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In this work we studied the cobalt electrodeposition onto a stainless steel 304 electrode from an aqueous solution containing 10 -1 M of CoSO 4 + 1M (NH 4 ) 2 SO 4 at natural pH of 4.5. Black cobalt deposits were obtained under our experimental conditions. The average diffusion coefficient calculated was 9.8X10 -6 cm 2 s -1 while the ∆G for the formation of stable nucleus was 1.013X10 -20 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. Keywords: Black cobalt, SSE 304, electrodeposition, kinetic. e-mail: hhuizar@uaeh.edu.mx INTRODUCTION Often, a cobalt film is deposited onto a stainless steel electrode (SSE) to prevent its oxidation 1 . Several studies suggest that the cobalt films can be electrodeposited onto an SSE, if the deposition time and the cobalt concentration in solution can be controlled

COBALT ELECTRODEPOSITION ONTO STAINLESS STEEL 304 FROM AMMONIACAL SOLUTIONS