The wettability of carbon steel surfaces with aqueous media (distilled water, brines) and hydrocarbon media (crude oils) was studied under CO2 corrosion conditions at 75 and 80°C and 5 bar CO2 with respect to the effect of surface active compounds (inhibitors, demulsifiers) by quasi-insitu and insitu contact angle measurements in a high pressure test cell. Fatty alcohol ethoxylates, quats, amines and imidazolines influence the hydro-philic/hydrophobic properties of carbonate scales on corroding carbon steel, but inhibiting mechanisms cannot be explained by hydrophobing effects alone. The method yields easy and quick information on substance effects, specifically in case of insitu measurements in oil-in-water systems.

Subject
Steel surfaces, Water, Oils, Wettability, Solids, Wetting, Interfacial tension, Liquids, Corrosion products, Metallic surfaces, Interfaces, Corrosion inhibitors, Hydrocarbons
Keywords:
Carbon steel, carbon dioxide, corrosion, brines, hydrocarbons, crude oils, inhibitors, demulsifiers, contact angle measurements, high pressure
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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