Aluminum coils and iron coils differ in material composition, weight, strength, and applications. Aluminum coils are made of aluminum, a lightweight, corrosion-resistant metal, while iron coils are made from iron, which is heavier and more prone to rust. Aluminum coils have a lower density, making them ideal for applications where weight is a concern, such as in construction or automotive industries. They also have excellent electrical and thermal conductivity. Iron coils, on the other hand, are stronger and more durable, making them suitable for heavy-duty applications like construction reinforcement and machinery parts. Iron is also magnetic, which is an advantage in certain applications. However, iron is more susceptible to corrosion and requires protective coatings or treatments to extend its lifespan.