The effect of an inert solid deposit on uniform CO2 corrosion of mild steel is modeled based on a mechanistic electrochemical CO2 corrosion model. Laboratory testing has shown that the dominant factors introduced by the inert solids deposit are related to surface coverage, where both anodic and cathodic reaction rates are decreased because of less active surface area being exposed. The inert solid deposits also create a mass transfer barrier for corrosive species which limits the rate of the cathodic reactions. An existing mechanistic electrochemical model was modified to account for these effects and was capable of capturing the main features of uniform CO2 corrosion of mild steel under inert solid deposits.

Subject
Water, Materials, Sand, Corrosion rate, Diffusion, Solids, Porosity, Sodium chloride solution, Anodic reactions, Steel, Deposit corrosion, Risk reduction, Exchange current density
Keywords:
underdeposit, CO2 corrosion, mild steel, model, mass transfer
© 2011 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).
2011
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.