Corrosion Resistance of Ni/Al2O3 Nanocomposite Coatings

Beata KUCHARSKA; Agnieszka BROJANOWSKA; Karol POPŁAWSKI; Jerzy Robert SOBIECKI

doi:10.5755/j01.ms.22.1.7407

Authors

Beata KUCHARSKA The Faculty of Materials Science and Engineering, Warsaw University of Technology
Agnieszka BROJANOWSKA
Karol POPŁAWSKI
Jerzy Robert SOBIECKI

DOI:

https://doi.org/10.5755/j01.ms.22.1.7407

Keywords:

nickel coating, Al2O3 particles, electrodeposition, corrosion resistance, nanocomposite

Abstract

Nickel matrix composite coatings with ceramic disperse phase have been widely investigated due to their enhanced properties, such as higher hardness and wear resistance in comparison to the pure nickel. The main aim of this research was to characterize the structure and corrosion properties of electrochemically produced Ni/Al₂O₃ nanocomposite coatings. The coatings were produced in a Watts bath modified by nickel grain growth inhibitor, cationic surfactant and the addition of alumina particles (low concentration 5 g/L). The process has been carried out with mechanical and ultrasonic agitation.

The Ni/Al₂O₃ nanocomposite coatings were characterized by SEM, XRD and TEM techniques. In order to evaluate corrosion resistance of produced coatings, the corrosion studies have been carried out by the potentiodynamic method in a 0.5 M NaCl solution. The corrosion current, corrosion potential and corrosion rate were determined. Investigations of the morphology, topography and corrosion damages of the produced surface layers were performed by scanning microscope techniques.

DOI: http://dx.doi.org/10.5755/j01.ms.22.1.7407