What is the difference between galvanized square tubes and cold galvanized

Time:2023-03-24popularity:223

When we talk about galvanized square tubes, there must be cold galvanizing. What is the difference between them? Let's take a look at the differences between them.

Galvanized square tubes convert molten metal materials and iron into an aluminum alloy layer to bond the substrate and coating. Galvanizing is the process of first pickling steel pipes. In order to remove iron oxide from the surface of the steel pipes, after pickling, they are cleaned with ammonium chloride or zinc chloride aqueous solution or a mixture of ammonium chloride and zinc chloride aqueous solution, and then sent to the galvanizing tank. Galvanizing has the advantages of uniform coating, strong adhesion, and long service life.

The cold galvanized square tube is electrically galvanized, with a small amount of zinc plating, only 10-50 g/m2. Its corrosion resistance is greatly different from that of hot-dip galvanized pipes. In order to ensure quality, most regular galvanized pipe manufacturers do not use galvanizing. Only small enterprises with small scale and outdated equipment will use galvanizing, and of course, their prices are relatively cheap.

Galvanized square tube: A diversified chemical reaction occurs between the steel pipe substrate and the molten pool, forming a zinc iron alloy layer with a high-density corrosion resistant structure. The alloy layer combines with the pure zinc layer and the steel pipe substrate, providing strong corrosion resistance. Cold galvanized square pipe: The zinc layer is an electroplated layer, which is separated from the steel pipe substrate. The zinc layer is thin and easy to fall off. Therefore, its corrosion resistance is very poor. According to the China Iron and Steel News Network, it is generally prohibited to use cold galvanized steel pipes as water supply pipes in new buildings.


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