Composition of highly concentrated silicate electrolytes and ultrasound influencing the plasma electrolytic oxidation of magnesium
Composition of highly concentrated silicate electrolytes and ultrasound influencing the plasma electrolytic oxidation of magnesium
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DOI：
10.1088/1757-899x/181/1/012040
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发表时间：
2017-03
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影响因子：
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通讯作者：
F. Simchen;Lisa-Marie Rymer;M. Sieber;T. Lampke
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文献类型：
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作者：
F. Simchen;Lisa-Marie Rymer;M. Sieber;T. Lampke
镁及其合金越来越多地用作轻质建筑材料。然而，它们不适当的耐腐蚀性和耐磨性常常妨碍它们的直接实际使用。等离子体电解氧化（PEO）是一种有前景的环保方法，通过形成氧化物涂层来改善镁材料的表面特性。这些 PEO 层包含所施加电解质的成分，并且可以通过增加电解质成分的浓度来改变其成分。因此，与使用传统的低浓度电解质相比，该工艺产生更稳定的保护涂层，其中电解质物质是主要成分。在本工作中，研究了含有磷酸盐和甘油添加剂的高浓度碱性硅酸盐电解质的组成对镁合金AZ31上PEO层质量的影响。还考虑了耦合到电解质浴中的超声波的影响。通过用瞬态记录仪记录电过程变量并用相机观察样品表面的放电现象来监测该过程。该研究是在实验设计的基础上进行的。考虑了工艺参数变化对涂层厚度、硬度和耐腐蚀性的影响。有关参数对所考虑属性的影响的统计显着性的信息通过方差分析 (ANOVA) 获得。
Magnesium and its alloys are increasingly in use as lightweight construction materials. However, their inappropriate corrosion and wear resistance often prevent their direct practical use. The plasma electrolytic oxidation (PEO) is a promising, environmentally friendly method to improve the surface characteristics of magnesium materials by the formation of oxide coatings. These PEO layers contain components of the applied electrolyte and can be shifted in their composition by increasing the concentration of the electrolyte constituents. Therefore, in contrast to the use of conventional low concentrated electrolytes, the process results in more stable protective coatings, in which electrolyte species are the dominating constitutes. In the present work, the influence of the composition of highly concentrated alkaline silicate electrolytes with additives of phosphate and glycerol on the quality of PEO layers on the magnesium alloy AZ31 was examined. The effect of ultrasound coupled into the electrolyte bath was also considered. The process was monitored by recording the electrical process variables with a transient recorder and by observation of the discharge phenomena on the sample surface with a camera. The study was conducted on the basis of a design of experiments. The effects of the process parameter variation are considered with regard to the coatings thickness, hardness and corrosion resistance. Information about the statistical significance of the effects of the parameters on the considered properties is obtained by an analysis of variance (ANOVA).