To increase the knowledge on synergistic and antagonistic interactions between inhibitors (fatty amines, imidazolines, carboxamide ethoxylates) and surfactants (nonionics, quats) systematic investigations were performed under sweet gas production conditions (NaCl/CaCl2-brine, 0.5 MPa CO2, 80 to 130°C, 'rotating cage': 4 m/s) with low alloy steel samples exhibiting three different microstructures (J 55, C 75, C 90) and finely ground or atmospherically rusted surface. It was proved for highly turbulent conditions that surfactants can affect the performance of CO2 corrosion inhibitors significantly, depending on the class of inhibitors, the class of surfactants, the microstructure of the steel and the temperature. Nonionics inhibit quenched-and-tempered steel, but stimulate corrosion of J 55. They impair the efficiency of amine inhibitors. Amine/quat combinations show synergistic effects. The inhibitor/surfactants interaction was investigated by different surface analysis techniques (XPS, LAMMA, TOF-SIMS).

Subject
Steel surfaces, Inhibitor performance, Corrosion rate, Microstructure, Additives, Carbonate scales, Imidazolines, Surfactants, Chemical inhibition, Amines, Corrosion inhibitors, Steel, Corrosion coupons
Keywords:
carbon dioxide, corrosion, low alloy steel, microstructure, inhibitors, surfactants, quaternary ammonium compounds, amines, imidazolines, nonionics
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.