Electrodepostion of nickel fly ash (Ni-FA) composite coating on aluminium alloy 7075 substrate from non-aqueous media : study effect of current density

Yahaya, Muhamad Amerul Mukmin (2017) Electrodepostion of nickel fly ash (Ni-FA) composite coating on aluminium alloy 7075 substrate from non-aqueous media : study effect of current density. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

	Text (24 Pages) Electrodepostion Of Nickel Fly Ash (Ni-FA) Composite Coating On Aluminium Alloy 7075 Substrate From Non-Aqueous Media ; Study Effect Of Current Density.pdf - Submitted Version Download (439kB)
	Text (Full Text) Electrodepostion of nickel fly ash (Ni-FA) composite coating on aluminium alloy 7075 substrate from non-aqueous media study effect of current density.pdf - Submitted Version Restricted to Repository staff only Download (14MB)

Abstract

The nickel coating with fly ash as reinforcement are electrodeposited on aluminum alloy 7075 (AA7075) with non -aqueous bath via various current density. The aim of this research is to identify the hardness behaviour and corrosion resistance of nickel fly ash composite coating on AA7075 substrate. The electrodeposition process in the glass cell was using an ethylene glycol bath as a solution at temperature 40ºC along 1 hour’s electrodeposition period. Various current density have been used which are 0.10A/dm2, 0.15A/dm2, 0.20A/dm2. Annealing process is use to study the effect of annealing temperature to the nickel fly ash composite coating. The temperature that use for annealing process is 200ºC and 400ºC. The Surface morphology of the composite coating is analyzed by using scanning electron microscope (SEM) and concentration of fly ash composition is analyzed by using X-Ray florescence (XRF). The phase present of fly ash together in the nickel matrix in the composite coating on AA7075 substrate is study by using X-Ray diffraction (XRD). Surface morphology and structure of nickel composite coatings become more compact and denser as well as increasing current density. The hardness behaviour and corrosion resistance of coating improved with the increasing of the current density. The hardness behaviour of coating increase after 200ºC annealing temperature and decrease at 400ºC annealing temperature. The corrosion resistance of coating becomes less noble after annealing process. To study the relationship between various current density and annealing temperature toward the nickel grain size, the size of nickel grain is measure and comparing with the crystal size of other different current density and annealing temperature.

Actions (login required)

View Item