Electrochemical processes directly related to stress corrosion cracking (SCC) and corrosion fatigue (CF) have been evaluated using electrochemical impedance spectroscopy (EIS) and new methods of mechanical and fatigue admittance which describe the coupling of electrode kinetics to mechanical perturbations. Features in the high-frequency impedance spectra and maxima in the mechanical admittance vs potential behavior define necessary conditons for SCC of C1118 steel in 70°C carbonate/bicarbonate and pH 4 phosphate solutions. The fatigue admittance of Al 7075 in 0.5 N NaCl allows evaluation of the effective open-circuit potential of the crack tip. Results suggest that highly directed dissolution of the crack tip (e.g., dissolution of 10-11 cm3/cycle) enhances fatigue crack growth. These preliminary results suggest new approaches for rapidly characterizing the CF and SCC susceptibility of materials.

Subject
Electric current, Crack growth, Corrosion fatigue, Impedance, Dissolution, Corrosion cracking, Stress cracking, Stress, Constants, Electrochemical current, Steel, Stress corrosion cracking, Electrode potential
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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