【作者】 李叶菊；

【导师】 于升学；

【作者基本信息】 燕山大学 ， 应用化学， 2010， 硕士

【摘要】 利用阳极氧化技术可以在钛金属表面获得色彩鲜艳、耐腐蚀性较好的膜层。在钛合金的阳极氧化过程中,通过改变阳极氧化的电压即能使阳极氧化膜呈现不同的颜色。本文主要研究了在硫酸体系电解液中添加Ce(SO4)2对装饰性钛合金彩色阳极氧化膜的影响。首先,本文研究了应用基础电解液进行钛合金阳极氧化的工艺条件,其最佳工艺条件为:10 g/L硫酸、3 g/L硫酸铵,氧化时间20 min,氧化温度15℃左右。在基础电解液及工艺条件的基础上,研究了Ce(SO4)2在钛合金阳极氧化中的作用。评价了Ce(SO4)2对氧化膜的外观和耐腐蚀性能的影响。应用阳极极化曲线和电位-时间曲线分析了氧化膜的成膜过程;用极化曲线、电化学阻抗谱和全浸试验评价了氧化膜的耐蚀性。研究结果表明:在电解液中加入稀土盐Ce(SO4)2比未加稀土盐所制备的氧化膜在其外观质量及耐蚀性都有提高,Ce(SO4)2的最佳含量为0.75 g/L。并用SEM、XRD及EDX分析了彩色阳极氧化膜的表面形貌和组织结构。SEM分析结果显示电解液中加入稀土盐Ce(SO4)2使氧化膜表面更平滑、均匀;EDS分析表明了加入Ce(SO4)2可以使钛合金表面氧化更为充分,但氧化膜中并未检出Ce元素;用XRD图谱分析表明,氧化膜的主要组成相为TiO2。更多还原

【Abstract】 Anodic oxidation coatings with bright colour and high corrosion resistance can be obtained on titanium using anodic oxidation technology. Different colors could appear on anodic oxidation coatings through changing anodic oxidation voltage in anodic oxidation process of titanium alloy. In this thesis, the influence of Ce(SO4)2 on ornamental Ti-alloy colorful anodic oxidation coatings in the vitriol electrolyte was researched.Firstly, the technological conditions of anodic oxidation coatings fabricated in basic electrolyte on titanium alloys were researched. The optimal technologcial conditions of anodic oxidation coatings fabricated in basic electrolyte were: 10 g/L vitriol acid, 3 g/L ammonium sulfate, the oxidation time was 20 min, the temperature was about 15℃.The effect of Ce(SO4)2 on Ti-alloy anodization was studied based on the research of basic electrolyte and technological conditions. The influence of Ce(SO4)2 on the appearance and corrosion resistance was evaluated. The oxidation process of the anodic oxidation coatings was analyzed by anodic polarization curves and potential-time curves. The corrosion resistance of the anodic oxidation coatings was evaluated by polarization curves、electrochemistry impendence spectrum and immersion test. The results showed that the oxidation coating formed in the electrolyte containing rare earth salt Ce(SO4)2 was better in the appearance and corrosion resistance than that formed in the electrolyte without rare earth salt. The optimum content of Ce(SO4)2 was 0.75 g/L. The surface morphology and phase composition of anodic oxidation coating were analyzed by SEM, XRD and EDX. The surface morphology was analyzed by SEM, it was shown that the surface by using rare-earth anodization was smoother and more symmetrical; With the EDS analysis of the film, it was shown that the oxidation of Ti-alloy surface was more sufficient by using rare-earth anodization than by the traditional oxidation, and there was not Ce element in the oxide film.;The structure of the oxide film was analyzed by means of XRD. The phase composition of oxidation film was TiO2。更多还原