Galvanized steel sheet with high press formability and a...

C - Chemistry – Metallurgy – 23 – C

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C23C 2/26 (2006.01) C10M 103/06 (2006.01) C10M 173/02 (2006.01) C23C 22/05 (2006.01)

Patent

CA 2033862

There is provided a galvanized steel sheet with high press formability, which has an inorganic compound on a metallic galvanized layer thereof. The galvanized steel sheet according to the present invention is manufactured by bringing a plating surface of the galvanized steel sheet into contact with a water solution containing 0.1 wt% or more of the organic compound, and then drying the steel sheet by heating within a temperature range of 60 to 400°C. The friction coefficient of the galvanized steel sheet of the invention is 80% or less of the friction coefficient obtained without the inorganic compound on the metallic galvanized layer and the amount of insoluble slimes of the inorganic compound left after water washing or alkali degreasing is less than 1 mg/m2.

Présentation d'une tôle d'acier galvanisé à haute formabilité à la presse comportant un composé organique sur une couche métallique galvanisée. La tôle d'acier galvanisé de la présente invention est fabriquée en mettant en contact une surface de placage de la tôle d'acier galvanisé avec une solution aqueuse renfermant 0,1 % en poids ou plus du composé organique, et en séchant ensuite la tôle en la chauffant à une température de 60 à 400 degrés Celsius. Le coefficient de frottement de la tôle d'acier galvanisé de la présente invention équivaut à 80 % ou moins du coefficient obtenu sans utiliser le composé organique sur la couche métallique galvanisée et la quantité de boues insolubles du composé organique sur la couche métallique galvanisée restante après lavage à l'eau ou dégraissage à la soude est inférieure à 1 mg/m2..

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