Study on the structure and corrosion resistance of MoS₂/MgO micro-arc oxidation composite ceramic coating on the surface of ZK60 magnesium alloy

Abstract

Purpose

The purpose of this study is to examine the impact of MoS₂ on the microstructure and characteristics of micro-arc oxidized (MAO) ceramic coatings created on ZK60 magnesium alloy through the addition of varying concentrations of MoS₂ particles to the electrolyte, aiming to enhance the corrosion resistance of magnesium alloy.

Design/methodology/approach

The surface morphology, roughness and phase composition of the coatings were analyzed using scanning electron microscopy, a hand-held roughness tester and an X-ray diffractometer, respectively, and the corrosion resistance of the MAO coatings prepared by the addition of different contents of MoS₂ particles was tested and analyzed using an electrochemical workstation.

Findings

The results demonstrate that MoS₂/MgO composite coatings have been successfully prepared on the surface of magnesium alloys through micro-arc oxidation. Furthermore, the corrosion resistance of the ZK60 magnesium alloy prepared with the addition of 1.0 g/L MoS₂ was the best compared to the other samples.

Originality/value

MoS₂ particles were able to penetrate the coatings successfully during the micro-arc oxidation process, acting as a barrier in the micropores to prevent the corrosion medium from touching the surface, thus improving the corrosion resistance of the sample. The electrochemical workstation was used to study the corrosion resistance of the MoS₂/MAO coating on the ZK60 magnesium alloy.

Citation

Chen, X., Xie, W., Tang, S., Zhang, M., Song, H., Ran, Q. and Zhang, D. (2024), "Study on the structure and corrosion resistance of MoS₂/MgO micro-arc oxidation composite ceramic coating on the surface of ZK60 magnesium alloy", Anti-Corrosion Methods and Materials, Vol. 71 No. 2, pp. 213-222. https://doi.org/10.1108/ACMM-11-2023-2923