This work investigates aqueous corrosion scenarios of industrial interest which induce hydrogen permeation through steel at 20-25 °C, and which are therefore amenable to hydrogen flux monitoring of steel corrosion at ambient temperatures. Initially, it was established that hydrogen flux exiting steel as a result of corrosion induced steady state hydrogen entry at the opposing surface was increased some by removal of air-formed thick oxide films, mitigated by the in-filling of hydrogen traps produced thereby. This informed the development of a procedure for sequentially exposing one face to corrosion for 10 minutes, followed by rapid subsequent measurement of efflux from that same surface. By means of this procedure we were able to rapidly ascertain that highly concentrated H2SO4 and HClO4 induce substantial hydrogen entry into steel. 48 wt% HF acid initially induces hydrogen flux of some 20% flux generated by sour gas saturated NACE A solution.

Subject
Steel surfaces, Water, Fluxes, Probes, Oxide formation, Grinding, Hydrogen flux, Solutions, Oxide surfaces, Nitrogen, Steel, Surface profile, Hydrogen
Keywords:
flux, permeation, HFA
© 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)
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