Enhancement of Surface Roughness and Corrosion Resistance of Wedmed Al 7075 Alloy 
B Rajnaveen1, G Rambabu2, D Balaji Naik3, Abdul Silar Babu4
1B Rajnaveen*, Mechanical Engineering department, Andhra University, Vishakapatnam, India.
2Dr G Rambabu, Mechanical Engineering department, Andhra University, Vishakapatnam, India.
3D Balaji Naik, Mechanical Engineering department, Andhra University, Vishakapatnam, India.
4Abdul SilarBabu, Mechanical Engineering department, Andhra University, Vishakapatnam, India.
Manuscript received on November 12, 2019. | Revised Manuscript received on November 25, 2019. | Manuscript published on 30 November, 2019. | PP: 4943-4947 | Volume-8 Issue-4, November 2019. | Retrieval Number: C5883098319/2019©BEIESP | DOI: 10.35940/ijrte.C5883.118419
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: An alloy of Aluminium has good properties and strong would be ideal for many applications. Among all the series of aluminium alloys, Al 7075 is extensively used in aircraft structures, gear shafts, and automotive industry because of its high strength and good corrosion resistance. The machining of Al 7075 can be done under annealed conditions and lubricants are used for operations. In the present work, Al 7075 was machined by using Wire Electric Discharge Machine (WEDM) and investigated the effect of operating parameters on reponses. The surface roughness and corrosion resistance are considered as responses. The operating parameters of WEDM considered in this work are pulse ON time, pulse OFF time, wire feed and servo voltage. Experiments were conducted according to the Taguchi’s design of orthogonal array L18 (21×33). The values of surface roughness and corrosion pit potentials were observed for each experiment to understand the relationship. Multi-objective optimization for these process parameters has been carried out by Grey Relation Analysis (GRA). From this technique, the optimum combination of process parameters are obtained and corresponding values of surface roughness and corrosion pit potentials are found out. To validate the response table for grey relation grade obtained from GRA, Taguchi analysis was carried out which shows that the pulse on time is the most influencing parameter followed by pulse off time, wire feed and servo voltage.
Keywords: Al 7075 Alloy, Surface Roughness, Corrosion Resistance, Taguchi Design, Grey Relational Analysis.
Scope of the Article: Analysis of Algorithms and Computational Complexity.