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中文摘要：
采用微弧氧化技术，通过自制的微弧氧化设备在铸造铝铜合金基体表面制备一层优质的强化陶瓷膜层，并借助覆层测厚仪、显微硬度仪、扫描电镜（SEM）、X射线衍射仪（XRD）、电化学工作站和数控磨损试验机等分析手段，探究在硅酸盐电解液中复合加入纳米二氧化钛和硝酸镧对该微弧氧化陶瓷膜层厚度、硬度、耐腐蚀性、耐磨性及微观结构、相组成、元素分布的影响。结果表明，硅酸盐电解液中复合加入纳米二氧化钛和硝酸锕时，制得陶瓷膜层含有Ti和La元素，说明加入电解液中的n—TiO2和La（NO3）3参与并促进了微弧氧化反应；所制得膜层的致密度提高，微观缺陷减少，膜层中增加了金红石（futile）和SiO2新相，且α-Al2O3相和γ-Al2O3相增多，使得膜层的综合性能得以提高。当纳米Ti02为3g·L^-1，La（NO3）3为0．5g·L^-1时，膜层耐磨性能、耐腐蚀性能较好，膜层厚度达71μm，硬度为HV689。
英文摘要：
Using micro-arc oxidation technology, a layer of high-quality reinforced ceramic membrane layer was performed on the surface of the casting aluminum copper alloy by the autonomous equipment of micro-are oxidation. The impacts of compound additive nanometer titanium dioxide and lanthanum nitrate added to the silicate electrolyte on the thickness, hardness, corrosion resistance, abrasion resistance and the mierostrueture, phase composition and the elements distribution of micro-arc oxidation ceramic membrane layer were explored by the means of coating thickness gauge, micro-hardness tester, scanning electron microscopy （ SEM ） , X-ray diffraction （XRD）, electrochemical workstation, digital controlled wear testing machine. The results showed that the ceramic membrane layer contained Ti and La elements when eompositing nanometer titanium dioxide and lanthanum nitrate were added to the silicate electrolyte, which indicated that n-TiO2 and La（ NO3 ）3 participated in and promoted the micro-arc oxidation reaction, the membrane layer density increased and the micro defects were reduced, the new phase rutile and SiO2 were found in the membrane layer, and α-Al2O3and γ-Al2O3 phase increased, improving the film comprehensive performance. When the content of nano-Ti02 was 3 g·L^-1and La（ NO3 ）3 was 0.5 g·L^-1, the coating had good wear resistance, corrosion resistance, and the membrane thickness and hardness reached to 71 txm and HV 689, respectively.
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