采用X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计、摩擦磨损试验机等手段研究了不同电解液浓度对6063铝合金微弧氧化陶瓷涂层的相组成、微观结构、显微硬度、耐磨性能等的影响.结果表明:电解液浓度对涂层的性能有着较大的影响.电流密度和处理时间一定的条件下,当Na_2SiO_3的浓度小于9 g/L时,随着电解液浓度的增大,成膜速率有所提高,涂层中α-Al_2O_3与γ-Al_2O_3相的衍射峰明显增强,涂层与基体的结合力增大,且涂层的硬度和耐磨性也有很大的提高;但是当Na_2SiO_3的浓度大于9g/L时,涂层的硬度等性能基本不再变化,甚至有所下降.
Effects of Na_2SiO_3 concentration of electrolyte on phases, microstructure, microhardness and wear resistance of the ceramic coatings prepared by micro-arc oxidation on 6063 aluminum alloy were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), hardness measurement and wear test. The results show that the electrolyte concentration greatly influences the properties of the ceramic coatings. The intensity of α-Al_2O_3 and γ-Al_2O_3 diffraction peaks, the bonding strength between substrate and coatings, microhardness and wear resistance of the coatings increase obviously with increasing the electrolyte concentration of Na_2SiO_3 when the concentration is less than 9 g/L under constant oxidation time and current density, however, no significant changes in mechanical properties of the ceramic coatings are observed when the concentration of Na_2SiO_3 is more than 9 g/L.
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