Patent ID: 8968881
Filing Date: 2015-03-03
Classification: B05D,Y10T

Abstract:
1. A precoated metal sheet produced by multilayer simultaneous coating and superior in workability and corrosion resistance, comprising a lower coat layer and an upper coat layer thereon which are formed on a metal sheet by a multilayer simultaneous coating system, wherein the lower coat layer contains an average 30 wt % or more of a rust preventing pigment, and the upper coat layer contains a rust preventing pigment the same as the rust preventing pigment in the lower coat layer by an average content lower than the average content of the lower coat layer and by a concentration gradient gradually decreasing the further from the vicinity of the interface with the lower coat layer, and the centerline average roughness Ra of the interface between the lower coat layer and upper coat layer is 0.3 to 0.7 μm, wherein the rust preventing pigment is not present at the surface of the upper coat layer.