Hot-dip galvanizing of metal tanks involves immersing the steel in a bath of molten zinc at approximately 450°C, creating a metallurgical layer of Fe-Zn alloy. This layer is not simply deposited on the steel but becomes a structural part of it, creating a combined protection: a physical barrier and a cathodic protection system.

This protection is especially valuable in tanks subjected to constant humidity, condensation, or contact with non-aggressive water, since even if a scratch or surface impact occurs during assembly, the zinc is sacrificed to protect the underlying steel. This property significantly extends the tank's lifespan without requiring complex repairs.