Which metal is used in building construction primarily as a coating to protect metal parts from rust and corrosion?

Zinc is widely used in building construction primarily as a protective coating for metal parts to prevent rust and corrosion. This process is known as galvanization, where zinc is typically applied to iron or steel surfaces. The zinc layer acts as a sacrificial anode; it corrodes in place of the underlying metal, thereby prolonging the life of the metal components protected by it. This is especially important in construction, where structural integrity is critical and exposure to the elements can accelerate corrosion.

The use of zinc coatings is prevalent in various applications, including roofs, gutters, and other structural elements that may be exposed to moisture. This protective measure is essential for maintaining the stability and durability of metal components over time, particularly in environments that are prone to humidity or water exposure.