The present study consistsan experimentation of Zinc-Cobalt composite coatings. For this, the Chromium concentration influence was the principal object to improve the corrosionresistance of the coatings, which has been made by electroplating on steel substrates previously treated; it hasbeen studied by several characterization methodssuch as the X-ray diffraction, micro-hardness measurement and scanning electron microscopy (SEM). The protection against corrosion properties has been studied by potentiodynamic polarization measurements (Tafel) and electrochemical impedance spectroscopy (EIS) to the potential of corrosion-free. The parameters characterizingthe corrosion behaviour,can be determined from the Nyquist plots. It has been observed that the ternary Zn-Co-Cr alloy is characterized by enhanced the corrosionresistance compared to the binary Zn–Co alloys. Also, the addition of Cr in the Zn-Co increases the micro-hardness, XRD and SEM results and identifies any coatings Zn-Co-Cr alloy composition reveals that zinc phase.

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