Patent ID: 7947333

Claim:
A method comprising coating a metallic coil or a metallic sheet with an aqueous coating composition by directly applying said aqueous coating on said metallic coil or metallic sheet by at least one method selected from the group consisting of dipping, spraying, rollcoating, electrostatically spraying, dipping and rinsing, dipping and squeezing, spraying and rinsing or spraying and squeezing wherein the aqueous composition comprises water and at least one compound selected from the group consisting of a zirconium compound, a titanium compound, a hafnium compound and combinations thereof to yield a coated metallic coil or metallic sheet; shaping the coated metallic coil or metallic sheet by cold extruding, deep-drawing, drawing, necking, punching, wall ironing, or by a combination thereof, to form a hollow article or a casing; and cleaning and optionally further coating the hollow article or casing to produce a coated hollow article or casing, wherein said further coating is either chemical pre-treatment or chemical treatment, followed by ink, paint or both ink and paint, wherein the metallic coil or metallic sheet comprises aluminum or aluminum alloy.