Two types of corrosion inhibitors are studied in laboratory tests simulating batch and continuous treatment methods. Type I is an inhibitor which is adsorbed on the corrosion product layer and forms an inhibitor film. Type II reacts with the corrosion product layer to form a protective film. With both inhibitors, the protection offered by continuous treatment at 100 to 1000 ppm inhibitor compares favorably with batch treatment using neat or 10% solutions of inhibitor. The results show batch treatment of gas phase and liquid phase coupons with a 50% solution of Type I inhibitor gives optimum protection. The treatment gave 91% protection on the liquid phase coupons and only 70% protection on the gas phase coupons, indicating the gas phase coupons are more difficult to inhibit.

Batch treatment with neat Type II inhibitor gave better protection than treatment with 10% solutions of the inhibitor in methanol, crude oil or resid oil. The Type II inhibitor at 100 ppm in a continuous application gave as much protection as batch treatment with neat or 10% solutions of the inhibitor in solvents.

Subject
Chemical compounds, Inhibitor films, Autoclaves, Steel coupons, Solvents, Weight loss coupons, Liquids, Solutions, Corrosion inhibitors, Crude, Methanol, Hydrocarbons, Oil
Keywords:
corrosion inhibitor, rotating cylinder electrode, continuous treatment, batch treatment, autoclave, CO2 corrosion
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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