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Study on the process of scanning micro arc oxidation

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Document pages: 12 pages

Abstract: Scanning micro arc oxidation (SMAO) is a coating process based on traditional micro arc oxidation (MAO). The key difference is that the deposition in SMAO is achieved by spraying the electrolyte flow onto the substrate surface using a stainless steel nozzle, rather than immersing the workpiece in the electrolytic cell. In this study, the discharge characteristics, coating morphology and properties of SMAO were analyzed and compared with the Mao results under similar conditions. The results show that Mao and SMAO have similar spark and micro arc life and size, although there are significant differences in incubation time and discharge distribution. The results also show that the voltage and current densities of Mao and SMAO show similar behavior, but have significantly different characteristicsnsient and steady-state values. Results obtained from coating A356 aluminum sheet show that oxide thickness and growth rate in SMAO are strongly dependent on interelectrode spacing and travel speed. Analysis of the SMAO coating morphology and structure showed that a denser and slightly harder layer was deposited in comparison to MAO and is attributed to reduced porosity and increased formation of α-Al2O3. Preliminary results indicate that SMAO represents a viable process for coating of aluminum surfaces.

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