Influence of Voltage Parameters on Formation Process of MAO Ceramic Coating on Aluminum Alloy

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 189-193)
• Pages: 931-936
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.189-193.931
• Online since: February 2011
• Authors: Feng Guo, Rong Ming Liu, Peng Fei Li
• Keywords: Aluminium Alloy, Ceramic Coating, Micro-Arc Oxidation (MAO), Voltage Parameter

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