Surface characterization of inhibitor films has been attempted on a variety of metal samples from both laboratory and operating plants. These were evaluated to determine regions of molybdate and zinc accumulation relative to anodic and cathodic areas. The presence of molybdate in pits is shown to follow anticipated patterns over a range of concentrations. It was also shown that a zinc specific chelant modifies the morphology of the corrosion inhibitor film. This film was shown to be a more effective barrier and resulted in lower corrosion rates.

Subject
Pits, Scanning electron microscopy, Steel surfaces, Corrosion rate, Metal surfaces, Inhibitor films, Tubes, Microprobes, Corrosion inhibitors, Steel, Pitting, Deposit corrosion, Zinc
Keywords:
pitting inhibitor, molybdate, zinc chelant
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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