Hot dip galvanizing
Hot dip galvanizing is a method of galvanization used by Armco. It is the process of coating iron or steel with a thin zinc layer, by passing the steel through a bath of molten zinc at a temperature of around 860°F (460°C). When exposed to the atmosphere, pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate, a dull grey, but fairly strong material that in many circumstances stops further corrosion, protecting the steel below from the elements. Galvanized steel formed by hot dip galvanizing 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, but one must exercise caution around the resulting zinc fumes. Galvanized steel is suitable for high-temperature applications of up to 392°F (200°C). Use at temperatures above this level will result in peeling of the zinc at the inter-metallic layer. Galvanized sheet steel is commonly used in automotive manufacture to enhance corrosion performance of exterior body panels of some models.
Hot dip galvanizing can be used on steel strip in a continuous line. This is extensively used for applications requiring the strength of steel and resistance to corrosion. Armco’s applications include: roofing and walling, safety barriers, handrails, consumer appliances and automotive body parts. One common use is in metal buckets. It is also used in many heating and cooling duct systems in buildings
Armco Superlite South Africa
www.armco.co.za
Call: 011 974 8511
or 011 974 8511
Email: mail@armco.co.za
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