The galvanized pipe can be classified into the following types:

Galvanized steel pipe, Cold galvanized pipe, Hot-dipped galvanized steel pipe.

1. Hot dipped galvanized pipe

Hot dipped galvanized pipe is the molten metal and the reaction of the iron matrix alloy layer, so that both the substrate and the coating combination of hot-dip galvanized pipe is first pickling, in order to remove the iron oxide on the surface of the pipe, pickling, It can be washed by ammonium chloride or zinc chloride solution or ammonium chloride and zinc chloride mixed solution tank and then into the hot dipping tank. The hot-dip galvanization has the advantages of even coating, strong adhesion and long service life.

 2.Cold galvanized pipe

Cold galvanized is also called electro-galvanized, galvanized amount is very small, only 10-50g / m2, its own corrosion resistance is much different from the hot-dip galvanized pipe. Formal galvanized pipe manufacturers, in order to ensure the quality, most do not use electroplating Zinc (cold plating). Only those small-scale, outdated small businesses using electro-galvanized, of course, their prices are relatively cheaper. At present the Ministry of Construction has officially below, out of technology cold galvanized pipe, the future is not allowed to use cold Galvanized pipe for water, gas pipe.

The galvanized pipe characteristic instructions

 1. Hot-dip galvanized steel pipe

The steel pipe matrix and the molten plating bath undergo complicated physical and chemical reactions to form a corrosion-resistant and compact zinc-iron alloy layer, and the alloy layer is integrated with the pure zinc layer and the steel pipe matrix so that its corrosion resistance is strong.

2. Cold galvanized steel pipe

The zinc layer is the electroplating layer, the zinc layer, and the steel pipe matrix separate layer. The zinc layer is thin, the zinc layer simply attached to the steel substrate, easy to fall off, so its corrosion resistance is poor. In the new residential, the prohibition of the use of cold-dip galvanized steel As a water supply pipe.