Original scientific paper

Effect of ultrasonic power on corrosion resistance and hardness of Ni-Co- Al₂O₃ nanocomposite coatings

H. Jin ; School of Materials Science and Engineering, Shenyang University of Technology, China; School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, China
L. J. Chen ; School of Materials Science and Engineering, Shenyang University of Technology, China
X. Y. Zhou ; School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, China
Y. Y. Wang ; School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan, China

Abstract

The Ni - Co - Al₂O₃ composite coatings were prepared by electroplating under ultrasound condition. The influence of ultrasonic power on micro hardness and corrosion resistance was investigated. Studied by Scanning Electron Microscope (SEM), Energy Disperse Spectroscopy (EDS) and X - Ray Diffraction (XRD), under the cavitation effect of ultrasound condition, the nano Al₂O₃ was dispersed in the coating, and the composite coatings had refiner grains. The surface morphology of coating was uniform and compact. With the increasing of ultrasonic power, the micro hardness of Ni - Co - Al₂O₃ composite coatings increased first and then decreased. When ultrasonic power was 240W, the composite coatings has the highest hardness and the best the corrosion resistance.

Keywords

Ni - Co - Al₂O₃ composite coating; ultrasonic electroplating; SEM/EDS/XRD; corrosion resistance; hardness

Hrčak ID:

201736

URI

https://hrcak.srce.hr/201736

Publication date:

1.10.2018.

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