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Continuous Galvanized Production Line

Hot-dip galvanization is a form of galvanization. It is the process of coating iron and steel with zinc, which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 840 °F (449 °C). When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O2) to form zinc oxide (ZnO), which further reacts with carbon dioxide (CO2) to form zinc carbonate (ZnCO3), a usually dull grey, fairly strong material that protects the steel underneath from further corrosion in many circumstances. Galvanized steel is widely used in applications where corrosion resistance is needed without the cost of stainless steel, and is considered superior in terms of cost and life-cycle.

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Continuous galvanized production line

·         Degreasing: The process of degreasing means a hot alkaline or caustic solution removes dirt, oil, grease and soluble markings.

·         Pickling: After the process of degreasing, the next step is pickling where a dilute solution of hot sulfuric acid removes surface rust and mill scale to provide a chemically clean metallic surface. This pickling process, heated to about 150 ° F, attacks the base steel, getting beneath the rust and scale to achieve the adequate cleaning passes through the zinc.

·         Fluxing: After pickling and rinsing, the surface of steel article is extremely active and therefore, quickly oxidizes to form thin layer of oxide. This oxide not only hinders the coating formation but also costs galvanizers dearly by increasing the dross generation.

·         Galvanizing: The article is immersed in a bath of molten zinc at between 435-455 C. During galvanizing, the zinc metallurgically bonds to the steel, creating a series of highly abrasion-resistant zinc-iron alloy layers, commonly topped by a layer of impact-resistant pure zinc.

·         Inspection: At last the Coating thickness and surface condition inspections complete the process to ensure conclusion with specification. Electronic gauges are used to give quick and accurate measurement readings of the coating.

·         Inspection: At last the Coating thickness and surface condition inspections complete the process to ensure conclusion with specification. Electronic gauges are used to give quick and accurate measurement readings of the coating.



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