Now the main method of galvanizing the surface of the channel is hot-dip galvanizing. Hot-dip galvanizing has evolved from the older hot-dip method, which has been in existence for 170 years since 1836 when it was applied to industry. However, nearly 30 years, with the rapid development of cold-rolled strip, hot-dip galvanizing industry has been large-scale development.

In various coating methods to protect the steel substrate, hot-dip zinc is a very good one. It is in the liquid state of zinc, after a very complex physical and chemical effects, the steel is not only coated with a thick layer of pure zinc, but also generate a zinc-iron alloy layer. This plating method, not only has the corrosion resistance of electro-galvanized, but also because of the zinc-iron alloy layer. Also has galvanic can not be compared to the strong corrosion resistance. Therefore, this plating method is especially suitable for all kinds of strong acid, alkali mist and other strong corrosion environment.