Optimization of Bath Temperature for Electrodeposited NiFeWMoMn High-Entropy Alloy Thin Films

In this study, NiFeWMoMn high-entropy alloy thin films were successfully synthesized using the electrodeposition method by varying the bath temperature. The structural, morphological, corrosion, magnetic, and compositional properties were systematically investigated using XRD, FESEM, EDS, electrochemical tests, and VSM. XRD analysis confirmed the formation of a solid solution with a refined crystalline structure, showing the smallest crystallite size and lower dislocation density at 75℃. FESEM images revealed uniform and dense surface morphology at this temperature, while EDS confirmed the presence of all intended elements with a more balanced atomic distribution. Electrochemical corrosion studies showed that the sample coated at 75℃ exhibited the lowest corrosion rate and the highest polarization resistance, indicating superior corrosion resistance. Magnetic measurements showed that coercivity increased with temperature. 75℃ was identified as the most favourable temperature for achieving a uniform coating, improved corrosion resistance, controlled magnetic behaviour, and enhanced structural properties.