Alabama Contractors License Practice Exam

What is the main purpose of using galvanized fasteners?

1. To enhance aesthetics

2. To prevent rust

3. To reduce weight

4. To improve conductivity

The correct answer is: To prevent rust

The main purpose of using galvanized fasteners is to prevent rust. Galvanization involves the coating of steel or iron fasteners with a layer of zinc, which acts as a protective barrier against moisture and corrosion. This is particularly important in construction and outdoor applications where exposure to the elements can lead to significant deterioration over time. By providing this protective coating, galvanized fasteners significantly increase the lifespan of the hardware and the structure in which they are used. In addition to the effectiveness of the zinc coating in stopping moisture from reaching the underlying metal, even if the zinc layer becomes damaged, the exposed steel is less likely to corrode because the zinc serves as a sacrificial anode that will corrode in place of the base metal. This attribute makes galvanized fasteners ideal for use in environments where the risk of rusting is high. Aesthetics, weight reduction, and conductivity do not play a primary role in the selection of galvanized fasteners. While galvanized fasteners may have a certain appearance, their primary function is protective rather than aesthetic. Moreover, the weight of the fasteners is not significantly altered by galvanization, and the zinc coating does not improve conductivity, which is more relevant in electrical applications where materials like copper are typically used.