Wear behavior and corrosion resistance of nickel coatings electrodeposited on aluminum alloy 7075 substrate via various current density

Md Zahir, Saiful Azhan (2015) Wear behavior and corrosion resistance of nickel coatings electrodeposited on aluminum alloy 7075 substrate via various current density. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The nickel coatings are electrodeposited on aluminum alloy 7075 (AA7075) via various current density. The aim of this research is to determine the wear behavior and corrosion resistance of nickel coating electrodeposited on AA7075 substrate. The electrodeposition process was using a nickel Watt’s bath as a solution at a temperature of 400C and pH value of 3.0. Various current density have been used which are 2.5, 5.0, and 7.5 mA/cm2. Amongs these three type of current density, 7.5 mA/cm2 give the best results of coatings. The morphology of the coating are analyzed using scanning electron microscopy (SEM) and the composition of coatings was identified using x-ray fluorescence (XRF). The morphologies and structures of nickel coatings become more compact and denser as well as increasing in current density. Increasing the current density also refining the grain size. The wear, and corrosion resistance of coating improved with the increasing in current density.

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