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在含有纳米TiO_2的电解液中对铝合金进行微弧氧化处理,用以研究掺杂纳米TiO_2对铝合金微弧氧化成膜机理及性能的影响。利用扫描电镜(SEM)观察微弧氧化膜形貌,能谱仪(EDS)分析膜层Ti、Al、O等元素含量,X射线衍射仪(XRD)分析相组成,测定膜厚、硬度和氧化液中TiO_2表面电荷,建立了掺杂改性模型。结果表明,加入纳米TiO_2后,氧化初期电压随TiO_2添加量增加逐渐升高、5min后电压逐渐降低;氧化膜表面孔洞数量和尺寸减小,成膜效率、膜层致密度和表面疏松层硬度提高。纳米TiO_2在氧化膜表面均匀分布,截面不均匀分布。氧化膜主要由γ-Al_2O_3、Mullite和少量Si组成。
The micro-arc oxidation of aluminum alloy was carried out in the electrolyte containing nano-TiO_2 to study the effect of nano-TiO_2 on the micro-arc oxidation film formation mechanism and properties of aluminum alloy. The morphology of MAO coatings was observed by scanning electron microscopy (SEM), the content of Ti, Al, O and other elements were analyzed by energy dispersive spectrometer (EDS) and the phase composition was analyzed by X-ray diffraction (XRD) Liquid surface charge of TiO_2, a doping modified model was established. The results show that the initial voltage increases with the addition of TiO 2 and the voltage decreases gradually after 5 min. The number and size of pores in the oxide film decrease, the film formation efficiency, the film density and the surface loose layer hardness increase . Nano-TiO 2 is uniformly distributed on the surface of the oxide film and the cross-section is unevenly distributed. The oxide film mainly consists of γ-Al 2 O 3, Mullite and a small amount of Si.