Galvanized Steel Pipe
Date:2019-05-15 View(s):1443 Tag:Galvanized Steel Pipe
A galvanized steel pipe is a steel pipe having a hot-dip galvanized or electro-galvanized layer on its surface. Galvanized steel improves corrosion resistance and extends service life. Galvanized steel pipes are widely used in addition to water, gas and oil. They are generally low-pressure fluid line pipes. They are also used in petroleum industry, especially heating oil, marine oil well pipes, pipelines, chemical coking equipment, condensing coolers, coal washing and distillation oil exchange. Pipes, as well as bridge piles, mine tunnel support frames, etc. IPE.
Galvanized steel pipes are divided into cold-dip galvanized pipes and hot-dip galvanized pipes. Among them, galvanized steel is widely used. Hot-dip galvanized steel is widely used in construction, machinery, mining, chemical, railway vehicles, automobile industry, roads, bridges, containers. , sports facilities, agricultural machinery, petroleum machinery, etc. Exploration machinery and other manufacturing industries. The hot dip galvanized tube is a molten metal that reacts with the iron matrix alloy layer to bond the substrate to the coating. The galvanized pipe is first pickled, in order to remove the iron oxide on the steel surface, after pickling, the ammonium chloride or zinc chloride aqueous solution in the tank is mixed with zinc chloride or ammonium chloride solution, and then placed in the hot dip tank. in. Zinc plating has the advantages of uniform plating, strong adhesion and long life. The complex physical and chemical reaction between the hot-dip galvanized steel substrate and the molten pool forms a tight layer of corrosion-resistant zinc-iron alloy structure. Alloy layer and pure zinc layer, steel based mixture. Therefore, it is resistant to corrosion.
Galvanized steel is designed to prevent corrosion of objects, thereby increasing the corrosion resistance and service life of the steel. At the same time, in order to increase the decorative appearance of the product, the growth of the steel may be weathered, water or soil erosion over time. Corroded steel accounts for about one-tenth of the total domestically, so galvanized steel is generally used for protection of life or steel. Because zinc is not easily changed in dry air, and in a humid environment, a more basic film of zinc carbonate is produced, which protects internal parts from corrosion and damage, even if the zinc layer is destroyed by some factors. The combination of zinc and steel for a period of time forms a microbattery, leaving the cathode and the steel substrate to be protected.
Hot-dip galvanizing process:
Degreasing of workpiece→cleaning→acid washing→cleaning→drying solvent dipping flux preheating hot galvanizing→cooling→finishing→cleaning→drying→passivation test
Chemical degreasing→washing→hot water electric degreasing oil→washing→washing→strong corrosive galvanized iron alloy→washing→washing→light washing→washing→dry passivation