TY - RPRT TI - Hydrogen absorption by zirconium alloy cladding tube with surface oxide film AB - Hydrogen absorption kinetics of Zircaloy (2 and 4) and Zr-Nb (1% and 2.5%) cladding tubes were studied by heating in hydrogen gas after oxide film formation in steam, oxygen or air. Hydrogen absorption rate depended on the degree of pre-oxidation. In Zr-Nb, the absorption rate was also sensitive to the atmosphere used for pre-oxidation, whereas in Zircaloy the rate was relatively independent of the kind of oxidant. In all materials, pre-oxidation to the transition point was found to bring about high absorption rate in the subsequent hydriding step. After pre-oxidation to the post-transition region, hydrogen absorption rate by Zircaloy showed constant or slightly decreasing tendency with increasing oxidation level, whereas in Zr-Nb, particularly in Zr-2.5%Nb, the rate showed a clearly decreasing tendency depending on the pre-oxidation atmosphere. Different characteristics of Zircaloy and Zr-Nb can partly be explained in terms of different valencies of alloying elements which influence the lattice defect concentrations in the oxide films. (author). AU - "Uchida, Masaaki [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment]" KW - "36 MATERIALS SCIENCE" KW - "ZIRCONIUM BASE ALLOYS" KW - "HYDROGEN" KW - "CHEMISORPTION" KW - "ADSORPTION" KW - "NIOBIUM ALLOYS" KW - "PIPES" KW - "SURFACE COATING" KW - "OXIDATION" KW - "STEAM" KW - "OXYGEN" KW - "AIR" KW - "OXIDES" KW - "FILMS" KW - "CHEMICAL REACTION KINETICS" KW - "CORROSION RESISTANCE" KW - "HYDRIDATION" KW - "360104" KW - "360105" KW - "PHYSICAL PROPERTIES" KW - "CORROSION AND EROSION" DO - https://doi.org/ UR - PB - CY - Japan PY - 1991 DA - 1991-08-01 LA - English J2 - [] VL - C1 - Japan Atomic Energy Research Inst., Tokyo (Japan) C2 - C3 - JAERI-M-91-132 C4 - C5 - OSTI; NTIS (US Sales Only); INIS L3 - Other Information: PBD: Aug 1991 ER -