Final answer:
Corrosion is a galvanic process by which metals deteriorate through oxidation. The exposure of an aircraft to corrosion damage is greatest when the aircraft is dirty, inactive, or being stored in a location with high humidity or salt content.
Step-by-step explanation:
Corrosion is a galvanic process by which metals deteriorate through oxidation-usually but not always to their oxides. When exposed to air, iron rusts, silver tarnishes, and copper and brass acquire a bluish-green surface called a patina. The exposure of an aircraft to corrosion damage is greatest when the aircraft is dirty, inactive, or being stored in a location with high humidity or salt content.