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Effect of γ-radiation on the passive layers of Ti and Ti0.2Pd container-materials for high-level waste disposal by A. Michaelis; S. Kudelka; J.W. Schultze is a Engineering article available to read on EtoBox.

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Ti and its alloy TiO.ZPd are considered as promising materials for the manufacture of highlevel nuclear waste (HLW) containers which could act as an engineered barrier in a rock salt repository. Despite their extremely high resistance to general corrosion in salt brines, localized corrosion might be critical. In the present work, pitting in hot q-brine as well as the effect of y-radiation on the passive layers were investigated. The y-photoeffect was simulated by uv-laser irradiation. All measurements were carried out on single Ti grains of known orientation to allow for a correlation of layer properties with the substrate texture. Without radiation, pitting occurred only at potentials much higher than the free corrosion potentials, ie no pitting on any grain orientation has to be expected under conditions relevant for HLW disposal. Furthermore, uv-laser ilumination of the sample surface in q-brine did not result in photo-induced pitting. On the contrary, a laser-induced oxide growth took place and even these layers were stable to corrosion. Anisotropy Micro-Ellipsometry (AME) experiments revealed a photo-induced formation of a two-layer system. The initial anodic layers which were

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Author

A. Michaelis; S. Kudelka; J.W. Schultze

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

1998

Language

EN

Field

Engineering (Physical Sciences)