Formation and Infrared Emissivity of Microarc Oxidation Coatings on Mg-7Li Alloy

Abstract:

Ceramic coatings were successfully fabricated on Mg-7Li alloy in Na₂SiO₃ electrolyte by microarc oxidation (MAO). The phase composition, formation mechanism and infrared emissivity of the coatings were investigated. Results show that the surface of MAO coating exists some micropores with a diameter of 2-6μm due to electric breakdown. The MAO coating with 13μm thickness is mainly composed of MgO, Li₂O₂ and Mg₂SiO₄. The infrared emissivity of the MAO coating is higher than that of bare Mg-7Li alloy, mainly because the coating consisting of ionic crystals has lower lattice vibration symmetry and larger dipole moment.

• Periodical: Advanced Materials Research (Volumes 557-559)
• Pages: 1975-1978
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.557-559.1975
• Online since: July 2012
• Authors: Jun Gang Li, Ying Lv, Hong Wei Wang, Zhao Jun Zhu, Zun Jie Wei, Xiang Cai Meng
• Keywords: Coating, Infrared Emissivity, Mg-7Li Alloy, Micro-Arc Oxidation, Microstructure

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