The scratching electrode technique has been used to study the electrochemical response of a rotating cylindrical electrode with a Vickers diamond stylus whose impacting load was measured with a force transducer. The transient current response of Fe-16wt% Cr-11wt% Ni alloy immersed in a 0.01 M H2SO4-0.01 M KCl solution was measured. The investigation is of fundamental importance to the corrosive wear susceptibility of alloys. The charge density from the scratch surface increased with increasing scribing load. The effect of scribing load, double layer charging, and the ohmic potential drop on the transient response was analyzed. A total depassivated area which includes the scar area and the plastically, deformed surrounding area was acquired by applying Hill's analysis for microindentation. The calculated charge density incorporating the total depassivated area is slightly less than the charge density of the scar as expected.

Subject
Double layer, Electric current, Materials, Indentation, Metal surfaces, Nickel based alloys, Repassivation potentials, Density, Electrochemical current, Oxide surfaces, Plastics, Electrodes, Electrode potential
Keywords:
corrosion, wear, scratching electrode, load
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.