The ability of an automotive coolant to provide corrosion protection to system components depends on a complex blend of inhibitors. Degradation of these antifreeze inhibitors occurs with time in service and leads to increased corrosivity. A coolant condition sensor has been developed which responds to inhibitor depletion in service and to low coolant level. The electrochemical principles for the sensor and the integrated circuit which make it practical for automotive applications are described . Results of laboratory and vehicle fleet tests which show the response of the sensor to inhibitor degradation are presented.

Subject
Circuits, Sensors, Corrosivity, Aluminum, Coolants, Potential measurements, Phosphates, Sodium, Corrosion inhibitors, Steel, Chlorides, Electrodes, Electrode potential
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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