Work

Enhanced corrosion resistance of ultrafine-grained Mg–Zn–Gd alloy produced by surface sliding friction treatment

Year: 2025

Type: article

Abstract: In this work, an ultrafine-grained (UFG) structure with an average grain size of 122 nm was successfully fabricated in the Mg–2Zn–0.8Gd (wt.%) alloy via surface sliding friction treatment (SFT). The microstructural evolution and the corrosion behavior of SFTed Mg–2Zn–0.8Gd (wt.%) alloy plate were investigated. Electrochemical tests reveal that the UFG surface exhibits a higher impedance than that of the starting coarse-grained (CG) structure. The corrosion rate of the UFG specimen declines from 5.78 mm·y −1 (for CG specimen) to 4.51 mm·y −1 after SFT processing, representing an approximate 22% reduction in corrosion rate. The enhanced corrosion resistance originates from two key factors: (1) The high-density grain boundaries in the UFG layer can promote the stability of corrosion product films, which exhibit better compactness and less crack tendency compared to the CG specimen. (2) SFT processing induces the rearrangement of second-phase particles (Mg-Zn and Mg-Zn-Gd phases), which weakens the galvanic corrosion. This work reveals the corrosion behavior of the UFG-structured Mg alloy, providing a novel method to enhance the corrosion resistance of Mg alloys.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2025.10.133

Authors: Zongyan Peng, Chunquan Liu, Wenjun Ci, Lang Deng, Di Zhao, Huaqiang Xiao

Institutions: Guizhou University, Guangdong Polytechnic Normal University, Suzhou University of Science and Technology

Language: English

Topic: Magnesium Alloys: Properties and Applications

Subfield: Biomaterials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,640

Funders: National Natural Science Foundation of China, Guizhou University