Hydrogen Induced Stress Cracking is a well known failure mechanism for high strength materials that are cathodically protected. Recently there are reports on failures on supermartensitic and duplex stainless steels. Based on the general good field experience with these materials, it is necessary to focus on utilisation and the local design. Allowable strain and stress should be defined and special components should be given more attention in the design stage.

The results from charging experiments show that there is an effect of the hydrostatic pressure and the electrolyte. Results from uniaxial tensile and four point bend testing are presented.

When defining a test method for qualification testing related to Hydrogen Induced Stress Cracking from cathodic protection, it is necessary to address charging conditions, local stresses and dynamic behaviour to simulate real life conditions. There is probably no single test method that can be used for all materials and test conditions. Presently there is no practical standard or guideline that can be used as basis for such testing.

Subject
Test methods, Materials, Cathodic protection, Hydrogen content, Geometry, Stress cracking, Hydrogen charging, Ambient barometric pressure, Stress, Sodium chloride solution, Mechanical failure, Residual stress, Hydrogen
Keywords:
hydrogen embrittlement, cathodic protection, testing methods
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.