GALVANIC PROTECTION OF ANTI-CAVITATION LAYER BY AN UNDERLAYER
Original Publication Date: 1994-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
Thermal ink jet devices typically employ a transducer which operates in a hostile environment of an aqueous solution (ink) at elevated temperatures and under high pressure. The ink is normally a mixture of water, glycols, dyes and additional additives. Very often, these conditions encourage the degradation of the interface between the ink and the transducer through a mechanism known as hydrogen embrittlement. Characteristically, failure caused by hydrogen embrittlement is a delayed process, and is due to formation of a brittle path through the lattice of the transducer material with an accumulation of hydrogen. Many materials are susceptible to hydrogen embrittlement, including glass, ceramics and polymers, however, primary practical implications are most widely known with respect to metals.