Acid sulfite pulping of wood chips results in a hot slurry of pulp fibers in spent sulfite liquor. (SSL) when the cooking vessel, or digester, is blown. The pulp must then be separated from and washed free of the SSL. Materials for handling this "red" stock and liquor have traditionally been Types 316L and 317L stainless steel which, in most cases, give satisfactory service. One exception is when chlorides, originating from saltwater floated logs at coastal mills, are present at more than a few hundred mg/ℓ in the SSL. A number of such mills have found it necessary to use titanium or a Ni-Cr-Fe-Mo alloy in critical areas. Another important but less publicized exception occurs when handling SSL which has been chemically degraded, and it is this latter problem to which this paper addresses itself.

Subject
Acids, Steel surfaces, Decomposition, Composition, Liquor, Sulfites, Acidity, Corrosion attacks, Pitting, Stainless steel, Polarization, Chlorides, Electrodes
© 1978 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).
1978
Association for Materials Protection and Performance (AMPP)
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