This paper describes an approach for achieving low corrosion potentials on structural materials exposed to high temperature water, even without the addition or presence of reducing species like H2. This approach employs highly insulating coatings, e.g. yttria stabilized zirconia (YSZ) on structural materials to greatly restrict O2 transport rate to the metal surface while simultaneously preventing the formation of a differential aeration crevice cell because of its highly insulating character. Initial experimental data on 304 stainless steel (SS) coated by air plasma spray show that the corrosion potential of YSZ coated 304 SS remained at ≈ -0.5 Vshe in 288°C water containing up to 200 ppb O2 and no H2.

Subject
Water, Coatings, Boiling water reactors, Hydrogen concentration, Metal surfaces, Zirconium, Oxide surfaces, Oxidants, Oxygen, Electrodes, Corrosion potential, Stress corrosion cracking, Hydrogen
Keywords:
Corrosion potential, insulated coatings, boiling water reactor, yttria stablized zirconia, high temperature water, plasma spray
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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