Method for electro-deposition passivation of ink channels in ink jet printhead

A method for coating exposed conductive surfaces of a workpiece, comprising the steps of:

• placing in a solution of an electrodepositable polymer resin a workpiece comprising an ink jet printhead, said ink jet printhead comprising:
• a base section formed from a piezoelectric material, said base section having a plurality of generally parallel spaced projections extending longitudinally along said base section, each of said projections having a top side;
• first conductive surfaces mounted on said top side of each said base section projection;
• a plurality of intermediate sections mounted on said first conductive surfaces, each intermediate section having a top side and a bottom side and being formed from a piezoelectric material;
• second conductive surfaces mounted on said top side of each said intermediate section;
• and
• a top section mounted on said second conductive surfaces, wherein portions of said first conductive surfaces between said base section projections and said intermediate sections, and of said second conductive surfaces between said intermediate sections and said top section remain exposed thereby forming exposed conductive surfaces;
• attaching said workpiece to a voltage supply wherein said exposed conductive surfaces are made into electrodes;
• 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 coating.