coverage rates on the wear and corrosion resistance of CrCoNi coatings, a CrCoNi medium-entropy alloy (MEA) coating was fabricated on a 316L substrate via laser cladding, followed by ultrasonic impact treatment (UIT). The microstructure, microhardness, friction and wear performance, and corrosion resistance of the coatings were tested and analyzed at different UIT coverage rates. The results revealed that when the impact amplitude was 20 μm and the coverage rate was 200 %, the coating exhibited the most significant changes in thickness and grain size, resulting in optimal performance. Regarding wear resistance, the wear performance improved initially and then declined as the coverage rate increased, with the minimum wear mass loss and the lowest friction coefficient observed at a coverage rate of 200 %. In terms of corrosion resistance, the CrCoNi coating displayed a higher self-corrosion potential and a lower self-corrosion current density. The equivalent circuit fitting data indicated the formation of a more stable and uniform passive film, which contributed to enhanced corrosion resistance.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2025.04.186

Authors: Danlin Shao, Xiaolin Bi, Chengsi Wang, Minsheng Hong, Mingjun Yan, Ruifeng Li

Institution: Jiangsu University of Science and Technology

Language: English

Topic: Surface Treatment and Coatings

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,640

Funders: Innovative Research Group Project of the National Natural Science Foundation of China, National Natural Science Foundation of China