Electrodeposition of binary nickel-chromium (Ni-Cr) alloy on aluminium 1000 series substrate in organic solvent

Sii, Hee Hing (2018) Electrodeposition of binary nickel-chromium (Ni-Cr) alloy on aluminium 1000 series substrate in organic solvent. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The investigation regarding the use of organic Solvents solution in Nickel Chromium has been studied comprehensively. However, to produce a binary alloy with the ethylene glycol has not yet fully explored. The main purpose of this study is to produce coating of binary nickel alloy of Ni-Cr on the aluminium 1000 series substrate using the electrodeposition method in the organic solvent solution. The aluminium 1000 series was used as the substrate and the substrate is polished until the mirror-like surface. The substrate is then degreased, rinsed and mounted using the ethanol, distilled water and epoxy resin respectively. Finally, the sample is electrodeposited using the different current density of 125, 250 and 500 mA/dm2. The plating bath with nickel chloride and chromium chloride which are mixed homogenously with the ethylene glycol solution. Scanning electron microscope, X-ray Fluorescence and X-ray diffraction were used to determine the surface morphology and the elemental composition respectively. Moreover, the electrochemical measurements were done in the 3.5 wt.% of sodium chloride to study the corrosion behaviour of the coated alloy. Additionally, the best parameter of plating Ni-Cr is 250 mA/dm2 and with the 0.01M concentration of Cr (III) ions. This is because with this parameter, the highest mechanical properties (70HV) and (0.33μm) of the coated alloy are done using the hardness test, and the surface roughness test by the micro Vickers hardness test and profilometer respectively.

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