Hydrogen transport and embrittlement for palladium coated vanadium-chromium-titanium alloys

[摘要] As part of a study of the thermodynamics, kinetics and embrittlement properties of hydrogen in vanadium based alloys, experiments were conducted to determine the rate of hydrogen transport through the vanadium reference alloys, V-7.5Cr-15Ti and V-4Cr-4Ti, and to determine these alloys' hydrogen embrittlement, they were exposed to hydrogen pressures of 3 and 300 kPa (0.03-3 atm) at temperatures between 380 and 475 degrees C. To facilitate hydrogen entry and egress, tubes of these alloys were coated with palladium on the inside and outside faces. Observed permeabilities were 0.015 to 0.065 mu mol/(m(2) s Pa-0.5) for the V-7.5Cr-15Ti alloy and 0.02 to 0.05 mu mol/(m(2) s Pa-0.5) for the V-4Cr-4Ti alloy depending on the quality of the coat and the operating temperature. At 1.7 atm hydrogen, V-7.5Cr-15Ti embrittled at temperatures below 380 degrees C while V-4Cr-4Ti embrittled around 330 degrees C.

[发布日期] 1996-10-01

[效力级别]  Proceedings Paper