Slower cooling rates, such as those experienced with air cooling or even with thicker sections that have been water quenched, allow the zinc/iron alloying reaction to continue. The inner alloy layers will use the outer Eta layer for their supply of zinc causing the coating to become dull, matte gray.

Quickly reducing the temperature to less than 300 degrees Fahrenheit will halt the galvanizing reaction and minimize the formation of dull or matte surfaces.

The chemical composition of the steel The surface condition of the steel Bath immersion time Bath withdrawal rate Steel cooling rate

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