Articles
  • Response surface methodology optimization of pulse electrodeposited Ni- nano SiC coatings on Al 7075 substrate

  • S. Sankar Ganesha,* and A. Jeganb

  • aDepartment of Mechanical Engineering, Government College of Engineering, Tirunelveli–627007, Tamilnadu, India
    bDepartment of Mechanical Engineering, AVS College of Technology, Salem – 636 106, Tamilnadu, India

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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-factor central 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 is developed to predict the microhardness of the developed coating using design expert software and optimal parameters for achieving maximum microhardness were found out. The morphology of the nano SiC coating was investigated using FESEM coupled with EDAX, and X-ray diffractometer. Corrosion studies were carried out using Potentiometric polarization and Electrochemical Impedance tests, and the corrosion results show that corrosion potential for the aluminium alloy is -0.92 V and for the Ni- nano SiC coating it increases to -0.65 V. Tafel and Nyquist plots reveal the improved corrosion characteristics of the pulse plated Ni-SiC coating. Significant improvement in the microhardness of the coating is achieved with a maximum hardness of 329.6 HV. Results show that about 3 time’s enhancement in the microhardness obtained with the Ni-SiC nano composite coating, when compared to the Al7075 substrate


Keywords: AL 7075, Ni-SiC nano composite coating, Microhardness, Corrosion resistance, Pulse electrodeposition

This Article

  • 2023; 24(3): 486-494

    Published on Jun 30, 2023

  • 10.36410/jcpr.2023.24.3.486
  • Received on Jan 24, 2023
  • Revised on Apr 28, 2023
  • Accepted on May 18, 2023

Correspondence to

  • S. Sankar Ganesh

  • Department of Mechanical Engineering, Government College of Engineering, Tirunelveli–627007, Tamilnadu, India
    Tel : +91-8807266386

  • E-mail: sankarganesh@gcetly.ac.in