Corrosion of carbon steel by alkaline sulfide liquors is a serious problem for pulp mills using kraft pulping processes. Studies have been conducted to characterize corrosion rates for carbon steels exposed to simulated liquors with various concentrations of major and minor species known to be present in kraft liquors. Corrosion rate measurements made by linear polarization methods have been compared with results of concurrent weight loss tests. With the exception of solutions containing high concentrations of polysulfides, linear polarization tests are in good qualitative agreement with weight loss measurements. Oxidation of species in the liquor apparently masquerades as metal dissolution in solutions where the rest potential is raised by oxidizing polysulfides. Some uncertainties remain regarding the origins of the Tafel slope constants and oxidation numbers required for agreement between the linear polarization and weight loss results.

Subject
Corrosion rate, Liquor, Linear polarization, Weight loss, Weight loss analysis, Polysulfides, Carbon steel, Sulfides, Electrodes, Corrosion potential, Rest potential, Electrode potential, Oxidation
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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