After aircraft metal is manufactured, it is immediately protected with corrosion resistant alloy and coated with various metals, paints, and chemical conversions.
Further it requires continual inspections and preventative maintenance to keep the aircraft metal from corroding and needing to be replaced.
The most important means for preventing corrosion is to keep aircraft free of moisture.
A thorough rinsing and cleaning of aircraft will remove salt and other corrosive agents. Exposed areas such as the landing gear and cooling vents need extra attention, as well as any other joints, gaps, and hinges where debris collects.
Chipped or delaminating paint needs to be properly striped or sanded and re-painted.
Industrial-grade protectants and lubricants help seal the metal against moisture, and need to be periodically applied to aircraft.
During severe weather or wet conditions, aircraft should be covered and sheltered. It is important to keep some form of ventilation, so moisture does not accumulate.
With proper inspections and preventative maintenance, the risk of aircraft corrosion can be minimised.