Cu-Co alloys were electrodeposited on steel substrates from alkaline sodium tartrate electrolyte using direct and single pulsed current (DC and SPC, respectively). The electrodeposition bath was composed by 0.02 mol L −1 of CuSO 4 .5H 2 O, 0.10 mol L −1 of CoSO 4 .7H 2 O and 0.50 mol L −1 of Na 2 C 4 H 4 O 6 .4H 2 O. Using both kind of deposition processes, it was verified that the applied current density (j) affected the cathodic current efficiency (E f ), the copper and cobalt contents in the coatings (wt. % Cu and wt. % Co, respectively), the morphology and the anticorrosive performance of the coatings (based on the transfer charge resistance, (R ct ) values). Comparing the results obtained for DC and SPC coatings, those produced by single pulsed current improved the E f values and decreased the grain sizes. Concerning the conditions used in this work, the coating produced under the conditions of Experiment 4', using j m = 40 A m -2 and SPC mode, presented 15.9 wt. % Co, the most compact morphology, the smallest grain size and the highest R ct value after 24 h of exposure in the saline medium.

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The process is investigated in the presence of Cu2O and CuO nanoparticles and CuO microparticles.