Patent ID: 9023431
Filing Date: 2015-05-05
Classification: B05D,B60B,C23C

Abstract:
1. A method for coating light alloy rims with at least four layers comprising a first primer layer (A1), a second primer layer (A2), a base coat layer (B), and a clear coat layer (C), each layer being of different coating materials, the method comprising providing a substrate comprising a machined light alloy rim blank comprising a cast aluminum alloy; applying the first primer layer (A1) directly to the substrate, the first primer layer (A1) comprising at least one radiation-curable coating material having an acid number in accordance with DIN EN ISO 3682 (by potentiometry) of 10 to 120 mg KOH/g; applying the second primer layer (A2); applying the base coat layer (B); applying the clear coat layer (C) to the machined light alloy rim blank, the dear coat layer (C) comprising a radiation-curable clear coat layer having at least 1 mol of free-radically polymerizabie double-bond reactive groups per kg of coating material; and curing the layers of different coating materials by radiation.