Coated metallic article
View Patent ↗A method for coating of a metallic article is provided. According to the method, the metal surface is coated with a composition which comprises a polymer or comprises a two-component system that reacts to form a polymer following application to the metal surface. The composition comprises 70-2700 meq/kg olefinic double bonds which leads to stronger adhesion and to increased corrosion resistance.
1. A metallic article, comprising:
a surface; and
a coating applied to the surface,
wherein
the coating comprises at least one component having an olefinic double bond selected from the group consisting of:
a polyamide which comprises polymerized ethylenically unsaturated dicarboxylic monomer units, a polyurethane which comprises polymerized ethylenically unsaturated dicarboxylic monomer units, and
an unsaturated compound having a number average molecular weight (M n ) of 38,000 g/mol or less as determined by vapour pressure osmometry selected from the group consisting of a polyalkenylene, an ester of an unsaturated carboxylic acid, and an ester of an unsaturated alcohol, and
a content of olefinic double bonds in the coating is from 70-2700 meq/kg of the coating.
2. The metallic article according to claim 1 ,
wherein the at least one component having an olefinic double bond is the polyamide which comprises polymerized ethylenically unsaturated dicarboxylic monomer units and the polyamide comprises the 70-2700 meq/kg olefinic double bonds.
3. The metallic article according to claim 1 ,
wherein the at least one component having an olefinic double bond is the unsaturated compound which comprises olefinic double bonds, and
the unsaturated compound comprises the 70-2700 meq/kg olefinic double bonds.
4. The metallic article according to claim 1 , wherein the at least one component having an olefinic double bond is the polyurethane which comprises polymerize ethylenically unsaturated dicarboxylic monomer units and the polyurethane comprises the 70-2700 meq/kg olefinic double bonds.
5. The metallic article according to claim 1 which is a corrosion protected part of a motor vehicle or of a machine.
6. The metallic article according to claim 1 which is a corrosion protected transport line, a corrosion protected distribution line, a corrosion protected mains connection line, a corrosion protected supply or a corrosion protected disposal line.
7. The metallic article according to claim 1 , which is a corrosion protected steel construction component for an offshore construction, or a corrosion protected construction component of a ship or boat.