This paper describes a model for the simulation of environmental changes within a stress corrosion crack under anaerobic conditions in a near neutral pH, carbon dioxide rich solution. Model simulations predict that a mildly acidic solution is produced after only 0.1 hours of exposure to the test solution. This pH decrease is primarily due to the formation of FeCO3 which alters the carbonate bicarbonate equilibrium, causing a lowering of pH. Once the concentrations of the carbonate species have been reduced in the crack, the exterior surface system can be considered to be in a differential carbonation system with the initial crack.

Subject
External surfaces, Electrochemical cells, Modeling, Corrosion currents, Corrosion rate, Bulk solution, Corrosion cracking, Acidity, Corrosion modeling, Carbonate cracking, Carbonate stress corrosion cracking, Cracks, Stress corrosion cracking
Keywords:
Stress corrosion cracking, anaerobic, CO2-based environment, numerical simulation
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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