Effect Of Current Density And Heat Treatment On The Characteristic, Wear Resistance And Adhesion Of Nickel Nanocrystalline Coatings Deposited On Aluminum Alloy 7075 Substrate

Othman , Intan Sharhida and Ahmad, Muhamad Khaizaki and Zainal Abidin, Muhammad Zaimi and Mohamad Juoi, Jariah and Mohd.Rosli, Zulkifli and Mohamad, Noraiham and Mohd. Abid, Mohd. Asyadi Azam (2018) Effect Of Current Density And Heat Treatment On The Characteristic, Wear Resistance And Adhesion Of Nickel Nanocrystalline Coatings Deposited On Aluminum Alloy 7075 Substrate. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The nickel-fly ash (Ni-FA) composite coatings were deposited on zincated aluminium alloy 7075 (AA7075) substrate by using electrodeposition technique.The electrodeposition process was carried out for 1 hour at 40º C.The current density used was extended from 1,5 to 9 A/dm2.Fly ash particles was added to nickel citrate bath at 0,10,50 and 90 g/l for electrodeposition of Ni-FA composite coating.The produced composite coatings were characterized using X-ray Fluorescence (XRF) and X-ray Diffraction (XRD).Microhardness of Ni-FA composite coatings were also investigated in this study.As the current density increased from 5 to 9 A/dm2.the nickel grain size in the Ni-FA composite coating were decreased. The decreasing in nickel grain size resulted in increasing of hardness value.Besides,the hardness results show a clear increasing trend with an increase of fly ash composition from 10 to 90 g/l,due to the presence of hard oxide in the fly ash particles.

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