Process for treating a conductive surface and products formed thereby
AssigneeElisha Holding LLC
InventorsRobert L. Heimann, Branko Popov, Bruce flint, Nancy G. Heimann, Ravi Chandran, William M. Dalton
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Abstract
The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an electrolytic process to deposit a silicate containing coating or film upon a metallic or conductive surface.
Claims19
A method for treating a substrate having an electrically conductive surface comprising:
- contacting at least a portion of the surface with a medium comprising at least one silicate and having a basic pH and wherein said medium is substantially free of chromates,
- introducing a current to said medium wherein said surface is employed as a cathode;
- drying the substrate,
- rinsing the substrate,
- drying the substrate.
An aqueous medium for use in electrically treating a conductive surface comprising a combination comprising at least one polar carrier, at least one silicate soluble within said carrier, colloidal silica, at least one dopant and wherein the medium has a basic pH and is substantially free of chromates.
A method for treating a metallic or an electrically conductive surface comprising:
- exposing at least a portion of the surface to a medium comprising a combination comprising at least one polar carrier and at least one silicate that is soluble within said carrier wherein said medium has a basic pH,
- introducing an energy source into said first medium thereby treating the surface;
- drying the surface,
- rinsing the surface,
- drying the surface;
- and
- contacting the treated surface with at least one composition that adheres to the treated surface.
An article comprising an electrically conductive substrate comprising zinc wherein at least a portion of which has an inorganic and chromate free surface and at least one composition adhered to said article and wherein said has an ASTM B117 exposure to white rust of greater than 72 hours.
Dependencies are inferred from the claim text.