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25 November 2022
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Corrosion is actually one of the main problems in aircrafts. In Mauritius, the international airport at Plaisance is situated at 250m from the shoreline and has a relative humidity level frequently above 85%. These factors would inevitably increase the amount of corrosion in aircrafts. This study was therefore performed to investigate the types of corrosion encountered and the cost of corrosion in one of the aircrafts of the Mauritian national fleet. The aircraft chosen was delivered in 1994. The required data were collected from three complete maintenance checks performed after 11393, 39465 and 63282 flying hours. Aluminium alloy 7075, which is used on the aircraft fuselage, was immersed in sea water to investigate its effect on the metal.Various types of corrosion attacks were observed in various parts of the aircraft during the maintenance checks considered. During immersion in sea water, the aluminium 7075 sample suffered from serious pitting corrosion. Finally, the cost of corrosion peaked up to $217900 in the maintenance task performed after 39465 flying hours, indicating that better corrosion control is an important factor in decreasing maintenance costs.
