Low toxicity and low cost have helped the popularity of calcium chloride brines. The corrosive nature of this brine has traditionally been managed by using chromates. However, the ever increasing environmental restrictions on the use of chromates, have encouraged the development of non-chromate alternatives.

This paper details development of a novel calcium chloride corrosion inhibitor formulation free of chromate and other heavy metals. It also discusses some intermediate formulations which ultimately led to the final formulation. Within the temperature range of -35°C (-30°F) to 82°C (180°F), the inhibitor program is compatible with 0 to 35 wt% (specific gravity 1.00 to 1.35) brine. Its flexible operating pH (6.4-11) eliminates the need for frequent caustic addition. This inhibitor is designed to protect mild steel, copper and, eliminate fouling within the above operating parameters.

Subject
Inhibitor performance, Corrosion rate, Corrosivity, Phosphonates, Corrosion loops, Acidity, Corrosion inhibitors, Steel, Brines, Calcium chloride, Copper, Zinc, Fouling
Keywords:
brine, calcium chloride, corrosion inhibition, chromate, phosphate, molybdate, zinc
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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