Thermoplastic resin-coated aluminum alloy plate and process...

B - Operations – Transporting – 32 – B

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B32B 15/08 (2006.01) B05D 7/14 (2006.01) C25D 11/06 (2006.01) C25D 11/16 (2006.01) C25D 11/18 (2006.01) B05D 3/10 (2006.01)

Patent

CA 2250136

A thermoplastic resin-coated aluminum alloy plate having so high a processing adhesion that the laminated thermoplastic resin layer is not separated therefrom even when the plate is subjected to a severe forming process in which the plate is deep-drawn, stretched and then ironed. A process and an apparatus for producing the same are also disclosed. An aluminum alloy plate is treated with an alkali solution and an acid solution in order so as to put the surface of the plate in a special condition. The resultant plate is subjected to anodic electrolysis using a direct current in an acid solution containing one or more of inorganic acid, such as sulfuric acid and an organic acid, such as carboxylic acid or hydroxy carboxylic acid. Alternatively, the resultant plate is subjected to a treatment using hot water of above 60°C, boiling water, or water vapor so as to form a uniform hydration oxide film of 2-10 mm in thickness. The alloy plate is coated with a thermoplastic resin. This enables the thermoplastic resin-coated aluminum alloy plate to have so high a processing adhesion that permits the plate to withstand a severe forming process.

L'invention concerne une plaque d'alliage d'aluminium revêtue de résine thermoplastique et dont l'adhérence par traitement est si forte que la couche de résine thermoplastique laminée ne se détache pas même si la plaque est soumise à un procédé de formage sévère au cours duquel elle subit un emboutissage profond, puis est étirée. L'invention concerne également un procédé et un appareil de production de cette plaque. Le procédé consiste à traiter la plaque d'alliage d'aluminium avec une solution alcaline et une solution acide de façon à conférer à sa surface un état spécifique. On soumet la plaque obtenue à une électrolyse anodique en faisant passer un courant continu dans une solution acide contenant au moins un acide tel que l'acide carboxylique, et un acide organique tel que l'acide carboxylique ou l'acide hydroxy carboxylique. Selon une autre variante, on soumet la plaque obtenue à un traitement à l'eau chaude dépassant les 60 DEG C, à l'eau bouillante ou à la vapeur d'eau de façon à obtenir une pellicule d'oxyde hydratée uniforme dont l'épaisseur est comprise entre 2 et 10 nm. La plaque d'alliage est revêtue d'une résine thermoplastique, Ce qui lui confère une forte adhérence par traitement et lui permet de supporter un processus de formage sévère.

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