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98545 THE ROLE OF NITRITE AND CARBOXYLATE IONS IN REPRESSING DIESEL ENGINE CYLINDER LINER CAVITATION CORROSION

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Product Number: 51300-98545-SG
ISBN: 98545 1998 CP
Author: Douglas Hunsicker, Regis Pellet, Paul Van de Ven, Daniel Amaez, Paul Fritz, Leonard Bartley
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Nitrites have long been added to heavy duty coolants to inhibit iron cylinder liner corrosion initiated by cavitation. Many papers have attributed the inhibition effect of nitrite to the formation of an iron oxide layer at the surface of the liner. This oxide is presumed to be resistant to corrosion damage. Recently, carboxylates have also been found to provide excellent cylinder liner protection in heavy duty application. A mechanism for carboxylate protection of cylinder liners has yet to be published. The present paper explores the effects of the combination of carboxylates and nitrite ion in protecting iron surfaces against corrosion. Electrochemical cyclic polarization studies shed new light on the protection mechanism of each component by itself as well as a surprising effect observed when both inhibitors are used in combination. Keywords: cast iron corrosion, inhibition, nitrites, carboxylates, cyclic polarization
Nitrites have long been added to heavy duty coolants to inhibit iron cylinder liner corrosion initiated by cavitation. Many papers have attributed the inhibition effect of nitrite to the formation of an iron oxide layer at the surface of the liner. This oxide is presumed to be resistant to corrosion damage. Recently, carboxylates have also been found to provide excellent cylinder liner protection in heavy duty application. A mechanism for carboxylate protection of cylinder liners has yet to be published. The present paper explores the effects of the combination of carboxylates and nitrite ion in protecting iron surfaces against corrosion. Electrochemical cyclic polarization studies shed new light on the protection mechanism of each component by itself as well as a surprising effect observed when both inhibitors are used in combination. Keywords: cast iron corrosion, inhibition, nitrites, carboxylates, cyclic polarization
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