Deterioration of metallic materials caused by corrosion such as pitting and cracking in a neutral environment is initially dominated by the formation of localized corrosion conditions based on heterogeneous electrochemical reactions between materials and environments. For example, the cause of delayed fractures of high tension bolts in a neutral environment has been ascribed to hydogen embrittlement, and the hydrogen apparently entered the high tension bolts through localized corrosion. The mechanistic aspects of the hydrogen entry, however, has not been clarified. In order to assess the local pH at corroding surfaces and hydrogen entry process, a new method using hydrogen permeation measurements by electrochemical method at an artificial crevice or under a rust layer has been developed. It was clarified that the above method was useful for local pH measurement particularly under wet and dry conditions.

Subject
Pits, Steel surfaces, Hydrogen permeation, Corrosion rate, Iron, Acidity, Crevices, Surface layers, Steel, Rust, Environments, Localized corrosion, Hydrogen
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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