An electrochemical laboratory technique is presented for the evaluation of film persistency under high-speed fluid flow. The experimental system involves a disk electrode immersed in electrolyte and subjected to an axisymmetric impinging jet of the same electrolyte. Ring-electrode experiments were used to determine the value of the hydrodynamic shear and to identify the geometric constraints under which the shear stress on the electrode surface is a linear function of radial position. The geometric constraints obtained were tighter than previously reported results. With the proper experimental design. the critical shear for removal of a protective film can be obtained by measuring the profile of an electrode subjected to a given jet velocity. This technique is illustrated for evaluation of a commercial inhibitor in chloride solutions.

Subject
Coating removal, Stagnation, Corrosion rate, Impingement, Wall shear stress, Hydrodynamics, Stress, Constants, Mass transfer, Shear, Erosion corrosion, Electrodes, Electrolytes
© 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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