Microstructure, corrosion resistance, and antibacterial property of HVAF-sprayed Cu55Ti25Zr15Ni5 coating

The aim of this paper is to develop a protective coating with both corrosion resistance and microbially-influenced corrosion resistance. We reported a Cu55Ti25Zr15Ni5 amorphous powder, which was deposited into a coating by high velocity air-fuel spray. The coating was characterized via X-ray diffractometer, field-emission scanning electron microscope, and transmission electron microscope. For the electrochemical behavior, potentiodynamic polarization and electrochemical impedance spectroscopy were employed. Antibacterial property was assessed in terms of the inhibitory effect on Pseudomonas aeruginosa. The study findings revealed a crystallization temperature of 465. for the powder. The coating was dense with a lamellar structure, consisting of amorphous phase, Cu0.81Ni0.19 and tetragonal-ZrO2. In seawater, the coating showed a polarization resistance of 8581 O center dot cm(-2), with corrosion dominated by Warburg diffusion. The coating formed a natural Cu2O-ZrO2-TiO2 film, while the corrosion products consisting of CuO, ZrO2, and TiO2. Notably, the coating displayed a bactericidal rate of (83.1 +/- 4.5)% within 24 h. This work provided valuable insights into the preparation of Cu-based amorphous coating, while demonstrating its potential to resist microbially-influenced corrosion.