What is Hot-Dip Galvanizing (HDG)?

Hot-dip galvanizing (HDG) is the process of dipping fabricated steel into a kettle or vat containing molten zinc.  The process is inherently simple which provides a distinct advantage over other corrosion protection methods. While the steel is in the kettle, the iron in the steel metallurgically reacts with the molten zinc to form a tightly-bonded alloy coating that provides superior corrosion protection to steel.

The information throughout this section on durability, longevity, cost, and sustainability applied only to the hot-dip galvanizing (commonly referred to as batch, general, or after-fabrication galvanizing).  It is important to understand not all zinc coatings are created equally; thus, applying any of the information provided about hot-dip galvanizing to other zinc coatings is not accurate or recommended. 

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