Effect of ultrasound on Ni-Co/ZrO₂ composite electrodeposition and corrosion resistance study of coatings

Abstract

In order to study the effect of ultrasonic waves on Ni-Co/ZrO2 composite coatings in the codeposition process, Linear sweep voltammetry and Tafel test techniques were used to offer favorable reference.Using Scanning electron microscope and X-ray diffraction to analysis the effect of ultrasonic power on surface morphology and microstructure of Ni-Co/ZrO2 composite coating. The results indicated that the ultrasonic waves caused the reduction potential of Ni-Co/ZrO2 composite coatings to shift to more positive potentials and decreased cathodic polarization, and ultrasonic power directly affected the grain size of composite coating, thus influenced the microstructure and properties of the coatings. The composite coating prepared under ultrasonic power of 240 W had compact and uniform surface morphology with good corrosion resistance.

Keywords

• composite coatings
• ultrasonic
• cathodic polarization
• corrosion resistance