2O3 micro powder; modified mechanism"/> 2O3 micro powder additive amount on characteristics of micro-arc oxidation coating formed on AZ31A magnesium alloy, it was treated by using micro-arc oxidation in different concentration of Al2O3 micro powder electrolyte. Surface morphologies, Ca, Mg, O and Al elements distribution, phase composition of micro-arc oxidation coating were analyzed by SEM, EDS and XRD. Thickness and hardness of micro-arc oxidation coating and surface charge of Al2O3 micro powder in electrolyte were measured. The doping modification mechanism was discussed in this paper. The results show that the oxidation voltage was raised firstly and then declined gradually while Al2O3 micro powder amount increasing. The numbers and sizes of hole and distribution of Ca element on oxidation coating surface and formation efficiency decreased, compactness of coating, and the hardness of surface porosity coating increased. Oxidation coating was mainly composed by MgO and MgO4 phase."/>

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Effects of Al2O3Micro Powder Additive Amount on Characteristics of Micro-arc Oxidation Coating Formed on Magnesium Alloy
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College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan,College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan,College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan,College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan,College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan,College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan,College of Material Science and Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu,Sichuan

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    Abstract:

    In order to research the effects of Al2O3 micro powder additive amount on characteristics of micro-arc oxidation coating formed on AZ31A magnesium alloy, it was treated by using micro-arc oxidation in different concentration of Al2O3 micro powder electrolyte. Surface morphologies, Ca, Mg, O and Al elements distribution, phase composition of micro-arc oxidation coating were analyzed by SEM, EDS and XRD. Thickness and hardness of micro-arc oxidation coating and surface charge of Al2O3 micro powder in electrolyte were measured. The doping modification mechanism was discussed in this paper. The results show that the oxidation voltage was raised firstly and then declined gradually while Al2O3 micro powder amount increasing. The numbers and sizes of hole and distribution of Ca element on oxidation coating surface and formation efficiency decreased, compactness of coating, and the hardness of surface porosity coating increased. Oxidation coating was mainly composed by MgO and MgO4 phase.

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[WANG Ping, WU Ting, Xiao You-tao, Pu Jun, XU Ming, XIANG Chun Lang, GUO Xiao-yang. Effects of Al2O3Micro Powder Additive Amount on Characteristics of Micro-arc Oxidation Coating Formed on Magnesium Alloy[J]. Rare Metal Materials and Engineering,2017,46(5):1260~1264.]
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History
  • Received:January 05,2016
  • Revised:June 29,2016
  • Adopted:July 15,2016
  • Online: September 27,2017
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