The results of an electrochemical study performed on duplex, superduplex, austenitic and superaustenitic stainless steel in halide containing sulfuric media are presented and compared. In particular, the specific role of chloride and fluoride ions on both localized and uniform corrosion was investigated. From these results, the use of the duplex stainless steels family in the chemical industry, flue gas desulphurization process and hydrometallurgy is discussed.

Subject
Materials, Fluorides, Corrosion rate, Sulfuric acid, Free corrosion potential, Acidity, Crevices, Sodium chloride solution, Pitting, Corrosion resistance, Stainless steel, Chlorides, Corrosion potential
Keywords:
duplex, superduplex, austenitic, 6Mo stainless steels, fluoride, chloride, sulfuric acid, uniform corrosion, pitting corrosion, potential – pH diagram
© 2006 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).
2006
Association for Materials Protection and Performance (AMPP)
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