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AZ31B鎂合金表面微弧電泳復(fù)合膜層微觀結(jié)構(gòu)及耐蝕性表征
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國(guó)家自然科學(xué)基金（51271144）；“十二五”國(guó)家科技支撐計(jì)劃（2011BAE22B05）


Microstructure and Corrosion Properties of Micro-Arc Oxidation Composite Electrophoretic Coating on AZ31B Magnesium Alloy
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    摘要:

    采用微弧氧化技術(shù)在AZ31B鎂合金表面制備陶瓷層，利用其表面多孔結(jié)構(gòu)借助電泳技術(shù)沉積有機(jī)膜層，對(duì)比研究陶瓷層和復(fù)合膜層表面粗糙度、表面及截面形貌、電化學(xué)性能及劃傷腐蝕特性。結(jié)果表明：陶瓷層表面放電微孔被電泳層完全填充并形成均勻膜層，復(fù)合膜層表面粗糙度明顯降低；微弧電泳復(fù)合膜層腐蝕電流密度與陶瓷層和基體相比分別降低2個(gè)和4個(gè)數(shù)量級(jí)，極化電阻分別增大2個(gè)和4個(gè)數(shù)量級(jí)，腐蝕傾向降低；微弧電泳復(fù)合膜層電化學(xué)阻值與陶瓷層相比增加4個(gè)數(shù)量級(jí)，同時(shí)電容值降低4個(gè)數(shù)量級(jí)，耐蝕性顯著提高；由于陶瓷層與電泳層的機(jī)械嵌合作用，復(fù)合膜層劃傷腐蝕過(guò)程表現(xiàn)為基體腐蝕及陶瓷層與基體界面的破壞，復(fù)合膜層界面處結(jié)合完好。

    Abstract:

    Porous ceramic layers were prepared on AZ31B magnesium alloy by Micro-arc Oxidation (MAO), and then electrophoretic coat (E-coat) was deposited on MAO coated Mg alloy. The surface roughness, surface and cross section morphologies, electrochemical properties and scribed corrosion properties of the MAO layer and MAO composite electrophoretic (MAOE) coating were studied. The results indicate that the discharge channels on surface of MAO layer are completely covered by E-coat and the surface of MAOE coating is very smooth; as a result, the surface roughness decreases obviously. The corrosion current density of MAOE coating is two and four orders of magnitudes lower than that of MAO layer and bare Mg alloy, respectively, and the polarization resistance is two and four orders of magnitudes higher, respectively, suggesting that the corrosion trend decreases. The EIS resistance of MAOE coating is four orders higher than that of MAO layer while the EIS capacitance is four orders lower, and thus the corrosion resistance is improved uncommonly. Due to the mechanical interlock between the MAO layer and E-coat, the substrate is corroded seriously during scribed corrosion test, and the coating delaminating at the interface of MAO layer and substrate also occur. However the interface of MAOE composite coating is still compact.

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時(shí)惠英,董利芳,蔣百靈,沈文寧,葛延峰. AZ31B鎂合金表面微弧電泳復(fù)合膜層微觀結(jié)構(gòu)及耐蝕性表征[J].稀有金屬材料與工程,2015,44(7):1679~1684.[Shi Huiying, Dong Lifang, Jiang Bailing, Shen Wenning, Ge Yanfeng. Microstructure and Corrosion Properties of Micro-Arc Oxidation Composite Electrophoretic Coating on AZ31B Magnesium Alloy[J]. Rare Metal Materials and Engineering,2015,44(7):1679~1684.]
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  • 收稿日期:2014-07-20
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  • 在線發(fā)布日期: 2016-01-04
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