無電解PdめっきによるZrおよびZr_3Al_2ゲッターの表面改質

概要

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Hydrogen storage materials lose their effectiveness in the presence of small amounts of impurity gases in hydrogen owing to the formation of oxide and/or carbide layers on the surface of materials. To avoid this impairment, applicability of Pd coating as protective layer was examined. Zr and Zr3Al2 were selected as model substrates and coated with Pd with electroless plating method. The characteristics of the Pd coating were examined with scanning electron microscopy (SEM), electron probe microanalysis (EPMA), x-ray photoelectron spectroscopy (XPS) and thermal desorption spectroscopy (TDS). SEM observations showed that dense and relatively smooth Pd-overlayers could be prepared with this method on combination with vacuum annealing. EPMA and XPS revealed that mutual diffusion of the relevant elements took place above 600℃. As a consequence, the elements of the substrates on the surface. Zr, however, was present as ZrC, whereas, Pd was kept in its pure metallic state. TDS showed that Zr played no important role in absorption and desorption of deuterium and only the Pd-overlayer took part in the ab/desorption processes, indicating that the Pd layer acts as permeation window for hydrogen and can protect the inner substrate from impurity gases.
富山大学の論文