Effect of current density on tribological properties of micro-arc oxidation ceramic film on Al-Mg-Sc alloy

Abstract

Ceramic films on Al-Mg-Sc alloy were prepared in alkaline sodium silicate electrolyte solution at different current densities by micro-arc oxidation (MAO) technique. The influence of current density on the microstructure and tribological property of the MAO ceramic films was investigated. The experimental results indicated that the surface porosity decreased and roughness increased with the increase of current density. The optimal anti-friction effect of the MAO ceramic film prepared at the current density of 10A/dm2 was obtained. The wear mechanism of MAO ceramic film was the coexistence of abrasive wear, adhesive wear and oxidation wear. The wear resistance of MAO ceramic film prepared on Al-Mg-Sc alloy structural components could be increased, which could reduce the risk of failure of structural components due to mechanical vibration.

Reduced Graphene Oxide Films to Enhance the Tribological Performance of Micro-arc Oxidation Coatings

“…The figure demonstrates that the sample contains mainly C–O/CO and Al–O forms of O, where Al–O is derived from Al–O. Additionally, Figure d exhibits the high-resolution XPS spectrum of Al 2p, indicating that Al primarily exists in the form of Al–O …”

“…To improve the tribological performance of MAO coatings, various related studies have been conducted by researchers. Currently, research on MAO coatings mainly focuses on three aspects: adjusting power supply parameters, − optimizing electrolyte composition, − and developing composite coatings. ,, The first focus is on the influence of power supply parameters and electrolyte composition on coating performance. Li et al investigated the effect of cathode voltage on the performance of MAO coatings, and a suitable negative voltage could produce denser MAO coatings with superior tribological properties .…”

Tribological Properties and Surface Wettability of Coatings Produced on the Mg-AZ31B Alloy by Plasma Electrolytic Oxidation

“…Wu et al showed that for Al-Mg-Sc alloys, the effect of increasing current density is such that it decreases the resulting PEO coating porosity and increases the roughness. The wear properties were found to be optimal for higher current densities (10 A/dm 2 ), which was attributed to the higher thickness and good adhesion of the oxide film to the substrate [27]. A similar study was also conducted for AZ31 alloy [17], where pore sizes were larger at higher current densities, while their number decreased, and the same current density was found to be optimal.…”