Abstract: The Cu -doped fluorohydroxyapatite (Cu-FHAp) coating's combination of beneficial properties, including biocompatibility, corrosion resistance, and antibacterial effects, makes it a promising choice for coating magnesium alloys, particularly for biomedical implant applications. Electrodeposition under ultrasonic agitation is a method used for the synthesis of Cu-FHAp coatings, where the ultrasonic power is an important parameter that can affect the coating quality and performance. This study aimed to investigate the effect of ultrasonic power (0, 10, and 50 Wats) on various properties of the Cu-FHAp pcoating electrodeposited onto AZ31 alloy. Microstructural analysis confirmed the successful formation of Cu-doped FHAp bioceramic on the substrate using this method. The results indicated that the use of ultrasonication produced a more uniform coating structure, reducing surface roughness up to 39% and improving hydrophilicity up to 65%. Moreover, increasing the ultrasonic power from 10 to 50 watts led to a reduction in coating thickness and also enhanced corrosion resistance due to the higher density of the Cu-doped FHAp coating. Biological assessments demonstrated favorable cell adhesion to the coated alloy, indicating the potential of the synthesized Cu-doped FHAp coatings for biomedical applications.
