Kuumalämpögalvanoidun

Kuumalämpögalvanoidun, often shortened to hot-dip galvanizing, is a corrosion protection process for steel and iron. The process involves immersing a fabricated steel or iron article into a bath of molten zinc. This creates a metallurgical bond between the zinc and the base metal, forming a robust, multilayered coating. The outer layer consists primarily of zinc, with subsequent layers of zinc-iron alloys of varying compositions.

This coating provides protection through two primary mechanisms. First, it acts as a physical barrier, preventing corrosive substances from reaching the steel. Second, zinc is more electrochemically active than iron. If the coating is scratched or damaged, exposing the steel, the zinc will preferentially corrode, sacrificing itself to protect the underlying steel. This is known as galvanic protection.

The hot-dip galvanizing process is known for its effectiveness and durability, providing long-term corrosion resistance in a wide range of environments, from rural to industrial and even marine settings. The thickness and uniformity of the coating are generally excellent, providing protection even to edges, corners, and internal surfaces of hollow sections. It is a widely used method for protecting structural steel, rebar, fasteners, and various other steel components. The process is also relatively cost-effective when considering the extended lifespan it provides to steel products.