caa a22 4500 463224647 CHVBK 20180405153223.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-0649-8 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0649-8 Hydrogen permeation through internally oxidized Pd alloys [Elektronische Daten] [Viviane Azambuja, Dilson S. dos Santos] Hydrogen diffusivity and solubility were determined by electrochemical hydrogen permeation tests in samples of Pd0.97 Al0.03 and Pd0.97 Ce0.03 in the as received and internally oxidized conditions. Internal oxidization caused the appearance of nanosized oxide precipitates in the Pd matrix. The shape and size of precipitates and also the coherence between the precipitates and the matrix were observed by transmission electron microscopy (TEM). Electrochemical hydrogen permeation tests revealed that the presence of oxides increases the apparent hydrogen solubility, S app, but decreases the hydrogen diffusivity, D app. The values of D app were 2.0×10−11m2s−1 for vacuum heat treated Pd0.97 Al0.03 alloy and 4.0×10−12m2s−1 for internally oxidized Pd0.97 Al0.03 alloy. However, the concentration of trapped hydrogen was 49molH.m−3 for the Pd0.97 Al0.03 alloy in the vacuum heat treated condition and 403molH.m−3 for the Pd0.97 Al0.03 alloy in the internally oxidized condition. Both heat treatments were performed at 1073K for 24h. The influence of the nature, size and distribution of the precipitates on the hydrogen permeation parameters are discussed in this paper. Springer Science+Business Media, LLC, 2007 Azambuja Viviane PEMM-COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut dos Santos Dilson S. PEMM-COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2255-2260 0022-2461 42:7<2255 2007 42 10853 https://doi.org/10.1007/s10853-006-0649-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0649-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Azambuja Viviane PEMM-COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- dos Santos Dilson S. PEMM-COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68505, 21941-972, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/7(2007-04-01), 2255-2260 0022-2461 42:7<2255 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer