Corrosion is the gradual breakdown of materials, especially metals, over time. It occurs when materials react with substances in the environment such as air, water, or soil. Corrosion can change the surface and structure of materials. It is often seen as damage or wear.

Corrosion is found in structures like bridges, pipes, vehicles, and buildings around the world. It affects many types of metals used in construction and manufacturing. Different environments can lead to different forms of corrosion.

Corrosion happens over time in natural and built environments. It is observed in many regions and climates. This process is part of how materials change in different conditions.