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Mg-Gd-Y系合金微弧氧化層生長機制及耐蝕性研究
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Growth Mechanism and Corrosion Resistance of Micro-arc Oxidized Coating of Mg-Gd-Y Alloy
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    摘要:

    利用掃描電鏡（SEM）、X射線衍射（XRD）等分析手段，研究Mg-11Gd-1Y-0.5Zn合金微弧氧化陶瓷層的生長規(guī)律，分析微弧氧化膜層相結(jié)構(gòu)及不同生長階段的耐蝕性。結(jié)果表明，在微弧氧化初期，膜層生長遵循直線規(guī)律，為典型的電化學極化控制的陽極沉積階段；隨處理時間的延長及膜層增厚，膜層生長符合拋物線規(guī)律，屬微弧氧化階段，較氧化初期相比，生長速率慢；在弧光放電階段，拋物線斜率增大，疏松層增厚，生長速率有所提高。微弧氧化疏松層主要以MgSiO3為主，致密層以MgO為主；微弧氧化各階段，膜層耐蝕性隨氧化時間增長而提高，到弧光放電階段，耐蝕性有所降低。在7~12 min時，膜層具有較好的耐蝕性。

    Abstract:

    A Mg-11Gd-1Y-0.5Zn(wt%) alloy was coated by different micro-arc oxidation (MAO) processes, and the coating structure and corrosion resistance of the alloy were studied by scanning electron microscopy (SEM), glancing angle X-ray diffraction (GAXRD) and various electrochemical methods. The micro-arc oxidation process used for the alloy consists of 3 stages, corresponding with different coating structures. In the initial stage, the coating thickness is linearly increased and controlled by electrochemical polarization. In the second stage, the coating is mainly inward growth and accords with parabolic regularity. In the third stage, the loose coating is formed and controlled by local arc light. The loose coating is mainly composed of MgSiO3 and the compact coating is mainly of MgO. From the stage of micro-arc oxidation to that of local arc light, the corrosion resistance of the coated alloy is firstly increased and then decreased. The satisfied corrosion resistance corresponds to the coating time ranging from 7 to12 min.

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王 萍,劉道新,李建平,楊 忠,郭永春. Mg-Gd-Y系合金微弧氧化層生長機制及耐蝕性研究[J].稀有金屬材料與工程,2011,40(6):995~999.[Wang Ping, Liu Daoxin, Li Jianping, Yang Zhong, Guo Yongchun. Growth Mechanism and Corrosion Resistance of Micro-arc Oxidized Coating of Mg-Gd-Y Alloy[J]. Rare Metal Materials and Engineering,2011,40(6):995~999.]
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  • 收稿日期:2010-06-24
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