Wednesday, December 21, 2011


HOT-DIPPED GALVANIZING requires vent holes in all closed channel or pipe prior to dipping, which allows galvanizing to occur both inside and out.  The metallic coating produced by the hot-dipped galvanizing process is the result of a metallurgical reaction called diffusion. The finished product consists of four layers adhered to the steel. The outer layer is pure zinc and the three inner layers are separate intermetallic layers that are metallurgically bonded to each other and the steel. The galvanized coating literally becomes part of the steel substrate, thus creating a superior adhesion bond between the two materials, which provides excellent abrasion resistance. Hot-dipped zinc galvanizing provides cathodic protection to the underlying steel. This means that in the event of a scratch or chip (1/4" length and/or width) the zinc will corrode instead of the steel. Hot-dipped galvanization substantially increases the useful life of steel.

Added by Nasir 12/31/2011
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 860 °F (460 °C).

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