Microstructure and Corrosion Properties of Electrodeposited CoCrFeMnNi High Entropy Alloy Coatings

This study investigated the effect of potential change on microstructure and corrosion properties CoCrFeMnNi HEA coatings synthesized by electrochemical deposition method. The films were precipitated in an electrolyte based a DMF-CH 3 CN organic system comprising Co, Cr, Fe, Mn, Ni cations. GIXRD pattern all samples showed single face-centered-cubic structure. SEM-EDS results show that coating morphology elements value alloy composition vary at different potentials. Coatings uniform crack-free surfaces. wettability test super-hydrophilic. All alloys exhibited similar passivation negative hysteresis processes CPP test. However, 5 V sample lower E pit than 6 V, none sensitive to pitting corrosion. result current density was 0.0525 μA/cm 2 , minimum rate for coated samples, has improved resistance substrate about 44 times. EIS excellent performance enhancing compared Cu 3.5 wt% NaCl solution, as protection efficiency 90%. These High entropy are suitable engineering applications which higher is needed.