Corrosion behaviour of SiC and Al2O3 reinforced Al 7075 hybrid aluminium matrix composites by weight loss and electrochemical methods |
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| Institution: | 1. Department of Mechanical Engineering, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, Tamilnadu, 630003, India;2. Department of Chemistry, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, Tamilnadu, 630003, India;1. Selvamm Arts and Science College, Namakkal, 637 003, Tamilnadu, India;2. Adiyamaan College of Engineering, Hosur, 635 209, Tamilnadu, India;3. Department of Physics, Periyar University, Salem, 636 011, Tamilnadu, India;1. Department of Mathematics, College of Engineering and Technology, Srinivas University, Mangalore, 574146, India;2. Department of Mathematics, Bapuji Institute of Engineering & Technology, Davanagere, 577004, India;3. Department of Computer Science & Engineering, Bapuji Institute of Engineering & Technology, Davanagere, 577004, India;4. Department of Chemistry, College of Engineering and Technology, Srinivas University, Mangalore, 574146, India;1. Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran;2. Department of Chemistry, Quchan Branch, Islamic Azad University, Quchan, Iran;1. Department of Engineering Chemistry, Andhra University, Visakhapatnam, India;2. Department of Chemistry, Adikavi Nannaya University, Rajahmundry, India;3. Department of Chemical Engineering, Andhra University, Visakhapatnam, India;4. Department of Chemistry, KGRL College, Bhimavaram, India;5. Department of Chemistry, P. R. Government College (A), Kakinada, 533001, A. P., India;6. Department of Engineering Physics, AUCE (A), Andhra University, Visakhapatnam, India;1. Department of Chemistry, Faculty of Sciences, Aydin Adnan Menderes University, 09010, Aydin, Turkey;2. Department of Physics, Faculty of Sciences, Aydin Adnan Menderes University, 09010, Aydin, Turkey;3. Technical Sciences Vocational School, Gazi University, Ostim, Ankara, 06374, Turkey |
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| Abstract: | The corrosion study of Al 7075 hybrid metal matrix composites reinforced with equal weight percents (2.5, 5, 7.5, and 10) of silicon carbide and aluminium oxide is investigated in the present work by weight loss and electrochemical methods. In this study, composite specimens prepared by the squeeze casting technique were analyzed at room temperature to estimate the rate of corrosion in a 3.5% NaCl solution for various intervals using the weight loss method. As a consequence, a hybrid Al7075 composite reinforced with 10% SiC and 10% Al2O3 had a lower corrosion rate of 0.9997 mmpy than pure Al7075, which had a maximum corrosion rate of 3.4481 mmpy. The corrosion rate of hybrid composites is determined by the tafel polarization method and the electrochemical impedance spectroscopic method. These experiments showed that the corrosion rate of the hybrid metal matrix composite Al7075 + 10% SiC +10% Al2O3 was 0.630 mmpy less than that of the monolithic 7075 alloy. The corrosion morphology behaviour of the Al 7075 and their hybrid composite samples is observed by SEM. The SEM micrographs implied that SiC and Al2O3 reinforcements with the matrix alloy produced good interfacial and intermetallic bonding and hence decreased the corrosion rate. |
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| Keywords: | Al 7075 Aluminium oxide Corrosion rate Electrochemical method Silicon carbide Weight loss method |
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