The Sendzimir treatment is a hot-dip galvanising process. Starting with a pickled material, i.e. one that has been stripped of oxide and scale, a galvanising process is then carried out in a molten zinc bath at 700°C. Obviously, this treatment isolates the steel from external corrosives and the amount of zinc on the surface can vary depending on the application in the order of microns (µ) per mm².
In rural areas, far from the coast, a loss of 1 µm/year is expected, which can increase to between 4 and 8 µm/year in areas with high humidity or coastal areas with high salinity.
Tests to calculate the tightness of the zinc are carried out in an extreme environment with salt spray, and give results in hours. The difference between these materials lies in their coating and therefore their resistance to oxidation:
Sendzimir 🡪 approx. 250 hours
Aluzinc 🡪 approx. 500 hours
Magnelis 🡪 approx. 1000 hours