Influence of Voltage Parameters on Formation Process of MAO Ceramic Coating on Aluminum Alloy
In this paper, the influence of positive and negative voltages to the formation process of ceramic coating on aluminum alloy was studied. The result indicates that, increasing of positive or negative voltage is favorable to the thickness increase and uniformity of the ceramic coating, the thickness of ceramic coating is linear correlation to the positive electrical quantity which is relative to loaded voltages. The ceramic coating is composed of α-Al2O3, γ-Al2O3 and mullite phases, and the voltages, especially negative voltage can increase the mass fraction of α-Al2O3 phase in the outer side of ceramic coating. The effects of voltage parameters on surface morphology of ceramic coating, thickness of ceramic coating and phase composition of ceramic coating is evident, in which the positive voltage is a decisive factor and the negative voltage is an important assistant factor.
Zhengyi Jiang, Shanqing Li, Jianmin Zeng, Xiaoping Liao and Daoguo Yang
F. Guo et al., "Influence of Voltage Parameters on Formation Process of MAO Ceramic Coating on Aluminum Alloy", Advanced Materials Research, Vols. 189-193, pp. 931-936, 2011