(北京科技大學(xué) 鋼鐵冶金新技術(shù)國家重點實驗室，北京 100083)
摘 要: 以TA3鈦板為陽極，純鎳板為陰極，在550 ℃的 LiCl-NaCl-KCl-TiClx體系中，研究鈦離子陰極電化學(xué)行為；同時研究脈沖電解參數(shù)對陰極沉積過程的影響。結(jié)果表明：陰極上Ti3+的電化學(xué)行為是經(jīng)放電變成Ti2+再進一步被還原成Ti的過程；與恒電流電解相比，脈沖電解更易得到致密沉積產(chǎn)物，且產(chǎn)物結(jié)晶度更高、氧氮含量更低；脈沖電解參數(shù)對陰極產(chǎn)物沉積形貌有重要影響，電解周期(tc)為10 min時，通斷比(n)過大或過小均不利于陰極產(chǎn)物長大，且陰極電流效率低。最佳脈沖電解條件為陰極電流密度0.3 A/cm2、通電周期20 min、通斷比(n)1，此時獲得的陰極產(chǎn)物結(jié)晶度高，顆粒尺寸大且產(chǎn)物致密，電流效率達87.4%。
關(guān)鍵字: 鈦；脈沖電沉積；熔鹽電解；陰極電流效率
（State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:The pulsed electrodepositon behaviors of titanium on nickel cathode were investigated in LiCl-NaCl-KCl-TiClx molten salt at 550 ℃ by a molten electrolysis method using TA3 titanium plate as anode. And the effects of pulsed electrodeposition parameters on cathode products were also investigated. The results show that the electrochemical behavior of Ti3+ → Ti at cathode is a two-step diffusion-controlled process with intermediate Ti2+ and Ti+. Comparing with galvanostatic electrodeposition, the products obtained by pulsed electrodeposition have higher compactness, higher crystallinity, and lower oxygen and nitrogen contents. The parameters of pulsed electrodeposition have important influences on the deposited products. When the electrolysis cycle time is short (tc=10 min) and the ratio of current on/off (n) is higher or lower, the size of the products is smaller and the current efficiency is lower. The compact titanium products with large grains and current efficiency of 87.4% are obtained at cathodic current density of 0.3 A/cm2 when tc=20 min and n=1.
Key words: titanium; pulsed electrodeposition; molten electrolysis; cathode current efficiency
