Which of the following is a common method of surface treatment?

Galvanization is indeed a common method of surface treatment, primarily utilized to prevent corrosion in metals, particularly steel and iron. The process involves coating the base metal with a layer of zinc, which acts as a sacrificial anode. This means that even if the coating is scratched or damaged, the zinc will corrode instead of the underlying metal, thus providing a durable protective layer. Galvanization is widely used in various applications, including construction materials, automotive parts, and outdoor structures, making it a significant process in enhancing the longevity and durability of metal products.

Other methods listed, while important in their respective contexts, serve different functions. Electroplating is also a surface treatment but focuses on depositing a layer of metal onto a substrate for decorative or enhanced surface properties. Annealing is a heat treatment process aimed at altering the physical properties of material, typically to relieve stress or improve ductility, rather than directly providing a surface treatment. Forging is a forming process that shapes metal by applying forces, important in creating structural elements, but not classified as a surface treatment.