IMPROVEMENT IN HARDNESS AND ELECTROCHEMICAL CORROSION RESISTANCE OF AL-7075 ALLOY BY ARTIFICIAL AGEING

Rabia Mukhtar, Naveed Afzal, Mohsin Rafique and Ameeq Farooq
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Rabia Mukhtar: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Naveed Afzal: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Mohsin Rafique: Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
Ameeq Farooq: ��Corrosion Control Research Cell, Institute of Metallurgy and Materials Engineering, Faculty of Chemical and Materials Engineering, University of the Punjab, Lahore, 54590, Pakistan

Surface Review and Letters (SRL), 2022, vol. 29, issue 03, 1-10

Abstract: Artificial ageing of Al-7075 alloy was performed in a muffle furnace at different temperatures ranging from 120∘C to 190∘C for 3h. The formation of MgZn2 precipitates in the aged alloy was confirmed through the XRD data. The lattice parameter and crystallite size of aluminum were increased with the increase of the ageing temperature. The scanning electron microscopy results validated the precipitates of different shapes and sizes in the aged samples. The number density of the precipitates was found to be maximum at 170∘C. The Vickers hardness of Al-7075 alloy was increased from 125HV to 172HV with an increase of the ageing temperature from 120∘C to 170∘C and then decreased at 190∘C. The electrochemical tests of the un-aged and aged samples (in 3.5wt.% NaCl solution) showed a decrease in the corrosion rate (0.003mm/y) and an increase in the corrosion potential (−137mV) of the alloy upon ageing up to 150∘C, indicating improvement in its corrosion resistance.

Keywords: Ageing heat treatment; Al–Zn–Mg alloy; surface; mechanical properties; corrosion (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218625X2250038X

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