A coating composition for steel product, a coated steel...

C - Chemistry – Metallurgy – 23 – C

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C23C 2/12 (2006.01) C23C 2/26 (2006.01)

Patent

CA 2380891

A method of coating of steel products such as plate and sheet using an aluminum-zinc coating alloy includes modifying the coating bath with a particulate compound constituent in effective amounts to decrease the spangle facet size of the coated product, improve tension bend rust stain performance, and coated product paintability. Constituents include borides such as titanium boride and aluminum borides, carbides such as titanium carbide, and aluminides such as titanium aluminide. The method produces a coated steel product that does not require temper rolling for painting.

L'invention concerne un procédé permettant d'enrober des produits en acier tels que des plaques et des tôles à l'aide d'un alliage d'enrobage à base d'aluminium et de zinc. Ce procédé consiste à modifier le bain d'enrobage à l'aide d'un constituant particulaire en quantités suffisantes pour réduire la taille des facettes de fleurage du produit enrobé et pour améliorer les performances de la courbe de tension de la coloration et la peignabilité du produit enrobé. Les constituants comprennent des borures tels que le borure de titane et le borure d'aluminium; des carbures tels que du carbure de titane; et des aluminures tels que de l'aluminure de titane. Le procédé permet d'obtenir un produit en acier enrobé qui ne nécessite par d'écrouissage à froid pour être peint.

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