Effect of high temperature oxidation prefab film on formation of micro-arc oxidation coatings on 6061aluminum alloy

▸ The effect of prefab film on the initial stage of growth process of the MAO ceramic coatings was studied. ▸ The evolution processes of the micro-discharge and the surface morphology, and their relationship were studied. ▸ The prefab film promoted the rate of the evolution process of the surface morphology and micro-discharges. ▸ The prefab film and electrolyte composition, especially element P, participated in the growth process of the MAO coatings.