Cooling the final and sustainable process
Cooling in hot dip galvanizing is a process that follows the entire treating procedure. We proceed by extracting the artifacts from the hot dip galvanizing bath while the liquid metal gets drained. These last subsequent steps to the galvanizing and coating processes’ fundamental set of operations require serious attention to avoid the forming of excessive zinc accumulations or blemishes caused by drops that solidify during drainage.
Items get extracted and cleaned from any dripping, then allowed to cool off. Such cooling treatment occurs thanks to either air or water contact, depending on a series of factors, among them the need to prevent eventual deformations or to stop the ongoing reaction. In fact, reactions keep going at 200°C and the protecting layer continues to develop, albeit at a slower pace. Under certain circumstances, the continuous kinetics between the two metals creates relevant defects to the point that cooling becomes essential.
It is expected in modern facilities to be possible, even during the cooling phase, to retrieve a great amount of heat that would otherwise go to waste. This is a good practice on the sustainability path.