The growth of pits is generally divided into an initiation and a propagation stage. Although a material’s susceptibility towards pitting attack can be evaluated by the size of the hysteresis loop formed in a cyclic polarization test, the rate of pit propagation can not be determined so readily. This paper outlines a simple test to evaluate the rate of pit propagation. A model of pit propagation is proposed and examined using synthesized polarization curves. Electrochemical tests and surface analysis with molybdate and zinc are used to validate the model.

Subject
Pits, Corrosion rate, Pit propagation, Metal surfaces, Passive films, Repassivation potentials, Corrosion inhibitors, Pitting, Zinc, Cathodic inhibitors, Corrosion potential, Breakdown potential, Electrode potential
Keywords:
pitting, molybdate, zinc, organophosphate, modeling, propagation
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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