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Influence of Mo2C nanoparticle concentration on the formation mechanism, friction and corrosion performances of MAO coating on 2A70 aluminum alloy
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DOI：10.1016/j.surfin.2026.109405.png)
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Abstract
En 中文
The forming characteristics of Microarc Oxidation (MAO) technology result in generally porous, microcracked ceramic coatings on aluminum alloys, which is a critical factor limiting the further improvement of MAO coating performance. Oxide ceramic coatings were prepared by adding 0 similar to 8 g/L of molybdenum carbide (Mo2C) nanoparticle at different concentrations to a phosphate-based electrolyte using MAO technology. The phase composition, microstructural features, wear resistance, and corrosion resistance of the MAO coatings were systematically investigated using X-ray diffraction (XRD), scanning electron microscopy with energy dispersive spectroscopy (SEM, EDS), hardness measurements, a reciprocating friction-wear test, and electrochemical testing. The results indicate that Mo2C nanoparticles were successfully incorporated into the microarc oxidation coatings as the Mo2C phase, and their concentration significantly influenced the coating growth and properties. At a Mo2C concentration of 6 g/L, the average coating thickness reached approximately 58 mu m, and the porosity decreased to 3.24%. The microhardness was improved by 36.1% compared to the coating obtained from the base electrolyte, reaching about 1180 HV. Meanwhile, the time required for friction coefficient stabilization was shortened, and the wear resistance was significantly enhanced; additionally, the corrosion resistance of the MAO coating was also considerably improved. However, an excessively high Mo2C content may lead to particle agglomeration, which increasing defects in the coating and thereby degrading its wear and corrosion resistance. This study presents an efficient optimization scheme for surface modification of 2A70 aluminum alloy, which is of great significance for expanding its applications in harsh wear-resistant and corrosive environments.
Keywords:
Microarc oxidation
Aluminum alloys
Friction performance
Corrosion resistance
Mo2C
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