With the evolved methods of today, where the steel is only etched on the surface, the fluxing have a broader meaning. Through the safety margin, as is composed for the iron/zinc-reaction, it also has become a buffer and a guarantee that no iron is added to the zinc melt.
The flux coating also has a meaning when the goods are stored in a buffer zone before galvanization, since it gives a good protection against corrosion.
Because of this it is of greatest importance that the flux system is shaped so that it can perform a firsthand total reduction of all iron added from rinse tubs, light grazing or that which is released from the goods in the flux bath.
The parameters that a well working flux system has to fulfill is: