Treating an autodeposited coating with an alkaline material
AssigneeHenkel Corporation
InventorsBashire M. Ahmed, Ronald W. Broadbent
Life of this patent
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Abstract
Properties of cured autodeposited coatings are improved by contacting the uncured form of the autodeposited coating with an alkaline material, for example, with an aqueous solution of ammonium bicarbonate, or a hydroxide of an alkali metal or ammonia.
Claims39
In a process for forming an autodeposited coating on a metallic surface in which an uncured form of the coating is formed by contacting the metallic surface with an autodepositing composition until the coating is formed, and thereafter contact between the coated surface and the autodepositing composition is terminated, the improvement comprising thereafter contacting the uncured form of said coating with an alkaline material and thereafter curing the thus treated coating.
In a process wherein an uncured autodeposited coating is formed on a metallic surface by contacting the surface with an autodepositing composition and thereafter withdrawing the coated surface from contact with said composition, and wherein said uncured autodeposited coating includes transient iron, the improvement comprising contacting said uncured coating after said withdrawal with a material which fixes said transient iron in said coating, and thereafter curing said coating containing said fixed transient iron.
A cured autodeposited coating adhered to a metallic substrate having transient iron fixed therein with an alkaline material.
In a process for forming an autodeposited coating on a tin-plated or ferriferous surface on which the cured form of the coating tends to bond poorly, and in which an uncured form of the coating is formed on said surface and thereafter cured, the improvement comprising improving the bond of the cured form of said coating to said surface by applying to the uncured coating an alkaline material, maintaining said alkaline material on said uncured coating by refraining from treating the uncured coating in a manner such that said alkaline material would be removed or rendered ineffective, and thereafter curing the uncured coating.
In a process for forming an autodeposited coating on a metallic surface in which an uncured form of the coating is formed by contacting the metallic surface with an autodepositing composition until the coating is formed, and thereafter contact between the coated surface and the autodepositing composition is terminated, the improvement consisting essentially of thereafter contacting the uncured form of said coating with an alkaline material and thereafter curing the thus treated coating.
Dependencies are inferred from the claim text.