负向电压对AZ31B镁合金表面微弧氧化膜结构和耐蚀性的影响

doi:10.11902/1005.4537.2015.061

中国腐蚀与防护学报

2016, Vol. 36

Issue (2): 137-142 DOI: 10.11902/1005.4537.2015.061

本期目录 | 过刊浏览

负向电压对AZ31B镁合金表面微弧氧化膜结构和耐蚀性的影响

崔学军(

),李晓飞,李特,林修洲

四川理工学院材料科学与工程学院材料腐蚀与防护四川省重点实验室自贡 643000

Negative Voltage on Structure and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Magnesium Alloy

Xuejun CUI(

),Xiaofei LI,Te LI,Xiuzhou LIN

Material Corrosion and Protection Key Laboratory of Sichuan Province, College of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, China

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摘要:

以Na₂SiO₃-NaOH-NaF溶液为电解液,采用双极性非对称脉冲电源的恒压加载方式,制备AZ31B镁合金表面微弧氧化膜。以扫描电镜和极化曲线为表征手段,研究在固定正向电压 (260 V) 条件下,负向电压对膜层形貌及腐蚀性能的影响。结果表明：负向电压40 V,氧化处理10~15 min,可获得致密层较厚的耐蚀微弧氧化膜;负向电压高于60 V,膜层容易烧蚀,表面产生大尺寸微裂纹,导致膜层耐蚀性能降低。适当的负向电压能够显著提高膜层的致密性,但必需控制电压的范围和氧化处理的时间。

关键词 ：镁合金, 微弧氧化, 负向电压, 耐蚀, 致密性

Abstract：

Micro-arc oxidation (MAO) coatings were fabricated on AZ31B Mg-alloy in a Na₂SiO₃-NaOH-NaF aqueous solution by varying applied negative voltages with a bipolar asymmetric pulsing power. Then the effect of the applied negative voltage on the microstructure and corrosion resistance of MAO coatings were studied by SEM and polarization curves. The results show that a corrosion resistant coating can be obtained by an applied negative voltage 40 V for a duration 10~15 min. However, the surface morphology of the MAO coating exhibited obviously many micro-cracks when the applied negative voltage is above 60 V, resulting in a poor corrosion resistance. Therefore, the value of the negative voltage and the oxidation time should be carefully matched so that to prepare a MAO coating with appropriate compactness and corrosion resistance.

Key words： magnesium alloy micro-arc oxidation negative voltage corrosion resistance compactness

基金资助:四川省教育厅重点项目 (16ZA0244),自贡市科技创新苗子工程 (2015CXM02) 和材料腐蚀与防护四川省重点实验室开放基金项目 (2013CL01) 资助

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引用本文:

崔学军,李晓飞,李特,林修洲. 负向电压对AZ31B镁合金表面微弧氧化膜结构和耐蚀性的影响[J]. 中国腐蚀与防护学报, 2016, 36(2): 137-142.
Xuejun CUI, Xiaofei LI, Te LI, Xiuzhou LIN. Negative Voltage on Structure and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Magnesium Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 137-142.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.061 或 https://www.jcscp.org/CN/Y2016/V36/I2/137

图1 不同负向电压下MAO膜的表面形貌

图2 不同负向电压下MAO膜的截面形貌

图3 不同负向电压下MAO样品在3.5%NaCl溶液中的极化曲线

表1 与图3极化曲线相对应的拟合电化学参数值

图4 40 V负向电压下处理不同时间MAO样品在3.5% NaCl溶液中的极化曲线

表2 与图4极化曲线相对应的拟合电化学参数值

图5 氧化10 min 形成的MAO膜的厚度随负向电压变化的曲线

图6 40 V负向电压下氧化时间对MAO膜厚的影响

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