Contributions to ennoblement by various factors were studied on platinum and S44660 stainless alloy. Thermodynamics was found to be the major contributor for platinum whereas cathodic kinetics also contributes to ennoblement of S44660 stainless alloy. Cyclic voltammetry indicates the controlling oxidation-reduction couple for ennoblement involves oxygen in some form (oxygen and peroxide). Passive current density was found to vary little between bare and biofilmed coupons for both S44660 stainless alloy and platinum. This implied that the contribution to ennoblement by passive current density shift is insignificant on platinum and S44660 stainless alloy as used in this study.

Subject
Thermodynamics, Stainless alloys, Passive current, Metal coupons, Peroxide, Seawater, Platinum, Biofilms, Ennoblement, Oxygen, Risk reduction, Electrodes, Exchange current density
Keywords:
Ennoblement, thermodynamics, kinetics, exchange-current, Tafel-slope, passive-current, seawater, biofilms, alloy S44660, platinum
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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