Patent ID: 8871309
Filing Date: 2014-10-28
Classification: B05D,C01G,C01P,C08K,C09C,C09D,Y10T

Abstract:
1. A method of depositing a white to off-white or gray autodeposition coating on an active metal substrate surface comprising: contacting an active metal substrate surface for 0.5 to 10 minutes, with an autodeposition bath composition to form a white to off-white or gray initially adherent coating on said surface; said autodeposition bath composition comprising: optionally, wherein relative hydrophobicity/hydrophilicity of the non-black solid pigment particles and hydrophobicity/hydrophilicity of the particles of a coating-forming polymeric material are such that the non-black solid pigment particles remain dispersed in the bath in absence of active metal and deposit adherently on the active metal substrate in said contacting step, said composition being effective to chemically attack, in the absence of an external electrical potential, the active metal surface immersed therein to dissolve therefrom metal to release ions of said metal and sufficient to cause said polymeric material and said non-black solid pigment particles to deposit on the active metal surface as the initially adherent coating which increases in weight or thickness the longer the time said surface is immersed in said composition; rinsing said initially adherent coating with a rinse comprising water; optionally, drying said initially adherent coating; and curing said initially adherent coating to form a cured, white to off-white or gray coating.