. m.abudari, . l.shehadeh
Aluminum 6061 alloy is the most frequently used aluminum alloy in automobile, aircraft, and aerospace industries. However, poor wear and corrosion resistances, considerably affecting their scaled-up applications. Microarc oxidation (MAO) is ecofriendly, straightforward, efficient, and rapid technique for improving the surface characteristics of aluminum alloys and proves to be a highly effective surface treatment technique to enhance the corrosion and wear resistances of aluminum alloys. This article describes progresses realized in recent years for understanding the effects of electrolyte type, electrolyte composition, and additives on the morphology and properties of MAO coating film, and on the hardness of MAO coatings .Usually, applying an electrolyte system and introducing some additives in appropriate concentrations can improve the quality of the MAO coatings and their hardness, whereas some additives have negative effects on the hardness which is related to the corrosive behavior of aluminum. This review article showed that the microhardness values of the MAO coatings which was prepared in Na2AlO2 electrolyte was greater than the one which was prepared in Na2SiO3 electrolyte with percentage 62 %. As well as found that coatings generated by using pulsed-bipolar mode power source in MAO gives superior characteristics and investigated that provide additives to electrolyte not always enhance hardness and corrosion resistance. The review also highlights that higher hardness often correlates with improved corrosion resistance.
Published on 21/04/25Submitted on 13/04/25
Licence: CC BY-NC-SA license
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