C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
C25D 11/08 (2006.01) C09D 183/04 (2006.01) C23G 1/12 (2006.01) C25D 11/16 (2006.01) C25D 11/24 (2006.01)
Patent
CA 2341885
Them is disclosed a method for surface treating aluminum products, especially vehicle wheels, to improve their brightness. The method comprises: (a) applying a chemical brightening composition to these products; (b) deoxidizing the surface of said wheel products in a nitric acid-based bath; (c) forming a porous oxide on that with an electrolytic bath containing phosphoric or phosphonic acid; and (d) applying, preferably spraying, a siloxane-based film to that porous oxide. In many instances, intermediate rinsing substeps are performed between these respective main steps.
Cette invention concerne un procédé de traitement de surface pour articles en aluminium, en particulier pour roues de véhicule, qui est destiné à rehausser l'éclat desdits produits. Ce procédé consiste à: (a) appliquer une composition chimique lustrante sur ces produits; (b) désoxyder la surface desdites roues dans un bain à base d'acide nitrique; (c) déposer un oxyde poreux sur ces roues par un bain électrolytique renfermant de l'acide phosphorique ou phosphonique; et (d) appliquer, de préférence par pulvérisation, un film à base de siloxane sur l'oxyde poreux en question. Bien souvent, on procède à des rinçages intermédiaires entre ces opérations.
Dando Neal R.
Grassi John R.
Holtz Mark A.
Robare Kevin M.
Vega Luis F.
Alcoa Inc.
Smart & Biggar
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