Abstract <p>In order to increase the service life of ductile iron (DI) components, various coating methods are used to improve surface properties such as hardness, wear resistance, and corrosion resistance. In recent years, the electrospark deposition (ESD) method has become a preferred surface coating process. This is due to its numerous advantages, including simple equipment and ease of use, strong metallurgical bonding, environmental friendliness, and cost-effectiveness. In this study, a high-entropy alloy was produced on unalloyed ductile iron using the ESD method at different voltages. The microstructures of the high-entropy alloy-coated ductile iron were examined, and properties such as micro hardness, layer thickness, and corrosion resistance were evaluated. To characterize the microstructure and composition of the coatings, optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) analyses were performed. The results showed that the corrosion resistance of the Ductile iron coated with the high-entropy alloy increased. The best corrosion resistance and homogeneous coatings were obtained at upper voltages.</p>