电参数对AZ31B镁合金微弧氧化膜微观形貌及耐蚀性的影响

doi:10.11902/1005.4537.2013.233

中国腐蚀与防护学报

2014, Vol. 34

Issue (6): 495-501 DOI: 10.11902/1005.4537.2013.233

本期目录 | 过刊浏览

电参数对AZ31B镁合金微弧氧化膜微观形貌及耐蚀性的影响

崔学军^1,²(

), 王荣², 魏劲松², 白成波², 林修洲^1,²

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

Effect of Electrical Parameters on Micromorphology and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg Alloy

CUI Xuejun^1,²(

), WANG Rong², WEI Jinsong², BAI Chengbo², LIN Xiuzhou^1,²

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

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摘要:

在含有丙三醇的硅酸盐体系中,通过微弧氧化法在AZ31B镁合金表面获得了细致均匀微孔的氧化膜。以SEM、电化学工作站和测厚仪为表征手段,利用单因素法分别考察了恒压模式下电压、频率、占空比对氧化膜结构、耐蚀性及厚度的影响。结果表明：随电压的增加,氧化膜的表面微孔尺寸和厚度均增大,但膜层耐蚀性能先增加后降低；随频率的增加,膜表面微孔尺寸减小,耐蚀性能增大,但频率改变对膜层的厚度影响较小；当占空比>45%时,膜层的表面微孔尺寸及厚度有增大趋势,膜层表面出现击穿破坏而导致耐蚀性能降低。优化的电参数为：电压230~260 V,频率300~500 Hz,占空比30%~45%。

关键词 ：镁合金, 微弧氧化, 电参数, 耐蚀性

Abstract：

A micro-arc oxidation coating containing uniformly distributed fine pores was obtained on AZ31B Mg alloy in a glycerol containing silicate aqueous solution. The effect of electrical parameters, such as voltage, frequency and duty cycle on the micromorphology, corrosion resistance and thickness of the micro-arc oxidation (MAO) coating was investigated by means of scanning electron microscope (SEM), electrochemical workstation and thickness gauge. The results show that the size of micro-pores and the thickness of MAO coating increase accordingly with the increasing voltage, while the corrosion resistance first increases and then decreases. However, the diameter of micros-pores decreases with the increasing frequency while corrosion resistance increases; the frequency has a weak effect on the thickness of the coating; when the duty cycle is larger than 45%, the size of micro-pores and thickness are apt to increase while the corrosion resistance decreases due to the breakdown and damage of MAO coating. The optimal electrical parameters for obtaining an excellent MAO coating are voltage 230~260 V, frequency 300~500 Hz and duty cycle 30%~45%.

Key words： magnesium alloy micro-arc oxidation electrical parameter corrosion resistance

ZTFLH:

TG174

基金资助:四川省教育厅重点项目 (12ZA261),材料腐蚀与防护四川省重点实验室开放基金项目 (2013CL01),四川理工学院人才引进基金项目 (2014RC18) 和四川理工学院大学生创新基金项目资助

作者简介: null

崔学军，男，1978年生，博士，副教授，研究方向为功能涂层及镁合金的腐蚀防护

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引用本文:

崔学军, 王荣, 魏劲松, 白成波, 林修洲. 电参数对AZ31B镁合金微弧氧化膜微观形貌及耐蚀性的影响[J]. 中国腐蚀与防护学报, 2014, 34(6): 495-501.
Xuejun CUI, Rong WANG, Jinsong WEI, Chengbo BAI, Xiuzhou LIN. Effect of Electrical Parameters on Micromorphology and Corrosion Resistance of Micro-arc Oxidation Coating on AZ31B Mg Alloy. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 495-501.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.233 或 https://www.jcscp.org/CN/Y2014/V34/I6/495

图1 不同电压下获得的MAO膜的表面形貌

图2 MAO膜层厚度与电压的关系

图3 不同电压下获得的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参数值

图4 不同频率下获得的MAO膜的表面形貌

表2 与图6极化曲线相对应的拟合电参数值

图5 MAO膜层的厚度与频率的关系

图6 不同频率下获得的MAO样品在3.5%NaCl溶液中的极化曲线

图7 不同占空比下获得的MAO膜的表面形貌

图8 MAO膜层的厚度与占空比的关系

图9 不同占空比下获得的MAO样品在3.5%NaCl溶液中的极化曲线

表3 与图9极化曲线相对应的拟合电参数值

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