Corrosion can be accelerated by fluid flow. An overview is presented of the relationships among mass transfer coefficient, fluid velocity, shear stress, and fluid properties for several geometries. Equations are presented that allow rotating (inner) cylinder electrode velocities to be chosen so that the mass transfer coefficients are equal to those in pipes, concentric annuli, and wall jets. The suggestion is made that equality of shear stress in two configurations may sometimes be used as one criterion to insure that the fluid affected corrosion mechanism in one configuration is duplicated in the other. The second criterion is that the flow regimes must be the same (e.g. turbulent). Results are presented to show how the rotating cylinder electrode might be used as a practical laboratory tool to simulate and predict certain types of velocity sensitive corrosion. This tool can be used in either an electrochemical or in a gravimetric mode to make this prediction.

Subject
Rotating cylinder electrodes, Piping, Geometry, Corrosion rate, Sulfuric acid, Flow velocity, Wall shear stress, Reynolds number, Mass transfer, Shear, Fluids, Mass transfer coefficient, Corrosion mechanisms
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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