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Formation of rare earth hydroxide nanotubes and whiskers as corrosion product of LaNi5-type alloys in aqueous KOH

Published online by Cambridge University Press:  15 March 2000

F. Maurel ,
M. J. Hÿtch ,
B. Knosp  and
M. Backhaus-Ricoult
F. Maurel
Affiliation:
Centre d'Études de Chimie Métallurgique, CNRS, 15 rue G. Urbain, 94407 Vitry-sur-Seine, France
M. J. Hÿtch
Affiliation:
Centre d'Études de Chimie Métallurgique, CNRS, 15 rue G. Urbain, 94407 Vitry-sur-Seine, France
B. Knosp
Affiliation:
SAFT, Direction de la Recherche, route de Nozay, 91460 Marcoussis, France
M. Backhaus-Ricoult*
Affiliation:
Centre d'Études de Chimie Métallurgique, CNRS, 15 rue G. Urbain, 94407 Vitry-sur-Seine, France
*
backhaus@glvt-cnrs.fr
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Abstract

Mm(OH)3 (Mm = mischmetal) single crystalline needles with [001] growth axis form upon exposure of MmNi5-substituted alloys to aqueous KOH. Crystal structure, chemical composition and morphology of the needles are studied by means of scanning electron microscopy and quantitative transmission electron microscopy. The needles can be either solid (whiskers) or hollow (nanotubes). Their morphology and growth kinetics are studied as a function of immersion temperature, stirring rate of the aqueous KOH electrolyte and presence of tracer. Based on the observations, a model mechanism is developed for their growth.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 9 , Issue 3 , March 2000 , pp. 205 - 213
Copyright
© EDP Sciences, 2000

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