Investigation of pulse electrodeposited Ni–Co/SiO₂ nanocomposite coating

Abstract

Ni–Co/SiO₂ nanocomposite coating was deposited on the steel substrate by pulse electrodeposition method. The coatings were characterised by X-ray diffraction, field emission scanning electron microscopy technique, energy-dispersive X-ray spectroscopy and X-ray map (dispersive elemental mapping) analysis. The influences of stirring rate, pH and SiO₂ concentration parameters on the mechanical properties and corrosion resistance were studied. The zeta potential of SiO₂ nanoparticles was decreased by mounting the pH and also adsorption of the surfactant SDS. Microhardness, friction coefficient, wear and anodic polarisation were determined through Buhler microhardness tester, pin-on-disc wear test and potentiostat galvanic device, respectively. By applying optimum electrodeposition condition (stirring rate 200 rev min⁻¹, pH 4.6 and SiO₂ concentration 20 gL⁻¹) incorporation of SiO₂ particles into the nickel–cobalt matrix increases which results in the preparation of coatings with high microhardness and corrosion resistance, low friction coefficient and wear mass loss.

Keywords:

• Nanocomposite coating
• pulse electrodeposition
• stirring rate
• pH
• nanoparticles concentration

ORCID

Siavash Imanian Ghazanlou http://orcid.org/0000-0002-9237-8902

Somayeh Ahmadiyeh http://orcid.org/0000-0002-2213-1293

Rezvan Yavari http://orcid.org/0000-0001-6680-6654

Disclosure statement

No potential conflict of interest was reported by the authors.