Response surface methodology optimization of pulse electrodeposited Ni- nano SiC coatings on Al 7075 substrate
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In this research work, Ni- nano SiC coating was pulse electrodeposited on Al 7075 substrate in a watt’s bath. A 3-level, 3-factorcentral composite design (CCD) of experiments were carried out to assess the influence of pulse plating parameters, i.e.,Current Density (A/cm2), Duty Cycle (%), Frequency (Hz) on the microhardness of Ni-SiC coating. A regression model isdeveloped to predict the microhardness of the developed coating using design expert software and optimal parameters forachieving maximum microhardness were found out. The morphology of the nano SiC coating was investigated using FESEMcoupled with EDAX, and X-ray diffractometer. Corrosion studies were carried out using Potentiometric polarization andElectrochemical Impedance tests, and the corrosion results show that corrosion potential for the aluminium alloy is -0.92 Vand for the Ni- nano SiC coating it increases to -0.65 V. Tafel and Nyquist plots reveal the improved corrosion characteristicsof the pulse plated Ni-SiC coating. Significant improvement in the microhardness of the coating is achieved with a maximumhardness of 329.6 HV. Results show that about 3 time’s enhancement in the microhardness obtained with the Ni-SiC nanocomposite coating, when compared to the Al7075 substrate.
Abstract
In this research work, Ni- nano SiC coating was pulse electrodeposited on Al 7075 substrate in a watt’s bath. A 3-level, 3-factorcentral composite design (CCD) of experiments were carried out to assess the influence of pulse plating parameters, i.e.,Current Density (A/cm2), Duty Cycle (%), Frequency (Hz) on the microhardness of Ni-SiC coating. A regression model isdeveloped to predict the microhardness of the developed coating using design expert software and optimal parameters forachieving maximum microhardness were found out. The morphology of the nano SiC coating was investigated using FESEMcoupled with EDAX, and X-ray diffractometer. Corrosion studies were carried out using Potentiometric polarization andElectrochemical Impedance tests, and the corrosion results show that corrosion potential for the aluminium alloy is -0.92 Vand for the Ni- nano SiC coating it increases to -0.65 V. Tafel and Nyquist plots reveal the improved corrosion characteristicsof the pulse plated Ni-SiC coating. Significant improvement in the microhardness of the coating is achieved with a maximumhardness of 329.6 HV. Results show that about 3 time’s enhancement in the microhardness obtained with the Ni-SiC nanocomposite coating, when compared to the Al7075 substrate.
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