不同电解液中镁合金微弧氧化膜生长过程及腐蚀防护性能
Growth Process and Corrosion Resistance of Micro-Arc Oxide Coatings on Magnesium Alloy in Different Electrolytes
查看参考文献21篇
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文摘
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对AZ31镁合金在3种电解液(NaAlO_2,Na_2SiO_3,Na_3PO_4)中进行微弧氧化处理,采用扫描电子显微镜和X射线能谱仪分析了不同电解液体系下微弧氧化膜的表面和截面形貌及其元素分布情况,采用X射线衍射分析了微弧氧化膜生长过程中物相组成的变化情况,利用电动位极化、电化学阻抗和析氢测试比较了不同电解液体系中制备的相同厚度(~15 μm)氧化膜的腐蚀防护性能,并根据不同电解液体系中微弧氧化膜生长过程特点,探讨了氧化膜腐蚀防护性能差异的原因。结果表明:在铝酸盐中生长主要以阴离子化合物沉积为主,氧化膜倾向于向外生长,而在硅酸盐和磷酸盐中,这2种膜层的生长很大一部分来自于基体的氧化,导致其向内生长都占据了主要地位,不同的生长方式导致膜层对基体的腐蚀防护性能不同(AZ31-S>AZ31-P>>AZ31-Al)。 |
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其他语种文摘
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The growth processes (i.e.,growth rate,inward/outward growth and compositions)of micro-arc oxidation coatings formed on AZ31 Mg alloys in different electrolytes (i.e.,aluminate,silicate and phosphate,respectively)were investigated.The surface and cross-sectional morphologies with elemental distribution and the cross sections of the micro-arc oxidation coatings were characterized by scanning electron microscopy (SEM)with energy dispersive X-ray spectroscopy (EDS).The phase compositions of three micro-arc oxidation coatings with different coating thickness were determined by X-ray diffraction (XRD).The corrosion resistances of the micro-arc oxidation coatings were evaluated by electrochemical measurements and hydrogen evolution test.The growth processes in different electrolytes indicate the reasons for different anti-corrosion performances of the micro-arc oxidation coatings.The results show that the growth of micro-arc oxidation coating in aluminate is mainly due to the anionic compound deposition,and the coating grows outward,and the growth of the micro-arc oxidation coatings in silicate and phosphate is mainly due to the oxidation of the substrate,leading to the coating to grow inward.It is indicated that the growth processes of micro-arc oxidation coatings with 15 μm thickness in different electrolytes result in that different corrosion resistances (i.e.,AZ31-Si>AZ31-P>>AZ31-Al). |
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来源
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硅酸盐学报
,2021,49(6):1213-1221 【核心库】
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DOI
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10.14062/j.issn.0454-5648.20200530
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关键词
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镁合金
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微弧氧化
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电解液体系
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生长特点
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腐蚀防护性能
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地址
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1.
中国科学院兰州化学物理研究所, 固体润滑国家重点实验室, 兰州, 730000
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材料与光电研究中心, 中国科学院大学, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0454-5648 |
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学科
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金属学与金属工艺 |
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基金
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中科院兰州化学物理研究所"十三五""一三五"重点培育项目。
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文献收藏号
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CSCD:6996096
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