Study on the Formation Mechanism of Micro-Arc Oxidation Coatings on Magnesium Alloys

Xian Ming Chen; Cheng Ping Luo; Jiang Wen Liu

doi:10.4028/www.scientific.net/MSF.650.228

Paper Titles

Effects of Long-Term Aging at 1070°C on Microstructure and Mechanical Properties of Ni₃Al-Base Alloy IC6E
p.205

Oxidation Behaviour of MCrAlY and MCrAlY +ZrO₂ Coatings on Ni-Based IC6 Superalloy
p.210

Effects of Conical Transition Section on Microstructure of a Ni₃Al-Base Single Crystal Superalloy IC6SX
p.214

Effect of Welding Parameters and Post-Weld Heat Treatment on the Cracking Sensitivity of Weldments in Electron Beam Welded Rene 41 with Incoloy907
p.219

Study on the Formation Mechanism of Micro-Arc Oxidation Coatings on Magnesium Alloys
p.228

Effect of Ti Content on Hydrogen Storage Properties of Amorphous MgNi Alloy
p.234

Application of Regression Analysis to Optimize Hot Compaction Processing in an Indirect Solid-State Recycling of Mg Alloy
p.239

Phase Diagram Calculation and Experimental Study on the New Type Mg-Al-Zn-Ca-Sr Alloy in the Mg-Rich Region
p.246

The Study of Interfacial Reactions and Mechanics Properties for Die Casting (Al₆₃Cu₂₅Fe₁₂)p /AZ91 Composites
p.253

HomeMaterials Science ForumMaterials Science Forum Vol. 650Study on the Formation Mechanism of Micro-Arc...

Study on the Formation Mechanism of Micro-Arc Oxidation Coatings on Magnesium Alloys

Abstract:

This article concerned with the formation mechanism of the micro-arc oxidization(MAO) coating on magnesium alloys. The micro-arc oxidation ceramic coating on AZ91 magnesium alloy was prepared in a silicate alkaline solution (Na2SiO3:5-30g/l, NaOH: 1-5g/l, KF: 5-8g/l, Na3C6H5O7: 0.5-2g/l, EDTA: 0.5-2g/l). The experiments were carried out in AC current galvanostatic mode with a current density of 20-50A/dm2. The microstructure of the MAO coating was characterized by means of transmission electron microscopy(TEM). Microcrystallite and/or nanocrystallite were found in the MAO coatings, the size of the former was about 50-200nm and the latter was about 20-50nm. Cellular structure was observed in the coatings, which was composed of a lot of micro/nano grains. The grains grew preferentially in some directions during the MAO process, and the cellular structure is formed by the grains growing in a laminar way. The cellular structures also grew and aggregated by laminar way to form the whole MAO coatings.

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Periodical:

Materials Science Forum (Volume 650)

Pages:

228-233

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.650.228

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Online since:

May 2010

Authors:

Xian Ming Chen, Cheng Ping Luo, Jiang Wen Liu

Keywords:

Cellular Structure, Film Coating, Growth Mechanism, Magnesium Alloy, Micro-Arc Oxidation (MAO), Microcrystallite, Nanocrystallite

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