Which method is commonly used to prevent corrosion in metal structures?

Which method is commonly used to prevent corrosion in metal structures?

• A. Anodising for aluminium.
• B. Protective coatings (paint) and galvanizing.
• C. Removing humidity completely.
• D. Use non-metal parts only.

Answer: (B)

Protecting metal structures from corrosion relies on keeping moisture and oxygen away from the metal or making the metal less prone to oxidation. The most common and practical approach is protective coatings (like paint) and galvanizing. A protective paint system forms a continuous barrier that blocks water and air from reaching the metal surface and can be repaired when damaged, making it suitable for a wide range of structures and environments. Galvanizing—the application of a zinc coating to steel—provides sacrificial protection: zinc corrodes first, so even if the coating is scratched, the exposed steel remains protected longer. This combination is widely used because it is cost-effective, durable, and practical for large, complex metal structures. Anodising is a method used mainly on aluminium to form a protective oxide layer, but it isn’t a universal solution for all metals. Completely removing humidity isn’t feasible in real-world settings, and using non-metal parts does not stop the corrosion of metal components.

Protecting metal structures from corrosion relies on keeping moisture and oxygen away from the metal or making the metal less prone to oxidation. The most common and practical approach is protective coatings (like paint) and galvanizing. A protective paint system forms a continuous barrier that blocks water and air from reaching the metal surface and can be repaired when damaged, making it suitable for a wide range of structures and environments. Galvanizing—the application of a zinc coating to steel—provides sacrificial protection: zinc corrodes first, so even if the coating is scratched, the exposed steel remains protected longer. This combination is widely used because it is cost-effective, durable, and practical for large, complex metal structures. Anodising is a method used mainly on aluminium to form a protective oxide layer, but it isn’t a universal solution for all metals. Completely removing humidity isn’t feasible in real-world settings, and using non-metal parts does not stop the corrosion of metal components.