Low carbon steel (LCS) exposed to concentrated solutions of urea-ammonium nitrate (UAN) can develop either a fully or a partially passive film. The integrity of the film phase that develops depends primarily on pH and, to a lesser extent, on nitrate ion concentration. Urea interacts synergistically with nitrate in the presence of low-carbon steel; surface adsorption may be the mechanism leading to higher true current densities. Based on this information, an inhibitor was developed that protects the naturally formed passive film from pH depressions.

Subject
Films, Inhibitor performance, Corrosion rate, Passive films, Cathodic current, Free corrosion potential, Nitrates, Current densities, Sodium, Film formation, Corrosion inhibitors, Risk reduction, Electrode potential
© 1988 Betz Laboratories Inc. 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 prior written permission. 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).
1988
Betz Laboratories Inc
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