Ultrasonic-assisted deposition of Ni-P-Al2O3 coating for practical protection of mild steel: Influence of ultrasound frequency on the corrosion behavior of the coating

Document Type : Research Article

Authors

1 Depth. Of physical chemistry, Faculty Of chemistry, University Of Tabriz, Tabriz, Iran

2 Department of Physical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran

Abstract

In this paper, the precipitation of nickel-phosphorous (Ni-P) electroless coatings including Al2O3 nanoparticles (Ni-P-NA) using ultrasound waves on mild steel has been studied. Deposition process occurred in a lactic plating bath by the autocatalytic method using an ultrasound probe. The effect of radiation frequency on the properties of coatings was investigated, and the optimum frequency was determined. The obtained samples were evaluated for their corrosion resistance, surface morphology, and hardness by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and scanning electron microscopy (SEM). The results showed that ultrasound waves caused an improvement in the corrosion resistance and uniformity of the coatings. Furthermore, five different wave frequencies applied during deposition disclosed the remarkable impact of frequency on the smoothness and corrosion resistance of the resultant coatings. On this basis, the Nyquist diagrams showed that the corrosion resistance of the prepared Ni-P-NA coating at an optimum frequency of 75 kHz was 2.59 kΩ·cm2. This value was about 2.5 times higher than the value obtained for the Ni-P-NA coating deposited without ultrasound power.

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References

 
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Chemical Review and Letters
Volume 5, Issue 2 - Serial Number 2
March 2022
Pages 127-132

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History

  • Receive Date: 10 April 2022
  • Revise Date: 07 May 2022
  • Accept Date: 08 May 2022

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