One of the important uses of corrosion inhibitors in the automotive industry is for the prevention of corrosion in the engine cooling system. Formulated antifreeze products usually contain a combination of inhibitors selected to provide corrosion protection for all of the metals in an engine cooling system. Although many chemicals have been investigated for their inhibitive properties in engine cooling systems containing ethylene glycol and water, only a limited number are actually used in the large number of antifreezes on the market today. Table 1 gives comparative chemical analyses of 21 ethylene glycol antifreezes. Most antifreezes contain several inhibitors, and the general function of each of these inhibitors is shown in Table 2. There is considerable functional overlapping among the inhibitors, a feature that provides a margin of safety in corrosion inhibition.

Subject
Corrosion rate, Metal surfaces, Aluminum, Coolants, Phosphates, Engines, Heat, Corrosion inhibitors, Glycol, Corrosion protection, Aluminum alloys, Test specimen, Surface temperature
© 1973 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).
1973
Association for Materials Protection and Performance (AMPP)
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