The effect of noble metal treatment on the 304 stainless steel (SS) oxide formed in high temperature water containing excess hydrogen was examined by the transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The electrochemical corrosion potential (ECP) of noble metal treated 304 SS electrode was also measured to confirm the presence of noble metal on the oxide surface. It was observed that under excess hydrogen water chemistry condition, the presence of Pt and Rh on the oxide surface promotes the transformation of α-Fe2O3 to a spinel Fe3O4 type, a Zn-enriched outer oxide particle and a Cr-enriched inner oxide layer and, thereby, increases the iron concentration in water.

Subject
Water, Oxides, Oxide formation, Oxide layers, Noble metals, Transmission electron microscopy, Metal oxides, Water chemistry, Metallic structures, Oxide surfaces, Zinc oxide, Specimen preparation, Hydrogen
Keywords:
noble metal, 304 SS ECP, high temperature water, oxide, TEM
© 2001 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).
2001
Association for Materials Protection and Performance (AMPP)
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