Magnesium rich coatings and coating systems

Details Magnesium rich coatings and coating systems Magnesium rich coatings and coating systems

B - Operations, Transporting

05

D

B05D 1/36 (2006.01) C08F 283/00 (2006.01)

Patent

CA 2545091

Disclosed are methods of treating a metal to improve the metal's corrosion resistance. The method includes applying, to the surface of the metal, a coating which comprises magnesium powder and a binder. The present invention also relates to a coating composition that includes magnesium powder and a silane modified epoxy isocyanate hybrid polymer or prepolymer. The inventors have found that corrosion resistance (as determined by ProhesionTM exposure in accordance with ASTM D5894-96, which is hereby incorporated by reference) in excess of 3,000 hours on 2024 T-3 aluminum alloy can be achieved with the methods and coating compositions of the present invention.

L'invention concerne des procédés de traitement d'un métal destinés à améliorer la résistance à la corrosion du métal. Le procédé consiste à appliquer sur la surface du métal un revêtement contenant une poudre de magnésium et un liant. La présente invention concerne également une composition de revêtement contenant une poudre de magnésium et un polymère ou prépolymère hybride d'époxy isocyanate modifié par un silane. On obtient une résistance à la corrosion (telle que déterminée par une exposition à Prohesion<SP>TM</SP> selon ASTM D5894-96, cité en référence) dépassant les 3 000 heures sur un alliage d'aluminium 2024 T-3 grâce aux procédés et aux compositions de revêtement de la présente invention.

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