What happens to aluminum in the rain?

When exposed to rain, aluminum undergoes a process called oxidation, forming a thin layer of aluminum oxide on its surface. This oxide layer acts as a protective barrier, preventing further corrosion and degradation of the metal. Over time, however, prolonged exposure to acidic or salty rain can gradually erode this protective layer, leading to eventual corrosion of the aluminum surface. Regular maintenance and protective coatings can help mitigate this effect.