Coated subtrate and process for production thereof

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 11/30 (2006.01) C25D 11/34 (2006.01) C25D 21/12 (2006.01)

Patent

CA 2233339

A process for electrolytically coating a substrate at a preselected second voltage. The process comprises the steps of: (i) immersing the substrate in an aqueous electrolytic bath comprising at least one soluble salt, the substrate acting as a first electrode; (ii) contacting a second electrode with the aqueous electrolytic bath; (iii) passing a current through the aqueous electrolytic bath at a first voltage which is less than the second voltage, the current comprising alternating current superimposed over direct current; (iv) increasing the first voltage to a second voltage over a period of time while continuing to pass the current through the aqueous electrolytic bath; (v) keeping the second voltage substantially constant thereby allowing the current to decrease; and (vi) thereby forming an oxide coating on the substrate.

Procédé de revêtement électrolytique d'un substrat à une deuxième tension choisie à l'avance. Le procédé comprend les étapes suivantes : i) immerger le substrat dans un bain électrolytique aqueux comprenant au moins un sel soluble, le substrat joue alors le rôle de la première électrode; ii) mettre en contact une deuxième électrode avec le bain électrolytique aqueux; iii) faire passer un courant dans le bain électrolytique aqueux à une première tension qui est inférieure à la deuxième tension, le courant comprenant un courant alternatif superposé à un courant continu; iv) augmenter la première tension jusqu'à une deuxième tension sur une période de temps tout en continuant de faire passer le courant par le bain électrolytique aqueux; v) garder essentiellement constante la deuxième tension, afin de permettre au courant de diminuer, et vi) de former ainsi une couche d'oxyde sur le substrat.

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