Claims
- 1. A method for coating exposed conductive surfaces of a workpiece, comprising the steps of:
- (a) placing in a solution of an electrodepositable polymer resin a workpiece comprising an ink jet printhead, said ink jet printhead comprising:
- (i) a plurality of generally parallel longitudinally extending spaced channels adapted to receive printing fluid;
- (ii) a plurality of conductive surfaces having portions of which are exposed within said plurality of channels thereby forming exposed conductive surfaces;
- (b) attaching said workpiece to a voltage supply wherein said exposed conductive surfaces are made into electrodes; and
- (c) energizing said voltage supply thereby causing said electrodepositable polymer resin in said solution to migrate to at least some of said electrodes to form a passivation coating on the exposed conductive surfaces which serves to isolate them from printing fluid placed in the channels when the printhead is operated.
- 2. A method according to claim 1, further comprising the step of:
- curing said coating by means selected from the group consisting of thermal energy and photochemical radiation.
- 3. A method according to claim 1, wherein prior to coating said exposed conductive surfaces with an electrodepositable polymer resin, said method further comprises the steps of:
- placing the workpiece in an acidic solution;
- attaching the workpiece to a voltage supply wherein said exposed conductive surfaces are made into anodes;
- energizing said voltage supply whereby said exposed conductive surfaces are etched by said acidic solution.
- 4. A method according to claim 1, wherein said voltage supply is connected to said conductive surfaces making said conductive surfaces into cathodes.
- 5. A method according to claim 1, wherein said voltage supply is connected to said conductive surfaces making said conductive surfaces into anodes.
CROSS-REFERENCE TO RELATED APPLICATION
This is a divisional application of U.S. patent application Ser. No. 08/621,680, filed Mar. 26, 1996, now U.S. Pat. No. 5,688,391, entitled "METHOD FOR ELECTRO-DEPOSITION PASSIVATION OF INK JET CHANNELS IN INK JET PRINTHEAD."
US Referenced Citations (22)
Divisions (1)
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Number |
Date |
Country |
Parent |
621680 |
Mar 1996 |
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