The kraft pulping process uses an alkaline sulfide liquor known as white liquor to dissolve lignin from wood chips in the manufacture of pulp. White liquor is corrosive to carbon steel equipment used in liquor preparation and storage. Thiosulfate ions which are usually present in white liquor accelerate corrosion rates substantially. Coupon tests have been conducted to characterize the effect of thiosulfate on white liquor corrosivity toward carbon steel. Electrochemical tests were conducted to examine the origins of the corrosion acceleration that was observed. Accelerated corrosion was attributed to the occurrence of alternative cathodic reactions involving direct reduction of thiosulfate ions.

Subject
Steel surfaces, Corrosion rate, Liquor, Iron sulfides, Corrosion reactions, Thiosulfate, Gold, Polysulfides, Carbon steel, Risk reduction, Electrodes, Rest potential, Electrode potential
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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