Analysis of recently reported observations of corrosion of carbon steel by CO2 in pipes, impinging jets and rotating cylinders illustrates the importance of distinguishing between momentum and mass transport. Apparent inconsistencies in the data can be explained. Increasing flow rates can cause increases in momentum, heat and mass transfer. In the case of corrosion of carbon steel by CO2, increases in the corrosion rate have been observed. This paper addresses the question, ”Which physical effect (wall shear stress or mass transfer) plays a prominent role in raising the corrosion rate?“ Experiments in pipe, impinging jet, and rotating cylinder flows are analyzed. Although all of these systems have well defined momentum and mass transport rates, the rates differ from each other for each system. Careful analysis of mass transport in the entry region supports the interpretation that the increase in corrosion rate with flow is related to mass transfer, and not local shear stress.

Subject
Pipe surfaces, Piping, Cylinders, Viscosity, Geometry, Corrosion rate, Walls, Wall shear stress, Momentum, Reynolds number, Mass transfer, Shear, Mass transfer coefficient
Keywords:
CO2 corrosion, mass transport, momentum transport, rotating cylinder, impinging jet, pipe flow, corrosion mechanism
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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