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利用自制多功能微弧氧化(MAO)电源,在保持电学参数和处理时间不变的条件下对TC4钛合金表面进行了MAO处理,研究了Al(OH)3溶胶浓度对钛合金MAO膜的生长特性、微观结构、相结构和电致变色特性的影响.结果表明:随着Al(OH)3溶胶浓度(体积分数)C的增加,膜层的生长速率由慢到快逐渐增加,膜表面微孔尺寸和粗糙度逐渐增大,而微孔密度逐渐减小;当C≤10%时,膜层由锐钛矿相TiO2组成,而当C>10%时,膜层中开始出现金红石相TiO2并随着C的增加其相对含量逐渐增大,并在C=40%时,膜层全部由金红石相TiO2组成;在pH=2.0的HCl溶液中的循环伏安测试结果表明,C≤20%制备试样的膜层颜色变化不明显,随着C的进一步增加,制备试样的膜层颜色变化逐渐明显,并在C=40%时,其着色呈蓝色且色泽均匀;该试样在循环伏安测试过程中还表现出了良好的稳定性和可逆性.
The surface of TC4 titanium alloy was treated with MAO under the condition of keeping the electrical parameters and processing time constant by self-made micro-arc oxidation (MAO) power supply. The effects of Al (OH) 3 sol concentration on the growth of MAO film The microstructure, phase structure and electrochromic properties of the films were investigated. The results show that the growth rate of the films increases from slow to fast with the increase of the concentration of Al (OH) 3 sol, The pore size and roughness gradually increase, while the micropore density decreases gradually; when C≤10%, the film consists of anatase phase TiO2, and when C> 10%, rutile begins to appear in the film The relative content of TiO2 increased with the increase of C, and all the films consisted of rutile TiO2 at C = 40%. The cyclic voltammetry in HCl solution with pH = 2.0 showed that C≤ The color change of the film of 20% prepared sample is not obvious. With the further increase of C, the color change of the film of the prepared sample becomes obvious, and the coloring is blue and the color is uniform at C = 40% In the cyclic voltammetry test also showed good stability and reversibility.