The concept of polarization resistance is introduced, considering a real current-voltage characteristic of the electrochemical system. Then some mathematical methods are discussed, which allow its evaluation. The methods considered are linear interpolation, approximation in mean of a function, operative definition, the INTER1 program, the global and finite difference methods. For each method, except the last, an example of application to a particular electrochemical system is given. The results obtained clearly show the advantage of numerical elaboration, considered as an approximate calculation of the first derivative of the current-voltage characteristic, over the old method based on the graphic analysis of the shape of the polarization curve round the mixed potential of the electrochemical system.

Subject
Inhibitor performance, Corrosion currents, Corrosion rate, Ohmic drop, Derivatives, Iron, Density, Polarization curves, Experimental data, Current densities, Metals, Mixed potential, Polarization resistance
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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