Pulse electrodeposition of Zn-Co alloy coatings obtained from an alkaline bath

► Effect of pulse current parameters on surface morphology and phase distribution. ► The optimum cobalt content of the Zn-Co electrodeposits. ► Cobalt acts as a grain refiner in the Zn-Co electrodeposits. ► Zn-Co (2.35 wt.% Co) showed the highest corrosion resistance among the coatings. ► Influence of phase structure and grain size on corrosion behavior.