Influence of surface state on hydrogen sorption by zirconium alloy Zr1Nb

Abstract

This work is focused on the investigation of hydrogen sorption behavior by zirconium alloy Zr1Nb with different surface states. Zirconium alloy samples in initial state, after ion cleaning with subsequent nickel deposition and after treatment by Low Energy High Current Pulsed Electron Beam (LEHCPEB) were hydrogenated at constant pressure and different temperatures. Hydrogen sorption rates as well as the energy of hydrogen adsorption by zirconium alloy with different surface states have been evaluated. It was shown, that ion cleaning with subsequent nickel deposition leads to the hydrogen sorption rate increasing at temperatures 350 – 550 °C, while the energy of hydrogen adsorption by zirconium alloy reduces on 15%. Modification by LEHCPEB leads to the hydrogen sorption rate decreasing at temperatures 350 – 550 °C, while the energy of hydrogen adsorption by zirconium alloy grows on 15%

Hydrogen Sorption Kinetics of SiC-Coated Zr-1Nb Alloy

“…The linear dependencies in Figure 4 indicate that the hydrogen sorption kinetics of uncoated and SiC-coated alloys meets the Arrhenius law. Hydrogen sorption rate of asreceived Zr-1Nb alloy in the indicated temperature range is several times lower than the values obtained in [22]. The lower hydrogen sorption rate by the uncoated alloy is attributed to the formation of ZrO2 barrier layer, which prevents hydrogen penetration [23].…”