hotdipped

Hotdipped refers to a surface treatment process primarily applied to metals, most commonly steel and iron. The process involves immersing the fabricated metal component into a bath of molten zinc. This molten zinc metallurgically bonds with the base metal, forming a protective alloy layer and then a layer of pure zinc on the surface. This coating provides excellent corrosion resistance, making hotdipped products suitable for use in outdoor or harsh environments.

The hotdip galvanizing process typically involves several stages. First, the metal is cleaned to remove any grease, oil, or scale. This is usually achieved through degreasing and pickling in an acid solution. Following cleaning, the metal is fluxed, which is a chemical treatment that further cleans the surface and prevents oxidation during the dipping process. The cleaned and fluxed metal is then immersed in a bath of molten zinc, heated to approximately 450 degrees Celsius (840 degrees Fahrenheit). The duration of immersion depends on the size and type of the object being coated.

Once removed from the zinc bath, the component cools, and the molten zinc solidifies into a tough, durable coating. This coating can vary in thickness and appearance depending on the specific application and the steel's composition. Hotdipped coatings are known for their ability to provide cathodic protection, meaning that even if the coating is scratched, the zinc will preferentially corrode, protecting the underlying steel from rust. Common applications include structural steel, guardrails, fencing, pipes, and various automotive and construction components.