1. Introduction
Aluminum and its alloys have found widespread applications in automobile and aerospace industries,
because of their excellent properties such as high strength to weight ratios, high thermal conductivity and good
corrosion resistance. High strength aluminum alloys, such as 7075-T6, are widely used in aircraft structures due to their high strength-to-weight ratio, machinability and low cost. These are widely used for high strength structural
applications such as aircraft wing skins and internal supporting members as well as missile components and
automobile industries [1-7]. However, due to their compositions, these alloys are susceptible to corrosion. Corrosion
is a major concern involving the structural integrity of aircraft structures. Corrosion has been shown to reduce the
life expectancy of these structures considerable. Aircraft, during normal operation, are subjected to natural corrosive
environments due to temperature, humidity, rain, and seawater.