Comportement des tôles revêtues d'une couche de zinc allié

Results on development of alloyed zinc coated steel sheets

Ingénieur C.N.A.M., Aciérie et Laminoirs de Beautor

Abstract

The necessity to improve the corrosion resistance of car bodies has inclined car manufacturers to use zinc coated steel sheets. In this field electrozinc coated material offer better surface, formability, weldability and paintability. Recently, in order to improve corrosion resistance and paint adhesion metallic coatings such as zinc-nickel and zinc-iron alloys have been developped.

Acierie et Laminoirs de Beautor (02800 La Fère - France) are delivering one or two sides coatings (either pure zinc or zinc-nickel or zinc-iron alloys) deposited on the radial cell electroplating line (using U.S.S. patent). Due to the process the chemical composition and the thickness of the coating are very regular.

The performance regarding corrosion resistance has been enlighted by the « 3C » corrosion test (corrosion by climatic changes).

Welding and galling tests have been performed by the C.R.M. in Liège (Belgium) and they have shown new advantages over the « classical » (pure Zinc) coatings.