CORROSION AND WEAR PROPERTIES OF ELECTRODEPOSITED TERTIARY NANOCOMPOSITE Zn–Ni (ALUMINA–YITTRIA–GERAPHENE) COATING

Hamed Rahmani (), Mahmood Aliofkhazraei and Abdossalam Karimzadeh ()
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Hamed Rahmani: Department of Science and Material Engineering, Khajeh Nasir Toosi University, Tehran, Iran
Mahmood Aliofkhazraei: Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran
Abdossalam Karimzadeh: Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran

Surface Review and Letters (SRL), 2017, vol. 24, issue 05, 1-10

Abstract: Nanocomposite Ni–Zn coatings containing 80 wt.% Al2O3, 5 wt.% Y2O3 and 15 wt.% graphene were fabricated by pulsed electrodeposition method in nickel–zinc sulphate-based electrolyte and effects of pulse current parameters on nickel and other element contents, microstructure, resistance to corrosion and tribological properties of the coatings were investigated. The pulsed current with duty cycle from 10% to 50% was applied to different samples and frequency changed gradually from 500 to 4000Hz in five steps during coating process. Increasing the duty cycle led to decrease of absorbed nanoparticles in the surface of the coatings from 4.4 vol% to 3.58 vol% The sample coated with 10% duty cycle had utmost alumina content in the coating surface, 3.5 vol% in first layer up to 4.4 vol% in fifth layer. The sample coated with 30% duty cycle had higher corrosion resistance with passive current density of 2.5mA/cm2. Furthermore, the results showed that by increasing the duty cycle, wear rate had been increased up to 1.3×10−6mm2/N⋅m.

Keywords: Zn–Ni; pulsed electrodeposition; nanocomposite coating; gradient multilayer coating; corrosion; wear (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500664

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