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research-article

Tribological Properties of Electrodeposited Ni-Co3O4 Nanocomposite Coating on Steel Substrate

[+] Author and Article Information
Khalida Akhtar

National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar-25120, Khyber Pakhtunkhwa, Pakistan
khalida_akhtar@yahoo.com

Hina Khalid

National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar-25120, Khyber Pakhtunkhwa, Pakistan
hinakhd@yahoo.com

Ikram Ul Haq

National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar-25120, Khyber Pakhtunkhwa, Pakistan
kako_khan2000@yahoo.com

Naila Zubair

National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar-25120, Khyber Pakhtunkhwa, Pakistan
nailazubair20@yahoo.com

Zia Ullah Khan

National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar-25120, Khyber Pakhtunkhwa, Pakistan
xiaswat@hotmail.com

Abid Hussain

National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar-25120, Khyber Pakhtunkhwa, Pakistan
abidturi@hotmail.com

1Corresponding author.

ASME doi:10.1115/1.4036450 History: Received September 29, 2016; Revised March 24, 2017

Abstract

Uniform nanoparticles of cobalt oxide precursors were prepared by the chemical precipitation in which the headspace vapors of ammonium hydroxide solution of known concentration was allowed to bubble through the aqueous solutions of cobalt sulfate, containing appropriate amount of the nonionic surfactant, octylphenoxy poly ethoxy ethanol. SEM images showed that uniformity in particle size was dependent upon the applied precipitation conditions. Extensive optimization was therefore performed for the attainment of uniformity in particle size and shape. The amorphous precursor was transformed into crystalline Co3O4 as confirmed by X-ray diffractometry. These particles, with isoelectric point at pH~ 8.4, were then employed as reinforcement additive for strengthening the electrodeposited nickel matrix. Effect of various parameters, i.e. stirring rate, applied current density, and temperature was studied on the amount of the codeposited Co3O4 particles in the nanocomposite coatings (Ni-Co3O4) during the electrodeposition process. pH of the coating mixtures was kept below IEP value of Co3O4 so that the latter particles carried net positive surface charge. The coated surfaces were subjected to various tests, i.e. microhardness, wear / friction, and corrosion. Results revealed that irrespective of the amount of the embedded Co3O4 particles, nanocomposite coatings demonstrated superior performance as compared to pure nickel coatings.

Copyright (c) 2017 by ASME
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