中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2013年
6期
1723-1731
,共9页
Cu%甲基紫%Cl-%电结晶%扩散系数
Cu%甲基紫%Cl-%電結晶%擴散繫數
Cu%갑기자%Cl-%전결정%확산계수
Cu?methyl violet%Cl-%electrocrystallization%diffusion coefficient
采用线性电势扫描、循环伏安和计时电流等电化学方法研究40℃下甲基紫和Cl?单独存在与同时存在时，含315 g/L CuSO4、110 g/L H2SO4的高浓度酸铜溶液中Cu在铜电极上的电结晶过程。结果表明：甲基紫和Cl?单独存在或同时存在时Cu的电结晶过程较为复杂，开始先按瞬时成核三维生长方式进行；随着时间的延长，逐渐向连续成核三维生长方式进行，但当成核时间较长时，其电结晶成核偏离理论模型，表现出扩散与电化学反应混合控制，而且甲基紫和Cl?共同作用时更快进入混合控制。甲基紫和Cl?在电沉积过程表现出显著的去极化作用，且它们的共同作用使Cu2+的扩散系数增大，明显促进铜的快速电结晶和成核过程。适宜的甲基紫和Cl?浓度，例如2.5 mg/L甲基紫和20 mg/L Cl?，会增大Cu2+的扩散系数，同时获得足够大的成核数密度，对铜电结晶有利。
採用線性電勢掃描、循環伏安和計時電流等電化學方法研究40℃下甲基紫和Cl?單獨存在與同時存在時，含315 g/L CuSO4、110 g/L H2SO4的高濃度痠銅溶液中Cu在銅電極上的電結晶過程。結果錶明：甲基紫和Cl?單獨存在或同時存在時Cu的電結晶過程較為複雜，開始先按瞬時成覈三維生長方式進行；隨著時間的延長，逐漸嚮連續成覈三維生長方式進行，但噹成覈時間較長時，其電結晶成覈偏離理論模型，錶現齣擴散與電化學反應混閤控製，而且甲基紫和Cl?共同作用時更快進入混閤控製。甲基紫和Cl?在電沉積過程錶現齣顯著的去極化作用，且它們的共同作用使Cu2+的擴散繫數增大，明顯促進銅的快速電結晶和成覈過程。適宜的甲基紫和Cl?濃度，例如2.5 mg/L甲基紫和20 mg/L Cl?，會增大Cu2+的擴散繫數，同時穫得足夠大的成覈數密度，對銅電結晶有利。
채용선성전세소묘、순배복안화계시전류등전화학방법연구40℃하갑기자화Cl?단독존재여동시존재시，함315 g/L CuSO4、110 g/L H2SO4적고농도산동용액중Cu재동전겁상적전결정과정。결과표명：갑기자화Cl?단독존재혹동시존재시Cu적전결정과정교위복잡，개시선안순시성핵삼유생장방식진행；수착시간적연장，축점향련속성핵삼유생장방식진행，단당성핵시간교장시，기전결정성핵편리이론모형，표현출확산여전화학반응혼합공제，이차갑기자화Cl?공동작용시경쾌진입혼합공제。갑기자화Cl?재전침적과정표현출현저적거겁화작용，차타문적공동작용사Cu2+적확산계수증대，명현촉진동적쾌속전결정화성핵과정。괄의적갑기자화Cl?농도，례여2.5 mg/L갑기자화20 mg/L Cl?，회증대Cu2+적확산계수，동시획득족구대적성핵수밀도，대동전결정유리。
The copper electrocrystallizations on copper electrode in the concentrated acid CuSO4 solutions, containing 315 g/L CuSO4 and 110 g/L H2SO4 with methyl violet and Cl?alone or both of them at 40 ℃ were studied by linear sweep voltammetry, cyclic voltammetry and chronoamperometry techniques. The results show that the electrocrystallizations in the electrolytes above are complex relatively. At beginning, the electrocrystallization processes follows the instantaneous nucleation with three-dimensional growth, and then changes to the progressive nucleation with three-dimensional growth gradually. But the processes would deviate from the theoretical model after longer nucleation time. The deviation suggests that the processes are controlled by both diffusion and electrochemical reaction step. Moreover, the combination of methyl violet and Cl? enable electrocrystallization to run into mixed control faster than methyl violet or Cl?. The methyl violet and Cl?have significant depolarization effect in the processes, and increase the diffusion coefficient of Cu2+in the electrolytes cooperatively and facilitate the electrocrystallization and nucleate process of copper notably. An optimum concentration of both methyl violet and Cl?, such as 2.5 mg/L methyl violet and 20 mg/L Cl?, can increase the diffusion coefficient and get enough nuclear number density on the electrode surface and is beneficial to electrocrystallization.
