Ultrasonic-assisted Ni–Mo–P doping hydrothermal synthesis of clustered spherical MoS₂ composite coating: wear and corrosion resistance

ABSTRACT

In this study, MoS₂ particle and ultrasonic field (UF) were successfully employed to produce Ni–Mo–P, Ni–Mo–P/MoS₂ and UF–Ni–Mo–P/MoS₂ electroless composite coatings on Q235 mild steel. The surface microscopic, microstructures and roughness of the coating were studied using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), atomic force microscope (AFM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The corrosion resistance was analysed by Tafel plots and by electrochemical impedance spectroscopy (EIS). The results indicated that compared to a pure Ni–Mo–P coating, the UF–Ni–Mo–P/MoS₂ composite coating exhibited better corrosion resistance. The friction tests showed that MoS₂ particle enhanced the wear resistance of the composite coating. The potential mechanism was that ultrasonic field suppressed the hydrogen gas occlusion and brought about a uniform and dense surface.

KEYWORDS:

• Ultrasonic field
• corrosion resistance
• composite coating
• wear

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported from the National Natural Science Foundation of China (Project Number 21606151, 21504057, and 21707092), Shanghai Excellent Technology Leaders Program (Project Number 17XD1424900), Science and Technology Commission of Shanghai Municipality Project (Project Number 18090503800).