Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1996-06-03
1997-12-23
Silverberg, Sam
Coating processes
With post-treatment of coating or coating material
Heating or drying
148243, 148247, 148251, 427409, C23C 2234
Patent
active
057005230
ABSTRACT:
A method for treating a metal surface involves contacting the metal surface with an aqueous silicate solution, contacting the silicate-coated metal surface with an aqueous organo-functional silane solution, and then contacting the silane-coated metal surface with a chrome-free pretreatment. Preferably, the bath containing the aqueous silicate solution also includes a cleaning agent for cleaning the metal surface. Alternatively, the metal surface may be cleaned in a separate step before the metal surface is contacted with the aqueous silicate solution and, optionally, the metal surface is rinsed with water after the metal surface is cleaned and before the metal surface is contacted with the aqueous silicate solution. The silicate-coated metal surface may be rinsed with water before it is contacted with an aqueous organo-functional silane solution. In addition, the silane-coated metal surface may be rinsed with water before it is contacted with a chrome-free pretreatment. As an alternative or in addition to these rinsing steps, excess solution may be removed from the silicate-coated or silane-coated metal surface prior to the subsequent steps. Preferably, the aqueous silicate solution includes water and either sodium silicate or potassium silicate, and the aqueous organo-functional silane solution comprises an aminopropyl silane and water.
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"Powder coat vs. electrocoat evaluated by custom finisher," Article from Modern Metals., (pp. 36, 38, 40).
Petrole Anthony P.
Rivera Jose B.
Bulk Chemicals, Inc.
Silverberg Sam
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