Alloy 22 (N06022) is the current candidate alloy to fabricate the external container of the high level nuclear waste containers for the Yucca Mountain repository. It was of interest to study and compare the general and localized corrosion susceptibility of Alloy 22 in saturated NaF solutions (~ 1 M NaF) at 90°C. Standard electrochemical tests such as cyclic potentiodynamic polarization, amperometry, potentiometry, and electrochemical impedance spectroscopy were used. Studied variables included the solution pH and the alloy microstructure (thermal aging). Results show that Alloy 22 is highly resistant to general and localized corrosion in pure fluoride solutions. Thermal aging is not detrimental and even seems to be slightly beneficial for general corrosion in alkaline solutions.

Subject
Transpassivation, Corrosion rate, Microstructure, Nickel based alloys, Passive current, Molybdenum alloys, Free corrosion potential, Experimental data, Bubbling, Immersion, Corrosion resistance, Alloys, Corrosion potential
Keywords:
N06022, fluoride, pitting corrosion, crevice corrosion, transpassivity, thermal aging, cyclic polarization, electrochemical impedance spectroscopy, corrosion rate, nuclear waste disposal
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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