Amines can be caused to react with carboxylic acids in a typical neutralization reaction to produce salts called amine carboxylates. Significant variation in performance can result from appropriate selection of the amine and acid. Many are water soluble types.

The acid is often derived from petroleum usually as an oxidate. Fatty derived sources are also important. Some applications for water soluble types are metalworking and cleaning. Besides preventing corrosion, a number of other performance requirements must be met. Non-aqueous or emulsifiable types find use in the temporary protection of metal surfaces and for down hole protection in oil wells.

Common methods for determining corrosion protection of amine carboxylates are: 1. The cast iron chip tests IP287/74 and ASTM D4627-86, 2. The Herbert Test (IP125), 3. The Nail Test, 4. The Cast Iron Block Test, and 5. Linear Polarization Resistance (LPR). Determination of the choice of method depends upon how well it correlates with field experience. Modified methods are sometimes used to obtain better correlation.

Subject
Acids, Water, Salts, Chips, Solubility, Amines, Metals, Carboxylates, Corrosion inhibitors, Rust, Cast iron, Corrosion protection, Oil
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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