纳米Al<sub>2</sub>O<sub>3</sub>掺杂AZ31B镁合金表面微弧氧化膜的结构与性能

doi:10.11902/1005.4537.2015.035

中国腐蚀与防护学报

2016, Vol. 36

Issue (1): 73-78 DOI: 10.11902/1005.4537.2015.035

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纳米Al₂O₃掺杂AZ31B镁合金表面微弧氧化膜的结构与性能

崔学军(

),杨瑞嵩,李明田

四川理工学院材料与化学工程学院材料腐蚀与防护四川省重点实验室自贡 643000

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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摘要:

通过超声辅助微弧氧化的方法,在掺杂纳米Al₂O₃颗粒的硅酸盐溶液中制备AZ31B镁合金表面耐蚀耐磨涂层.采用SEM和XRD表征涂层的表面/截面形貌及物相组成,利用电化学方法考察基体及涂层样品在3.5%NaCl溶液中的腐蚀行为,利用球-盘干磨损实验考察膜层的室温摩擦磨损行为.结果表明:与改性前相比,掺杂Al₂O₃颗粒可提高陶瓷膜致密性,并促进膜层生长,表面微孔分布更均匀,尺寸更小,其物相组成主要包括MgO,MgSiO₃和Al₂O₃;膜层的I_corr降低了一个数量级;在5和10 N载荷下的摩擦系数最低.Al₂O₃颗粒在超声分散和微弧的高温高压作用下,弥散分布于氧化膜及微孔内部,膜层致密化及纳米颗粒的"滚动效应"增强了膜层对基体的耐蚀耐磨防护性能.

关键词 ：镁合金, 微弧氧化, 纳米Al2O3, 耐蚀, 耐磨

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.

Key words： magnesium alloy micro-arc oxidation nano-Al2O3 corrosion resistance wearresistance

基金资助:四川省教育厅重点项目 (16ZA0244),国家级大学生创新创业训练计划项目 (201410622022) 和自贡市科技创新苗子工程项目 (2015CXM02) 资助

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引用本文:

崔学军,杨瑞嵩,李明田. 纳米Al₂O₃掺杂AZ31B镁合金表面微弧氧化膜的结构与性能[J]. 中国腐蚀与防护学报, 2016, 36(1): 73-78.
Xuejun CUI, Ruisong YANG, Mingtian LI. Structure and Properties of a Micro-arc Oxidation Coating Coupled with Nano-Al₂O₃ Particles on AZ31B Magnesium Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 73-78.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.035 或 https://www.jcscp.org/CN/Y2016/V36/I1/73

图1 掺杂Al2O3前后微弧氧化膜的表面形貌

图2 掺杂Al2O3前后微弧氧化膜的截面形貌

图3 掺杂Al2O3前后微弧氧化膜的XRD谱

图4 空白基体和微弧氧化处理样品在3.5%NaCl溶液中的极化曲线

图5 掺杂Al2O3前后的微弧氧化膜在干摩擦条件下摩擦系数与磨损时间的关系

表1 图4极化曲线拟合获得的电化学参数

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