SYMPOSIA PAPER Published: 01 January 1986
STP32980S

Testing of Engine Coolant Inhibitors by an Electrochemical Method in the Laboratory and in Vehicles

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An electrochemical test based on the measurement of galvanic currents has been developed for water-glycol solutions on five different metallic materials. An acidity function is first defined for ethylene glycol, propylene glycol, and water glycols, which allows comparisons to be made of their aggressiveness towards metals. Different combinations of inhibitors are tested by using the method. It is shown that the method is particularly suitable for testing aluminum: the effects of inhibitors on the behavior of the oxide layer, on pitting tendency, and on general dissolution of the metal are easily detected. The corrosion parameters may be continuously monitored by inserting the electrochemical cell into the cooling system of a car.

Author Information

Fiaud, C
Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris, France
Netter, P
Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris, France
Tadjamoli, M
Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris, France
Tzinmann, M
Laboratoire de Corrosion, E.N.S.C.P., Université Pierre et Marie Curie, Paris, France
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Details
Developed by Committee: D15
Pages: 162–175
DOI: 10.1520/STP32980S
ISBN-EB: 978-0-8031-4959-5
ISBN-13: 978-0-8031-0432-7