Effects of pulse current electrodeposition parameters on the properties of nickel-quarry dust composite coatings

Muhammad Nadzri, Nur Afiqah Nasuha (2024) Effects of pulse current electrodeposition parameters on the properties of nickel-quarry dust composite coatings. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this study is to examine where different current densities and duty cycles affect the hardness, wear resistance, and surface morphology of composite coatings produced from Ni-Quarry Dust. Composite coatings produced from Ni-Quarry Dust were created by applying the pulse current electrodeposition method where nickel acts as anode and substrate which is mild steel is acts as cathode. The pulse current electrodeposition technique is done by immersing the anode and cathode into the plating bath for one hour. Various current density and various duty cycles which are 1 A/dm2, 3 A/dm2, 5 A/dm2, 7 A/dm2 and 9 A/dm2 and 25%, 50% and 75% are used respectively. Obtained results indicated that Ni-Quarry Dust composite coatings prepared by pulse current electrodeposition display improved hardness and wear resistance properties. SEM micrograph shows that surface morphology obtained at 25% duty cycle shows uniform and finer electrodeposited and surface morphology obtained at 9 A/dm2 shows large grain sizes with agglomerated. The microhardness of the composite coatings was measured by microVickers test. The results show that at 75% duty cycle and 9 A/dm2 condition shows the highest hardness. In addition, the wear resistance was characterized by pin on disc machine. The result shows that uniform and finer surface morphology has result in lower COF. The composite coating with the maximum value wear resistance is therefore the one done at 25% duty cycle. Overall, the Ni-Quarry Dust composite coating prepared by pulse current electrodeposition improves the composite coating's tribological and mechanical properties for automotive application such as bearings, shafts and gears.

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