Long term corrosion performance is one of the important considerations in designing nuclear waste isolation packages. Prediction of long term performance based solely on experimental results is difficult because of the lack of data for the time period necessary for nuclear waste isolation. An approach using experiments assisted by analyses is clearly the best available approach. For the analyses of galvanic corrosion, pitting and crevice corrosion, which have been identified as possible corrosion processes for nuclear waste isolation, a finite element method has been developed for the prediction of corrosion rates. The method uses a finite element mesh to model the corrosive environment and the polarization curves of metals are assigned as the boundary conditions to calculate the corrosion cell current distribution. A subroutine is used to calculate the chemical change with time in the crevice or the pit environments. In this paper, the finite element method is described along with experimental confirmation.

Subject
Electric current, Materials, Fluxes, Modeling, Diffusion, Corrosion cells, Nuclear waste, Ion concentrations, Metals, Hydrolysis, Localized corrosion, Elements, Electrochemical potential
© 1984 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1984
Association for Materials Protection and Performance (AMPP)
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