Product Description

Hot-dip galvanizing is a form of galvanization. It is the process of coating iron steel or aluminum with a thin zinc layer, by passing the metal through a molten bath of zinc at a temperature of around **0 °F (**0 °C). When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen to form zinc oxide , which further reacts with carbon dioxide to form zinc carbonate , a usually dull grey, fairly strong material that stops further corrosion in many circumstances, protecting the steel below from the elements. Galvanized steel is widely used in applications where rust resistance is needed, and can be identified by the crystallization patterning on the surface (often called a spangle).
The process of hot-dip galvanizing results in a metallurgical bond between zinc and steel with a series of distinct iron-zinc alloys. The resulting coated steel can be used in much the same way as uncoated. Galvanized steel can be welded; however, one must exercise caution around the resulting zinc fumes. Galvanized steel is suitable for high-temperature applications of up to **2°F (**0°C). The use of galvanized steel at temperatures above this will result in peeling of the zinc at the intermetallic layer. Electro galvanized sheet steel is often used in automotive manufacturing to enhance the corrosion performance of exterior body panels, this is however a completely different process.
Lead is often added to the molten zinc bath to improve the fluidity of the bath (thus limiting excess zinc on the dipped product by improved drainage properties), helps prevent floating dross, makes dross recycling easier and protects the kettle from uneven heat distribution from the burners. Lead is either added to primary Z1 Grade Zinc or already contained in used secondary zinc.
Steel strip can be hot-dip galvanized in a continuous line. Hot-dip galvanized steel strip (also sometimes loosely referred to as galvanized iron) is extensively used for applications requiring the strength of steel combined with the resistance to corrosion of zinc. Applications include: roofing and walling, safety barriers, handrails, consumer appliances and automotive body parts. One common use is in metal pails. Galvanized steel is also used in most heating and cooling duct systems in buildings