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Structure and Properties of a Micro-arc Oxidation Coating Coupled with Nano-Al2O3 Particles on AZ31B Magnesium Alloy |
Xuejun CUI( ),Ruisong YANG,Mingtian LI |
Material Corrosion and Protection Key Laboratory of Sichuan Province, College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China |
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Abstract A micro-arc oxidation (MAO) coating coupled with nano-Al2O3 particles was produced on AZ31B Mg alloy by a constant voltage mode in a nano-Al2O3 particles containing Na2SiO3-NaOH aqueous solution assisted with ultrasonic vibration, and then its morphology, phase composition, corrosion- and wear-resistance were investigated by scanning electron microscopy, X-ray diffraction, electrochemical method in 3.5%(mass fraction) NaCl solution, and friction and wear tester, respectively. The results show that the coupled nano-Al2O3 particles lead the MAO coating to be thicker and denser with smaller sized pores, and the coatings composed of MgO, MgSiO3, and Al2O3. The AZ31B Mg alloy covered with MAO coating coupled with nano-Al2O3 particles shows a corrosion current density about one order of magnitude lower than the one without nano-Al2O3 particles, and the former MAO coating also shows smaller friction coefficient by applied loads of 5 and 10 N respectively. Therefore, the addition of Al2O3 particles to electrolyte solution can clearly enhance the corrosion- and wear-resistance of the MAO coating. The above effect may be ascribed to the fact that the coupled nano-Al2O3 particles dispersed into the coating pores, and then enables the MAO coating to be much dense and strengthened, and in turn, enhances its corrosion- and wear-resistance.
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