Silver-gold alloys, with gold contents from 2.2 up to 60 at.%, are susceptible to stress corrosion cracking (SCC) in 1M KCl, 1M KBr and 1M KI aqueous solutions. Cracks are mainly intergranular, and there is no evidence of a minimum value of gold content, below which no SCC could be observed. According to the surface mobility mechanism, up to 15 at.% gold, the surface mobility of silver, induced by the environment, is the rate controlling step. For higher gold contents, gold surface mobility starts to play an increasing role, and above 60 at.% it becomes rate controlling.

Subject
Metal surfaces, Wiring, Crack propagation, Polarization curves, Current densities, Gold, Electric potential, Potassium chloride, Alloys, Cracks, Corrosion potential, Stress corrosion cracking, Electrode potential
Keywords:
Stress corrosion cracking, chloride, bromide, iodide, surface mobility, silver gold alloys, gold content, electrode potential
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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