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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Na2SiO3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-Al2O3与γ-Al2O3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Na2SiO3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。
The phase composition, microstructure and microstructure of 6063 aluminum alloy micro-arc oxidation ceramic coating were studied by means of X-ray diffraction (XRD), scanning electron microscope (SEM), microhardness tester and friction and wear tester. Micro-hardness, wear resistance and other effects. The results show that the electrolyte concentration has a great influence on the performance of the coating. When the concentration of Na2SiO3 is less than 9 g / L, the deposition rate increases with the increase of electrolyte concentration and the diffraction of α-Al2O3 and γ-Al2O3 phases in the coating under certain current density and processing time. The peak is obviously enhanced, the binding force between the coating and the substrate is increased, and the hardness and abrasion resistance of the coating are also greatly improved; however, the hardness of the coating basically does not change when the concentration of Na2SiO3 is greater than 9g / L , Even declined.