Hot dip galvanizing offers a double protection to steel: an electrochemical protection cathodic effect which does not let corrosion extend in the event of surface wound and a physical protection barrier by screen which insulates steel. The lifespan of galvanization depends on two parameters:
– The thickness of the zinc coating.
– The place of use of the products; rural, marine, urban,…
As an indication and according to these criteria the average longevity of the zinc coating varies between 10 and 30 years
Flux coating is last process before zinc coating, we need to look content of flux in here. Flux, before zinc coating, consists of %50 zinc chloride and %50 amonium chloride alloy. These two chemicals have same function. Amonium chloride provides metal surface not to be oxidized until inserting zinc pondage and burns on zinc pondage. Zinc chloride simplifies sticking zinc by coating metal surface.