Journal of the Chilean Chemical Society
versión On-line ISSN 0717-9707
RAMOS-LORA, NANCY; MENDOZA-HUIZAR, L.H y RIOS REYES, C.H. COBALT ELECTRODEPOSITION ONTO STAINLESS STEEL 304 FROM AMMONIACAL SOLUTIONS. J. Chil. Chem. Soc. [online]. 2011, vol.56, n.2, pp. 631-634. ISSN 0717-9707. http://dx.doi.org/10.4067/S0717-97072011000200001.
In this work we studied the cobalt electrodeposition onto a stainless steel 304 electrode from an aqueous solution containing 101 M of CoSO4 + 1M (NH4)2SO4 at natural pH of 4.5. Black cobalt deposits were obtained under our experimental conditions. The average diffusion coefficient calculated was 9.8X106 cm2s-1 while the AG for the formation of stable nucleus was 1.013X1020 J/nuclei. The critical cluster's size calculated was 0 which suggested that each active site is a critical nucleus on the SSE-304 surface. The Scanning Electron Microscopy images showed the formation of non-uniform cobalt particles.
Palabras clave : Black cobalt; SSE 304; electrodeposition; kinetic.