Abstract
In this work, Ni-Cu nano-alloying coatings were synthesized by pulsed electrodeposition technique from electrolyte with 0, 2.5, 5 and 7.5 g/L cupric sulfate. The effect of cupric sulfate on the microstructure, micro-morphology, and corrosion behavior of samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). A Varying amount of Cu was found to co-deposit in the coatings. The adequate amount of Cu can markedly enhanced the corrosion resistance of the coating due to the enhanced resistance to reactions at the metal|passive film (m|f) interface and reduction of oxygen vacancies by the dopant of Cu+ in the passive film.
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