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首页> 外文期刊>Applied Surface Science >Microstructure characteristic of ceramic coatings fabricated on magnesium alloys by micro-arc oxidation in alkaline silicate solutions
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Microstructure characteristic of ceramic coatings fabricated on magnesium alloys by micro-arc oxidation in alkaline silicate solutions

机译：碱性硅酸盐溶液中微弧氧化在镁合金上制备陶瓷涂层的微观结构特征

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摘要

Micro-arc oxidation (MAO) of AZ31B magnesium alloys was studied in alkaline silicate solutions at constant applied current densities. The microstructure, phase composition and elemental distribution of ceramic coatings were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDX). There are two inflections in the voltage-time response, three regions were identifiable and each of the regions was almost linear. The pores with different shapes distributed all over the coating surface, the number of the pores was decreasing, while the diameter was apparently increasing with prolonged MAO treatment time. There were also cracks on the coating surface, resulting from the rapid solidification of the molten oxide. The ceramic coating was comprised of two layers, an outer loose layer and an inner dense layer. The ceramic coating was mainly composed of forsterite phase Mg2SiO4 and MgO; the formation of MgO was similar to conversional anodizing technology, while formation of Mg2SiO4 was attributed to high temperature phase transformation reaction. Presence of Si and O indicated that the electrolyte components had intensively incorporated into coatings. (c) 2005 Elsevier B.V. All rights reserved.
机译：在恒定施加电流密度下，在碱性硅酸盐溶液中研究了AZ31B镁合金的微弧氧化（MAO）。使用扫描电子显微镜（SEM），X射线衍射（XRD）和能量色散光谱（EDX）研究了陶瓷涂层的微观结构，相组成和元素分布。电压-时间响应中有两个拐点，可以识别三个区域，每个区域几乎都是线性的。随着MAO处理时间的延长，不同形状的孔分布在整个涂层表面，孔的数量减少，而直径明显增加。由于熔融氧化物的快速凝固，在涂层表面上也有裂纹。陶瓷涂层包括两层，外部疏松层和内部致密层。陶瓷涂层主要由镁橄榄石相Mg2SiO4和MgO组成。 MgO的形成与转化阳极氧化技术相似，而Mg2SiO4的形成归因于高温相变反应。 Si和O的存在表明电解质组分已经强烈地结合到涂层中。 （c）2005 Elsevier B.V.保留所有权利。

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