What is Galvanized Steel Pipe Meaning?

Galvanized pipes are divided into hot-dip galvanized pipes and cold galvanized pipes:

Hot dipped galvanized pipe

Hot dip galvanized pipe is to make molten metal react with iron matrix to produce alloy layer, so as to combine the matrix and coating. Hot dip galvanizing is to pickle the steel pipe first. In order to remove iron oxide on the surface of the steel pipe, after pickling, it is cleaned in ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. The hot-dip galvanized steel pipe has a complex physical and chemical corrosion-resistant structure due to the close reaction with the molten zinc plating solution. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix, so it has strong corrosion resistance. The zinc layer is generally 80-600g / m2 or even higher

Cold galvanized pipe

The cold galvanized pipe adopts electro galvanizing, with less galvanizing amount of 10-50g / m2. Its corrosion resistance is not as good as that of hot-dip galvanized pipe, but it has good welding performance and low price. It is mainly used for fire water and ordinary frame structure.

Instructions

Galvanized pipes are not suitable for drinking water pipes. After several years of use, rust and scale will be generated in the pipes. The yellow water will not only pollute the sanitary ware, but also mixed with bacteria growing on the unsmooth inner wall. Corrosion will cause high content of heavy metals in the water and endanger human health.

Rust removal method

1. Clean the steel surface with solvent to remove the organic matter on the surface,

2. Then use tools to remove rust (wire brush) to remove loose or inclined scale, rust, welding slag, etc,

3. Use pickling.