Different mechano-chemical mechanisms account for the deterioration of materials under the action of flow. The appearance of power laws of the form CR=const·ua in specific ranges of flow velocity u is typical for corrosion/erosion systems; changes in the exponent 'a' indicating mechanistic alterations. On the basis of this concept phenomena such as mass transfer determined corrosion, erosion corrosion, liquid and solid impingement erosion and cavitation erosion are discussed. The occurrence of critical flow conditions in phase transfer determined corrosion is ascribed to changes in flow pattern leading to dispersion inversion, stratification or impingement of flowing mixtures. Emphasis is put on phase combinations of practical relevance. Most of the analysis is based on observations in the oil and gas industry but the majority of the considerations will equally apply to other practical situations where flow induced metal degradation occurs.

Subject
Materials, Piping, Droplets, Corrosion rate, Flow velocity, Walls, Roughness, Corrosion reactions, Liquids, Corrosion products, Mass transfer, Corrosion scales, Erosion
Keywords:
flow, erosion, erosion-corrosion, velocity, scale, porosity, multi-phase flow, mass transfer, phase transfer
© 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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