Ionic Liquid Clp Research Of Sedimentary Ti - Al Alloy

Because of the light weight and heat-resistant, Titanium and its alloys have attracted much more attentions. They have so many advantages such as high strength, good corrosion resistance, heat resistance, no magnetic and so on. They have been widely used in many fields including military fields likes military aerospace, aviation, naval military and civil industry fields likes Petrochemical industry, pharmacy, light industry, salt, chemical industry, printing and dyeing, sea water desalination. Although there have been many industrial methods in producing Ti-Al alloys in recent years, these methods inevitably have some disadvantages such as high energy consumption, high cost, long process, environmental pollution and strong corrosive. It is an urgent task for scientists to explore a new way to produce economy, cost low no pollution Ti-Al alloys. The emergence of ionic liquids provide a chance to find green production methods for Ti-Al alloys.We have composed different molar fractions AICl3(xAlCl3)1-butyl-3-methyl imidazolium chloride-AlCl3(BMIC-AlCl3)ionic liquids. Whose structures have been showed by infrared spectrum, chemical and physical properties of each ionic liquids such as electric conductivity, cyclic voltammetry curves have also been measured.Ti-Al alloys have been electrodeposited based from these ionic iquids by taking constant current density methods. Infrared spectrum indicated that When0.50<zAlCl3<0.667, the absorption peaks of AICl4-were weakened and Al2Cl7-enhanced gradually with increasing molar fractions AlCl3. However, when xAlCl3>0.667,the absorption peaks of AlCl7-became slightly weaker. Through studied on influences of current efficiency, starting reduction potential, crystallization orientation, We found that the conductivity, cathodic current density and current efficiency increased reduced and starting reduction potential moved negatively with increasing of xAlCl3When0.50<xAlCl3<0.667. However, when xAlCl3>0.667, the conductivity, cathodic current density and current efficiency reduced increased and the starting reduction potential moved positively. Studied on Aluminum morphology, Aluminum became more smooth and compact with increasing of xAlCl3.When xAlCl3=0.667, chemical and physical properties of ionic liquids were best, Aluminum became more smooth and compact, when0.50<xAlCl3<0.697, reunion degree was lower with increasing of xAlCl3.We studied the influences of methylbenzene and Ammonium Chloride on BMIC-AlCl3ionic liquids and BMIC-AlCl3-TiCl4systems as the researched systems. Properties of each ionic liquids as electric conductivity, cyclic voltammetry curves. We found that the conductivity, cathodic current density of systems increased by adding methylbenzene to BMIC-AlCl3ionic liquids. While the conductivity and cathodic current density reduced by adding Ammonium Chloride. Cyclic voltammetry curves of BMIC-AlCl3-TiCl4demonstrated that titanium reduction process is a series of complex process. Firstly,Ti(Ⅳ) reducted to Ti(Ⅲ).Then Ti(Ⅲ) reducted to lower titanium ions. Finally titanium and aluminium were codeposited.Parameters such as temperature, potential, current density, xTiCl4, xC6H5CH3have positive or negative effect on morphology and current efficiency. The morphology and composition can be tested by SEM, EDS, XRD, XRF. When we choosed current density were4-6mA/cm, XTiCl4was0.0124, potential were1.9-2.1V, temperature were343-353K,Current efficiency, titanium relative content, coating morphology could achieved in the best situation. When xC6H5CH3were0.0543～0.0810, Methylbenzene made Ti-Al alloys smooth and compact. Moreover, the grain became spherical and reunion degree became low. Ammonium Chloride made particle non-uniformity and gap increased, reunion degree increased.