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钛镀层的质量主要取决于其形貌和致密度。采用恒电流电镀得到的钛镀层极易产生枝晶,因而质量较差。本文采用循环伏安法和换向计时电位法,在含5.4%(质量分数)Ti2+的NaCl–KCl–TiCl2熔盐中研究了Ti2+的阴极电化学行为。结果表明,钛的阴极还原是一个一步反应,且主要受扩散控制。为避免枝晶,在上述熔盐体系中,以不锈钢为阴极,采用脉冲电流法进行镀钛。当周期为10s,通断比为5∶5时,在电流密度为0.3A/cm2的条件下,可以制备出颗粒尺寸大且致密的钛镀层,其电流效率接近90%。
The quality of the titanium coating depends mainly on its morphology and density. The use of galvanostatic galvanized titanium coating is very easy to produce dendrites, so the quality is poor. In this paper, cyclic voltammetry and reversing chronopotentiometry were used to study the cathode electrochemical behavior of Ti2 + in molten salt of NaCl-KCl-TiCl2 with 5.4% (mass fraction) Ti2 +. The results show that the cathodic reduction of titanium is a one-step reaction and is dominated by diffusion. In order to avoid dendrite, in the above molten salt system, stainless steel as the cathode, the use of pulse current method for titanium. When the cycle time is 10s and the on-off ratio is 5: 5, the current density of 0.3A / cm2 can produce titanium particles with large particle size and compact density, and the current efficiency is close to 90%.