Effect of fly ash particle size and composition on the properties of electrodeposited nickel fly ash (Ni-FA) composite coating on aluminium alloy 7075 substrate

Md Azmi, Noramira (2017) Effect of fly ash particle size and composition on the properties of electrodeposited nickel fly ash (Ni-FA) composite coating on aluminium alloy 7075 substrate. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Fly ash (FA) with three different particle sizes and five compositions were prepared and co-deposit into aluminium substrate by using an electrodeposition process. The effects of fly ash particle size and its composition on the hardness, wear and corrosion of electrodeposited Nickel-Fly Ash (Ni-FA) composite coating on AA7075 substrate were investigated. Various FA particle size was prepared by using ball milling with various milling time (0h (as received), 4h and 8h). Then, the FA is weighed to five compositions (0g/l (pure nickel), 10g/l, 30g/l, 50g/l, and 70g/l) in order to find the optimum composition of FA. With the increasing ratio of fine particles and composition, the hardness of the substrate increased, while the corrosion rate decreased considerably. There are some potential benefits that can be gained by the aircraft company after completion of this study. The addition of second phase particle onto composite coating will reduce the density of the aluminum used, increase the hardness, as well reduce corrosion rate.

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