硫酸体系钛阳极氧化特性及影响因素的研究
发布时间：2018-12-17 14:14
【摘要】：为了满足钛及钛合金在航空航天、船舶制造、生物医学、生活等领域中的广泛应用,且减少由于腐蚀而产生的损耗,提高钛及钛合金的耐腐蚀性能及改善表面性能,达到高效性生产、长久性使用的目的,本文以TA2工业纯钛为实验样品,以0.5mol/L的硫酸为电解液,采用阳极氧化的表面改性处理方法,研究了阳极氧化的工艺流程及其影响参数,并且通过大量的实验确定了工艺参数电压、时间、温度对氧化膜层表面宏观特征、显微组织特性及耐腐蚀性能的影响。其次,在一次阳极氧化所得样品的基础上,再次施加高电压进行第二次阳极氧化,并且研究了经二次阳极氧化后试样的微观形貌特征、化学组成及耐蚀性能。阳极氧化工艺的实验结果表明:在优化的工艺参数和控制条件下,获得的TA2阳极氧化膜层能呈现五彩斑斓的颜色,且色泽均匀、鲜亮。膜层组织具有较好的稳定性,结构致密,且抗腐蚀性能得到显著的增强,阳极氧化在一定程度上实现了材料功能性与美观性的统一。此外,该工艺操作简单且极具效果,能满足金属表面阳极氧化改性处理及工程化实际生产应用的要求。阳极氧化工艺条件(电压、时间、温度)对着色膜层的性能起着非常重要的作用,其中电压是最重要的影响因素。随着电压的改变,氧化膜层的厚度发生变化,由于光的干涉作用使膜层色泽呈规律性的变化。在适当的时间和温度下,膜层表面随电压的升高变的更加致密、平整,并均匀的覆盖在基体上,对金属基体起着很好的保护作用,腐蚀介质由于由于膜层的屏障作用对金属的腐蚀能力减弱。在同样的电压和温度下,改变时间,膜层色泽率变化不大,但当时间超过30min,膜层会出现“起粉”现象,导致膜层色泽不均匀。当时间超过1Omin,膜层的致密度和耐腐蚀性会随着时间的延长下降。当温度超过40℃,膜层开始出现“起粉”现象,随着温度的继续升高,膜层表面微孔数量增多且耐腐蚀性能下降。当温度低于20℃,由于温度的降低会影响原子和离子的扩散速度,导致阳极氧化进程变得缓慢,效率降低。因此,可以得出最佳时间为5min-10min,最佳温度为20℃-30℃,对于电压可根据具体需要进行选择。对TA2工业纯钛进行恒电位模式二次阳极氧化,分别采用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)及电化学工作站研究膜层表面色泽、形貌特征、成分及其动电位极化曲线。研究结果表明:二次阳极氧化促使膜层在一次阳极氧化的基础上再次生长,导致膜层厚度增加,膜层色泽进一步加深。TA2工业纯钛经过阳极氧化所得到的氧化膜层均为多孔形貌,经二次阳极氧化后形成的膜层,表面形貌更加致密平整,微孔数量进一步减少;二次阳极氧化所获得的膜层较一次阳极氧化含有更多稳定性的金红石型TiO2,膜层表面活性降低,自腐蚀电流密度下降,耐腐蚀性得到较大的提升。
[Abstract]:In order to satisfy the extensive application of titanium and titanium alloys in aerospace, shipbuilding, biomedicine, life and other fields, and reduce the loss caused by corrosion, improve the corrosion resistance and surface properties of titanium and titanium alloys, To achieve the purpose of high efficiency production and long-term use, the surface modification method of anodic oxidation was adopted in this paper, in which TA2 industrial pure titanium was used as experimental sample and 0.5mol/L sulfuric acid as electrolyte. The technological process and its influence parameters of anodic oxidation were studied. The effects of process parameters, such as voltage, time and temperature, on the surface macroscopical characteristics, microstructure and corrosion resistance of the oxide film were determined by a large number of experiments. Secondly, on the basis of the sample obtained by primary anodization, the second anodization was carried out by applying high voltage again, and the microstructure, chemical composition and corrosion resistance of the sample after secondary anodization were studied. The experimental results of anodic oxidation process show that the TA2 anodic oxide film can show colorful color under the optimized process parameters and control conditions, and the color is uniform and bright. The structure of the film is relatively stable, the structure is compact, and the corrosion resistance is obviously enhanced. To some extent, the anodization realizes the unification of the functional and aesthetic properties of the material. In addition, the process is simple and effective, and can meet the requirements of anodic oxidation modification of metal surface and practical application of engineering. Anodic oxidation process conditions (voltage, time, temperature) play a very important role in the performance of colored film, among which voltage is the most important factor. The thickness of the oxide film changes with the change of voltage, and the color of the film changes regularly due to the interference of light. At the appropriate time and temperature, the film surface becomes denser, flatter, and more evenly covered on the substrate with the increase of voltage, which plays a good protective role on the metal substrate. The corrosion resistance of the corrosion medium to metals is weakened due to the barrier effect of the film. Under the same voltage and temperature, the color rate of the film will not change much when the time is changed, but when the time exceeds 30 min, the phenomenon of "powdering" will appear, which will lead to the uneven color of the film. When the time exceeds 1 O min, the density and corrosion resistance of the film will decrease with the prolongation of time. When the temperature is above 40 鈩，
本文编号：2384300
[Abstract]:In order to satisfy the extensive application of titanium and titanium alloys in aerospace, shipbuilding, biomedicine, life and other fields, and reduce the loss caused by corrosion, improve the corrosion resistance and surface properties of titanium and titanium alloys, To achieve the purpose of high efficiency production and long-term use, the surface modification method of anodic oxidation was adopted in this paper, in which TA2 industrial pure titanium was used as experimental sample and 0.5mol/L sulfuric acid as electrolyte. The technological process and its influence parameters of anodic oxidation were studied. The effects of process parameters, such as voltage, time and temperature, on the surface macroscopical characteristics, microstructure and corrosion resistance of the oxide film were determined by a large number of experiments. Secondly, on the basis of the sample obtained by primary anodization, the second anodization was carried out by applying high voltage again, and the microstructure, chemical composition and corrosion resistance of the sample after secondary anodization were studied. The experimental results of anodic oxidation process show that the TA2 anodic oxide film can show colorful color under the optimized process parameters and control conditions, and the color is uniform and bright. The structure of the film is relatively stable, the structure is compact, and the corrosion resistance is obviously enhanced. To some extent, the anodization realizes the unification of the functional and aesthetic properties of the material. In addition, the process is simple and effective, and can meet the requirements of anodic oxidation modification of metal surface and practical application of engineering. Anodic oxidation process conditions (voltage, time, temperature) play a very important role in the performance of colored film, among which voltage is the most important factor. The thickness of the oxide film changes with the change of voltage, and the color of the film changes regularly due to the interference of light. At the appropriate time and temperature, the film surface becomes denser, flatter, and more evenly covered on the substrate with the increase of voltage, which plays a good protective role on the metal substrate. The corrosion resistance of the corrosion medium to metals is weakened due to the barrier effect of the film. Under the same voltage and temperature, the color rate of the film will not change much when the time is changed, but when the time exceeds 30 min, the phenomenon of "powdering" will appear, which will lead to the uneven color of the film. When the time exceeds 1 O min, the density and corrosion resistance of the film will decrease with the prolongation of time. When the temperature is above 40 鈩，
本文编号：2384300
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