Microstructures and Properties of FeCoNiCr High-Entropy Alloy Coatings Prepared by Electrodeposition

FeCoNiCr high-entropy alloy coatings (HEAs) were prepared on copper substrate by the electrodeposition technique, employing various current densities. This study examines the microstructure, coating thickness, hardness, wear resistance, and corrosion properties of FeCoNiCr high-entropy alloy coatings fabricated under varying current densities. The high-entropy alloy coatings that were produced exhibit straightforward solid solution and face-centered cubic (FCC) phases. The scanning electron microscopy (SEM) analysis reveals that the FeCoNiCr high-entropy alloy coatings, fabricated under a current density of 25 A/dm2, exhibit a uniform and dense surface. Moreover, the occurrence of coating cracking is significantly reduced, and the structural integrity of the coating is improved. Additionally, the coatings exhibit maximum thickness and demonstrate a favourable bonding with the substrate. The experimental findings indicate a notable enhancement in the hardness and wear resistance of the coatings as the current density is increased. The electrochemical test results indicate that the FeCoNiCr high-entropy alloy coatings, which were fabricated using a current density of 25 A/dm2 in a 3.5 wt% NaCl solution to simulate seawater conditions, demonstrate improved resistance to corrosion. In general, the FeCoNiCr high entropy alloy coating prepared at 25A / dm2 has the best performance.