Ti-Al层状复合电极材料制备工艺与性能的研究

【作者】 杨秀琴；

【导师】 竺培显；

【作者基本信息】 昆明理工大学 ， 材料学， 2010， 硕士

【摘要】 电极是湿法电解冶金和电化学工业(氯碱工业、海水电解污水处理、电镀、有机电合成等)重要的装备器件,电极材料的选择直接关系到电解和电化学过程的稳定性、产品的产率和质量、运行成本、电能消耗和对周边环境的污染性等。因此,电极材料一直是该领域关注的研究热点。目前应用于有色金属提取工业的不溶性阳极主要有铅基合金阳极和涂层钛电极(以下简称钛阳极)。钛阳极与铅基合金电极相比,具有尺寸稳定、析氯析氧过电位低、耐蚀性好、质量轻、强度高等优点,自1965年问世以来,钛阳极迅速成功地应用与氯碱工业、被誉为氯碱工业的一项重大技术革命。然而,目前对钛阳极的研究仅限于涂层配方、制备工艺、涂层结构设计、涂层电极应用方面,虽然取得了一定的研究成果。但是,钛阳极基体材料电阻率大,造成电极电位高、表面电势分布不均匀的弱点成为进一步提高钛阳极综合性能的主要瓶颈。本文从电极基体材料内部的组成结构入手,改变传统电极基体材料结构模式,提出铝为内芯、外层由钛包覆的层状复合结构基体材料设计方案。其技术思想是：电极内芯有效利用铝的优良导电性,将起到降低内阻、均化电流分布的作用,外层采用钛包覆,仍保持原有的电化学性质。通过阅读相关文献,对Ti-Al的复合采用了镀覆法、真空上引法、热压扩散焊等制备方法,成功的制备出了Ti-Al层状复合电极材料,利用扫描电子显微镜、能谱仪、电化学工作站等分析测试手段,对Ti-A1层状复合电极材料的界面和性能进行表征。研究结果表明三种方法均能制备出Ti-Al层状复合材料,并使Ti与Al实现了冶金式结合；同时制备出的Ti-A1层状复合材料实现冶金式结合的情况下,与纯Ti相比,电阻明显降低,降幅达50%-90%；电化学性能明显提高,在同一电极电位下,极化电流大于纯Ti基阳极,且制备工艺条件对电化学性能的影响与对电阻率的影响是一致的。这也说明金属基体的导电性能将直接影响着电极材料的电化学催化性能,因此,改变电极基体材料的组成结构不但降低了电阻成本、改善了电极的性能、也达到了节能降耗的目的。更多还原

【Abstract】 The electrode is the most important equipment component in the area of hydrometallurgy and the electrochemistry industry (chlorine alkali industry, sea water electrolysis sewage treatment, galvanization, organic electro-synthesis and so on), electrode material choice directly relative to the reaction stability of electrolysis and electrochemical, the production rate and the quality, the run cost, the electrical energy consumption, the peripheral environment pollution, and so on. Therefore, the electrode material is a hot spot of this research domain.At present, in the non-ferrous metal extraction industry, the insoluble electrode mainly used the lead base alloy electrode and the coating titanium electrode (titanium anode). Compared to lead base alloy electrode, titanium anode has the higher size stably, lower chlorine and oxygen evolution potential, good corrosion resistance, light quality and higher strength.Since been published by 1965, the titanium anode applies in chlorine alkali industry successfully rapidly and be honored as a significant technological revolution of the chlorine alkali industry. However, Existing research was only restricted in the coating formula, the preparation technology, the coating structural design, the coating electrode application aspect to the titanium anode’s research and obtain fruitful research result. But, the titanium anode matrix material electronic resistivity is big, cause electrode to high and surface potential distribution becomes non-uniform further enhances the main bottleneck of titanium anode overall performance.From the internal composition structure of the electrode matrix material, in order to change the tactic pattern of tradition electrode matrix material, the design proposal was proposed that the aluminum for in core, the outer layer by the titanium gable layered composite construction matrix material, which in the electrode the core as aluminum for fine electrical conductivity, to play an important part of reducing the interface resistance and the equalization current distribution, and the outer layer using the titanium gable, to still maintain the original electrochemistry nature. On the base of th related literature, Ti-Al layered composite electrode material was prepared by the means of Plating, Vacuum Upward, Hot-pressure welding and so on. And the interface and related properties of Ti-Al layered composite electrode material were studied by the means of SEM, EDS, electrochemistry workstation and so on.The results indicated that the Ti-Al layered compound material was prepared by the above three methods, and the metallurgy union was formed in the surface of Ti and Al; meanwhile, the resistance of it reduced by 50%-90% obviously and the electrochemistry performance distinct enhancement. under the identical electrode potential, the polarization current was bigger than the pure Ti base anode, and the preparation technological conditions to the electrochemistry performance’s influence with to the electronic resistivity the influence are consistent, which the electric conductivity of metal matrix influenced the electrochemistry catalysis performance of electrode material, therefore, the change of the electrode matrix material not only improved electrode’s performance, but also attained the purpose of saving energy and reducing consumption.更多还原