Surface Modifications of Mg Alloys Based on Micro-Arc Oxidation Methods from Manufacturing Perspectives

Hong Tao; King Ho So; Echo Li; Xue Zhu Zhang; Gary Lai

doi:10.4028/www.scientific.net/AMM.548-549.284

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 548-549Surface Modifications of Mg Alloys Based on...

Surface Modifications of Mg Alloys Based on Micro-Arc Oxidation Methods from Manufacturing Perspectives

Abstract:

Chemically and mechanically protective coatings are formed on surface of Magnesium alloys by micro-arc oxidation (MAO) methods. From manufacturing perspectives, modification of the obtained MAO surfaces was made in two aspects. Firstly, the protection is enhanced by forming super-hydrophobic surfaces, with water contact angle higher than 120^o, attributed to hierarchical nanomicro structures. The overall process involves alkaline etching to form nanoscale structures on top of micro-porous surface achieved during micro-arc oxidation processes. Secondly, the electrical property of the MAO surfaces is modified. A film with electrical conductivity of 2.4Ω/sq is achieved by Ni deposition and characterized by four point probe measurement. The morphology, phase, and chemical composition of all surfaces are investigated by SEM and XRD analysis.

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Periodical:

Applied Mechanics and Materials (Volumes 548-549)

Pages:

284-288

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.548-549.284

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Online since:

April 2014

Authors:

Hong Tao, King Ho So, Echo Li, Xue Zhu Zhang, Gary Lai

Keywords:

Corrosion Resistance, Micro-Arc Oxidation, Nanostructure, Super-Hydrophobic

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