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Heat-treatment response of electrodeposited MnCrCoFeNiCu HEA-CNT coatings: Microstructure, phase transformation, and corrosion behaviour
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DOI：10.1016/j.surfin.2026.109344.png)
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Abstract
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MnCrCoFeNiCu HEA - CNT coatings were electrodeposited on mild steel substrates. Heat treatment was then applied to the resultant coatings at a range of temperatures, from 100 degrees C to 700 degrees C. Microstructure, phase composition, electrochemical characteristics, hardness, and corrosion rate by immersion tests were examined. With increasing annealing temperature, SEM results showed progressive densification and grain refinement with maximum surface compactness. Coating homogeneity, temperature stability, and resistance to heat deterioration were all significantly enhanced by the synergistic effect of heat treatment and CNT addition. XRD results confirmed the improved crystallinity and phase transformation. Potentiodynamic polarization (Tafel) tests revealed that coatings have the strongest positive corrosion potential and the lowest corrosion current density, indicating greater corrosion resistance with increasing temperature in 3.5 wt. % NaCl solution. These results were further supported by electrochemical impedance spectroscopy (EIS), corrosion rate trend by immersion testing and microhardness. Overall, the corrosion resistance of HEA - CNT coatings was enhanced by the combination of CNTs and heat treatment, making them viable options for application in harsh environments.
Keywords:
High entropy alloy coatings
Annealing
Morphology
Phase composition
Corrosion resistance
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