GE Water & Process Technologies (GE) developed a new organic based mild steel corrosion inhibitor for use in closed recirculating cooling systems to effectively replace benchmark Molybdate / Nitrite treatments. Laboratory data comparing the corrosion inhibition obtained with the new product, with the benchmark, and with other organic mild steel inhibitors used for closed cooling loops are presented. The corrosion inhibition efficacy in the laboratory was established by standard electrochemical tests, linear polarization, and under heat transfer conditions with an apparatus that simulates a closed loop recirculating system. In the apparatus corrosion is monitored by: coupon weight loss measurement, corrosion rate meters, and the visual appearance of a heat exchanger tube.

Hypothetical mechanisms by which the new product inhibits corrosion of mild steel are also discussed.

Subject
Water, Iron oxide, Nitrites, Corrosion rate, Tubes, Steel coupons, Corrosion loops, Metal oxides, Heat exchangers, Corrosion inhibitors, Steel, Corrosion coupons, Rest potential
Keywords:
organic corrosion inhibitor, corrosion inhibition, mild steel, neutral to alkaline solution, inhibition mechanisms, closed recirculating cooling, corrosion products
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
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