Knowledge of galvanized square pipe

Galvanized square pipe is divided into hot-dip galvanized square pipe and cold-galvanized square pipe according to the production process. It is precisely because of the different processing processes of these two galvanized square pipes that they have many different physical and chemical properties. In general, they vary greatly in strength, toughness and mechanical properties.

Hot-dip galvanized square pipe.

Hot-dip galvanized square pipe: It is a square pipe welded by crimping steel plate or steel strip. On the basis of this square tube, the square tube is placed in the hot dip galvanizing pool, and after a series of chemical reactions, the square tube is formed. The production process of hot-dip galvanized square pipe is relatively simple, the production efficiency is high, and the varieties and specifications are many. The equipment and funds required for planting square pipes are few, which is suitable for manufacturers producing small galvanized square pipes. However, in terms of strength, the strength of this steel pipe is much lower than that of seamless square pipe. Cold galvanized square pipe.

Cold galvanized square pipe is anticorrosive treatment by using the principle of cold galvanized. Different from hot-dip galvanizing, the cold galvanizing layer mainly uses the electrochemical principle to prevent corrosion. Therefore, it is necessary to ensure that the zinc powder is in full contact with the steel to produce the electrode potential difference, so the surface treatment of the steel is very important.

The difference between hot galvanizing and cold galvanizing.

Galvanized square pipe is divided into two categories: hot-dip galvanized square pipe and electric galvanized square pipe. Hot-dip galvanized square pipe has wet method, dry method, lead-zinc method, REDOX method and so on. The main difference between different hot-dip galvanizing methods is which method is used to activate the surface of the pipe after acid leaching cleaning to improve the quality of galvanizing. At present, dry method and REDOX method are mainly used in production, and their characteristics are shown in the table. The surface of electrogalvanizing layer is very smooth, compact and uniform in structure. It has good mechanical properties and corrosion resistance. The consumption of zinc is 60% to 75% lower than that of hot dip galvanizing. Electrogalvanizing technology is complex, but this method must be used for single-sided coating, double-sided coating with different internal and external surface coating thicknesses, and galvanized thin-walled pipes.

Because the galvanized square pipe is galvanized on the square pipe, the application range of galvanized square pipe has been greatly expanded compared with the square pipe. Mainly used in curtain wall, construction, machinery manufacturing, steel structure engineering, shipbuilding, solar power generation bracket, steel structure engineering, power engineering, power plant, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport and so on.

Galvanizing has a stronger protective effect and strong corrosion resistance. The entire structure is made of zinc, forming a dense four-membered crystal. This crystal forms a barrier on the steel plate, thus effectively preventing the penetration of corrosive factors. Corrosion resistance comes from a strong protective barrier layer of zinc. While zinc provides sacrificial protection on the trimmed edges, scratches, and scratched portions of the coating, zinc forms an insoluble oxide layer and performs a barrier protection function.