Abstract
The cobalt electrodeposition mechanism has been studied through potentiodynamic polarisation curves using cobalto as working electrode (cathode) and an electrolyte of 1.0 M Co2+. It has been observed that the oxygen and pH variation have a markedly influence over the cobalt deposition. Taking this observation into account, polarization curves have been got from electrolyte with reduced oxygen levels (by bubbling nitrogen gas) and with addition of boric acid (buffering substance). Electrochemical parameters such as exchange current density, anodic and cathodic Tafel constants, limiting current density, and equilibrium potential were got and compared to theoretical values with a good correlation. For the study of hydrogen evolution reaction on cobalt (H+ reduction process), it was used an electrolyte of 2.0 M NaCl and it was got a good correlation, too.
Reference
PANOSSIAN, Z.; OHBA. M; COSTA, D. A study on cobalt electrodeposition mechanism. In: INTERNATIONAL CORROSION CONGRESS, 15., 2002, Granada. Proceedings… Granada, Espanha: ICC International Corrosion Council, 2002. (CD-ROM)
The cobalt electrodeposition mechanism has been studied through potentiodynamic polarisation curves using cobalto as working electrode (cathode) and an electrolyte of 1.0 M Co2+. It has been observed that the oxygen and pH variation have a markedly influence over the cobalt deposition. Taking this observation into account, polarization curves have been got from electrolyte with reduced oxygen levels (by bubbling nitrogen gas) and with addition of boric acid (buffering substance). Electrochemical parameters such as exchange current density, anodic and cathodic Tafel constants, limiting current density, and equilibrium potential were got and compared to theoretical values with a good correlation. For the study of hydrogen evolution reaction on cobalt (H+ reduction process), it was used an electrolyte of 2.0 M NaCl and it was got a good correlation, too.
Reference
PANOSSIAN, Z.; OHBA. M; COSTA, D. A study on cobalt electrodeposition mechanism. In: INTERNATIONAL CORROSION CONGRESS, 15., 2002, Granada. Proceedings… Granada, Espanha: ICC International Corrosion Council, 2002. (CD-ROM)
