The choice of steel plays a big role: steels are used of class 1 supporting the aspect and the mechanical resistance of the coating. However some defects inherent in hot galvanization must be accepted, such as cords of the weldings that one should not deteriorate with sandpapering, of the visual aspects chechmates with possibility of marbled or rough zones and of light run zinc visible along the sections without consequences on the behaviour with corrosion
Alloy of zinc presents hardness higher of 50% than which of basic steel, which guarantees an excellent resistance of the coating to the shocks, the abrasion and the test of gritting. The immersion in a liquid bath makes it possible to cover with a protective coating outside and the interior of the hollow parts, thus guaranteeing a protection supplements in particular for :
Butts and crosses of welding of the panels.
Interior of the profiles of the gates and grids like their weldings.