A study was made of the mechanisms by which solutions of ammonium EDTA and ammonium citrate remove copper from carbon steel in simulated chemical cleaning environments. Copper removal tests were conducted in a number of simulated environments and DC polarography was used to study the metal chelates. From these studies, we conclude that ferric EDTA is the major copper oxidant when EDTA is the solvent, but the external oxidant (air, NaNO2) removes the copper when ammonium citrate is used. Rates for copper removal are highest when ferric EDTA is the oxidant compared to the other solutions evaluated.

Subject
Acids, Chelation, Iron, Waves, Aqueous solutions, Ammonium, Acidity, Oxidants, Metals, Potassium chloride, Copper, Risk reduction, Oxidation
© 1983 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).
1983
Association for Materials Protection and Performance (AMPP)
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