Overall H2S-amine system corrosion rates are determined by the rate of acid oxidation of iron by dissolved forms of H2S and CO2 in highly buffered basic solutions. Rates of interference with the laydown or removal of the protective layer of iron sulfide corrosion product from the free metal are also part of the equation. These two phenomena are functions of the concentration and form of the oxidizing acid, the solution temperature, the fluid velocity, and the concentration of heat stable salt anions. The effect of solution pH, cation content and different heat stable salt anions on the iron sulfide layer and the transport of iron in solution is examined. Maintenance of low heat stable salt anion content in solution is shown to effectively reduce the corrosion. Comparison is made with other control methods, such as strong base addition. Long term benefits of maintenance of low heat stable salt levels are demonstrated.

Subject
Acids, Anions, Ions, Salts, Corrosion rate, Metal surfaces, Iron sulfides, Iron, Salt solutions, Amines, Heat, Chemical reactions, Conductivity
© 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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