In the refinery industry, there is continuous dialogue over the cause and effects of molecular and ionized hydrogen on the corrosion of metals. This paper focuses on the role of nascent hydrogen, a short-lived, non-ionized, monatomic species at equilibrium with other atomic hydrogen species within various alloys. Nascent hydrogen, a major corrosion contributor, is not well understood and not addressed adequately in many refinery standards. The corrosion mechanisms and mechanical properties of different hydrogen species are discussed including their formation, interaction, and transportation within various steels. Material composition, welding techniques, and operating process design conditions to mitigate harmful effects as well as case histories are also included.

Subject
Steel structures, Hydrogen induced cracking, Hydrogen embrittlement, Steel surfaces, Materials, Iron, Hydrides, Mechanical failure, Steel, Stress oriented hydrogen induced cracking, Hydrophobic interaction chromatography, Sulfide stress cracking, Hydrogen
Keywords:
hydride, hydrogen charging, hydrogen embrittlement, hydrogen induced cracking, hydron, nascent hydrogen, tunneling hydrogen
© 2008 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).
2008
Association for Materials Protection and Performance (AMPP)
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