Car bumpers are usually made of metal materials such as steel or aluminum alloy. When the protective layer on the surface of the bumper is damaged or worn, the metal is exposed to air, moisture and other environmental factors, and it is prone to oxidation reaction, forming rust. Therefore, car bumpers will rust under certain conditions.

  The main factors that lead to the rusting of car bumpers include:

  1. Road salt and chemicals: In cold regions, salt and chemicals are often used on roads to melt snow and ice. These substances will contact the bumper and promote the occurrence of rust.

  2. Humidity and moisture: Auto bumpers in humid environments are more susceptible to corrosion. Moisture can seep into tiny damages or cracks in the surface of the bumper and come into contact with the metal causing an oxidation reaction.

  3. Physical damage: Impacts, scratches or other physical damage may strip or destroy the protective layer on the bumper surface, exposing the metal to the external environment and making it susceptible to oxidation and rust.

  To reduce the risk of auto bumper rusting, it is recommended to regularly inspect the surface of the bumper, repair any surface damage, keep it well cleaned and maintained, and avoid prolonged exposure to wet and corrosive environments where possible. Additionally, some automakers offer bumpers with additional anti-rust coating or anti-rust treatment options that can improve the bumper's durability and resistance to rust.