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Corrosion Protection of Electrodes by Electrical Biasing

IP.com Disclosure Number: IPCOM000047453D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Crooks, W: AUTHOR [+5]

Abstract

A method is described for the prevention of corrosive attack of the electrodes in an ink jet drop-on-demand print head due to exposure to the ink. The method comprises biasing the ground electrode, which is in contact with the ink, with a negative voltage which exceeds the ionization potential of the electrode material. The usual electrode materials are nickel and gold. The gold is used to protect the nickel from corrosive attack by the ink. Should there be pinholes in the gold film, attack of the nickel takes place through the pin holes. The attack is an oxidation process, but by placing a bias of about -0.36 volt between the electrode and the ink, oxidation of the nickel is prevented.

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Corrosion Protection of Electrodes by Electrical Biasing

A method is described for the prevention of corrosive attack of the electrodes in an ink jet drop-on-demand print head due to exposure to the ink. The method comprises biasing the ground electrode, which is in contact with the ink, with a negative voltage which exceeds the ionization potential of the electrode material. The usual electrode materials are nickel and gold. The gold is used to protect the nickel from corrosive attack by the ink. Should there be pinholes in the gold film, attack of the nickel takes place through the pin holes. The attack is an oxidation process, but by placing a bias of about -0.36 volt between the electrode and the ink, oxidation of the nickel is prevented.

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