The effect of noble metal addition on the polarization behavior of hydrogen (H2) oxidation and oxygen (O2) reduction on 304 stainless steel (SS) in high temperature, high purity water was studied. It is evident that the incorporation of small amounts of noble metals dramatically improves the hydrogen oxidation kinetics and thus enhances the catalytic recombination efficiency of H2 to O2 to form H2O. The enhancement in the catalytic nature on 304 SS surface doped with noble metals results in a thermodynamically lowest electrochemical corrosion potential (ECP) value (<-500 mVshe) when a stoichiometric or higher amount of hydrogen is present in the water.

Subject
Water, Hydrogen concentration, Metal surfaces, Noble metals, Oxidation behavior, Oxide surfaces, Oxygen, Risk reduction, Polarization, Electrodes, Hydrogen, Oxidation, High temperature
Keywords:
electrochemical polarization, oxygen, hydrogen, 304 Ss, noble metal, high temperature water, ECP, BWR
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.