Improvement in the production of a zinc-aluminum alloy...

C - Chemistry – Metallurgy – 23 – C

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C23C 2/04 (2006.01) C23C 2/02 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2415326

A process for non-continuous galvanization of a metal object with a Zn-Al alloy including the steps of pre-coating the object with a metallic layer of sufficient thickness to protect the object from oxidation and yet sufficiently thin to permit the pre-coating to substantially completely react with or dissolve in the molten Zn-Al bath, subjecting the precoated object to a surface activation treatment by immersing it in hydrochloric acid and thereafter allowing the surface to dry with a protective coating of a chloride salt, and thereafter immersing the object in the Zn-Al bath.

L'invention concerne un procédé destiné à la galvanisation non continue d'un objet métallique au moyen d'un alliage de Zn-Al, comprenant les étapes consistant à pré-revêtir l'objet avec une couche métallique d'une épaisseur suffisante pour protéger l'objet de l'oxydation tout en étant suffisamment mince pour permettre au pré-revêtement de réagir quasi totalement avec le bain de Zn-Al en fusion ou de se dissoudre dans celui-ci, à soumettre l'objet pré-revêtu à un traitement d'activation de surface par immersion de celui-ci dans un acide hydrochlorique, puis à permettre à la surface de sécher avec un revêtement de protection d'un sel de chlorure et finalement à immerger l'objet dans le bain de Zn-Al.

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