![]() ![]() Use at temperatures above this level can result in the peeling of the zinc at the intermetallic layer. Galvanized steel is suitable for high-temperature applications typically up to 392☏ (200☌). The resulting coated steel can be used in much the same way as uncoated. ![]() The process of hot-dip galvanizing results in a metallurgical bond between zinc and steel with a series of distinct iron-zinc alloys, creating a versatile and affordable material for manufacturing ductwork and duct components. Galvanized steel is widely used in ductwork applications where rust resistance is needed and can be identified by the crystallization patterning on the surface (often called a “spangle”). 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, relatively durable material that stops further corrosion in many circumstances, protecting the steel below from the elements. ![]() The steel passes through a molten bath of zinc at a temperature of around 860☏ (460☌). Most ductwork manufactured with galvanized metal is hot-dip galvanized, a process of coating steel with a thin zinc layer.
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