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镁合金表面微弧氧化-SiO2复合膜层的微观结构和耐蚀性
引用本文:葛延峰,蒋百灵,李育磊,杨志远.镁合金表面微弧氧化-SiO2复合膜层的微观结构和耐蚀性[J].材料研究学报,2011,25(1):79-83.
作者姓名:葛延峰  蒋百灵  李育磊  杨志远
作者单位:西安理工大学材料科学与工程学院 西安 710048
基金项目:国家自然科学基金51071121资助项目。
摘    要:采用有机醇盐水解法制备SiO2溶胶,用浸溃-提拉制膜技术在AZ31B镁合金微弧氧化陶瓷层表面制备SiO2膜层,研究了镁合金表面微弧氧化-SiO2复合膜层的微观结构和耐蚀性.结果表明:SiO2溶胶进入微弧氧化陶瓷层表面的微孔并形成了SiO2膜层;由微弧氧化陶瓷层和SiO2膜层组成的复合膜层的腐蚀电位比单一陶瓷层明显提高,...

关 键 词:材料失效与保护  镁合金  微弧氧化  SiO2溶胶  复合膜层  耐蚀性
收稿时间:2010-06-21
修稿时间:2010-12-07

Microstructure and Corrosion Resistance of Composite Micro-arc Oxidation and SiO_2 Coatings on Magnesium Alloy
GE Yanfeng JIANG Bailing LI Yulei YANG Zhiyuan.Microstructure and Corrosion Resistance of Composite Micro-arc Oxidation and SiO_2 Coatings on Magnesium Alloy[J].Chinese Journal of Materials Research,2011,25(1):79-83.
Authors:GE Yanfeng JIANG Bailing LI Yulei YANG Zhiyuan
Affiliation:Material Science and Engineering, Xi‘an University of Technology, Xi'an 710048
Abstract:SiO2 sol was prepared by hydrolyzing of organic alkoxide, and the dipping–costing method was employed to prepare the SiO2 layer onto micro–arc oxidation(MAO) coating of AZ31B magnesium alloy. The sol structure, differences in micro–morphology and corrosion resistance between ceramic coating and composite coatings were investigated. The results show that SiO2 sol immersed into the micro pores on the surface of MAO coating and formed an inorganic SiO2 layer. The corrosion potential of composite coatings which composed of ceramic coating and SiO2 layer increased, and the corrosion current density reduced by about 2 orders of magnitude comparing with the ceramic coating. The molar ratio of TEOS to H2O affects the structure of SiO2 layer seriously and the action of suppressing the corrosion medium of SiO2 layer.
Keywords:materials failure and protection  magnesium alloy  MAO  SiO2 sol  composite coatings  corrosion resistance
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