Forróhorganyzáskor

Forróhorganyzáskor, which translates to hot-dip galvanizing in English, is a widely used process for applying a protective zinc coating to steel or iron to prevent rust. The method involves immersing the fabricated steel or iron parts into a bath of molten zinc, typically at temperatures around 450 degrees Celsius (842 degrees Fahrenheit). This immersion process allows the zinc to metallurgically bond with the base metal, forming a series of zinc-iron alloys at the interface, with a pure zinc outer layer. This multi-layered coating provides excellent corrosion resistance.

The steel or iron articles typically undergo a pre-treatment process before being dipped. This usually includes cleaning to remove grease and oil, followed by pickling in an acid solution to remove mill scale and rust. A flux coating is often applied to further clean the surface and prevent oxidation during heating. After galvanizing, the material is cooled, and any excess zinc may be removed.

Hot-dip galvanizing is favored for its durability, providing a long service life even in harsh environments. The coating offers cathodic protection, meaning that even if the zinc layer is scratched and the base steel is exposed, the zinc will corrode preferentially, protecting the steel from rusting. This makes it a cost-effective and robust solution for a wide range of applications, including structural steel, guardrails, pipes, and agricultural equipment. The process is also relatively simple and can coat complex shapes effectively.