Materiales

 

Cobalt-indium alloys electrodeposition from citrate electrolyte and spatio-temporal patterns formation

 

Electrodepósito de aleaciones cobalto-indio a partir de electrolitos de citrato y formación de patrones espacio-temporales

 

L. Veleva¹, M.A. Estrella-Gutiérrez²*, Ts. Dobrovolska² and I. Krastev²

 

¹ Department of Applied Physics, Center for Investigation and Advanced Studies (CINVESTAV-IPN), Mérida, México.

² Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria. *Corresponding author. E-mail: mestrella@mda.cinvestav.mx

 

Received July 26, 2012
Accepted March 10, 2013

 

Abstract

Cyclic voltammetry technique was used to compare the mechanism of the deposition of In, Co and Co-In from citrate electrolytes. Samples of Co-In coatings were electrodeposited at different current densities to permit the subsequent investigation of their physicochemical characteristics. It was established a strong relation between Co-In phase composition and the electrolysis conditions. At low current densities below the limiting current only In was deposited. At higher current the alloy phase of CoIn₃ was formed, besides that of In, and minority phases were Co and Co(OH)₂. At higher current densities of about 0.8-1.5 A/dm², when intemive hydrogen evolution was observed, specific pattern (spirals, -waves, targets) were visible onto trie Co-In coating surfaces, considered as spatio-temporal structures. The pattern formation could be promoted by the specific hydrodynamic conditions close to the cathode-electrolyte interface and by the concentration fluctuation of the ionic species.

Keywords: electrodeposition, cobalt-indmm alloy, cyclic voltammetry, spatio-temporal patterns, XRD, SEM-EDX.

 

Resumen

La técnica de voltametría cíclica fue utilizada para comparar el mecanismo de deposición de In, Co y Co-In a partir de electrolitos de citrato. Muestras de los recubrimientos de Co-In fueron electrodepositados a diferentes densidades de corriente para poder realizar una investigación posterior de sus características fisicoquímicas. Se estableció que hay una fuerte relación entre la composición de las fases Co-In y las condiciones de la electrólisis. A densidades de corriente por debajo de la corriente límite, solo fue depositado In. A densidades de corriente mayores se formó la fase CoIn₃, al igual que In, y como fases minoritarias fueron Co y Co(OH)₂. A mayores densidades de corriente entre 0.8-1.5 A/dm², cuando se da un a intensiva evolución de hidrógeno, patrones específicos visibles (ondas, espirales y targets) fueron observados sobre la superficie de los depósitos de Co-In, que son considerados como estructuras espacio-temporales. La formación de estos patrones podría ser promovida por las condiciones hidrodinámicas específicas cerca de la interfase del cátodo-electrolito y por la fluctuación de la concentración de las especies tónicas.

Palabras clave: electrodeposición, aleaciones cobalto-indio, voltametría cíclica, patrones espacio-temporales, XRD, SEM-EDX.

 

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