DeBartolo and Hillberry [8] established that in many aluminum alloys used in the aircraft industry, fatigue cracks
could be nucleated not only at macroscopic defects, such as machining marks and corrosion damage, but also at
cracked constituent particles inherent to the alloy, formed during the solidification process.
In recent investigation, K Brunelli et all [9] made a research on Ni coated and subsequent diffussion heat
treatments studies for Al 7075 with Ni coatings of different thickness on electrolyitc and electroless process. EN
coated Aluminium was investigated for its tribological properties through experimental methods and strength
through Finite Element Analysis [10]. Fatigue behavior of a 7075-T6 aluminum alloy coated with an electroless Ni–
P (EN) deposit, in the as-plated condition, of approximately 38–40 μm in thickness and a high P content, of
approximately 18 wt%. The results obtained, show that the EN coating can give rise to a significant improvement in
the fatigue and corrosion–fatigue performance of the substrate, depending on the testing conditions.