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The Role of Carboxylate-Based Coolants in Cast Iron Corrosion Protection
Technical Paper
2001-01-1184
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
Nitrites have long been added to heavy-duty coolant to inhibit iron cylinder liner corrosion initiated by cavitation. However, in heavy-duty use, nitrites deplete from the coolant, which then must be refortified using supplemental coolant additives (SCA's). Recently, carboxylates have also been found to provide excellent cylinder liner protection in heavy-duty application. Unlike nitrites, carboxylate inhibitors deplete slowly and thus do not require continual refortification with SCA's.
In the present paper laboratory aging experiments shed light on the mechanism of cylinder liner protection by these inhibitors. The performance of carboxylates, nitrites and mixtures of the two inhibitors are compared. Results correlate well with previously published fleet data. Specifically, rapid nitrite and slow carboxylate depletion are observed. More importantly, when nitrite and carboxylates are used in combination, nitrite depletion is repressed while carboxylates deplete at a very slow rate. Results show that carboxylate inhibition greatly assists the nitrite mechanism in cylinder liner protection. Laboratory findings are supplemented with field experience. Engine tear-downs reveal excellent cylinder cavitation protection for carboxylate based coolants with nitrite.
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Authors
Citation
Pellet, R., Bartley, L., and Hunsicker, D., "The Role of Carboxylate-Based Coolants in Cast Iron Corrosion Protection," SAE Technical Paper 2001-01-1184, 2001, https://doi.org/10.4271/2001-01-1184.Also In
SAE 2001 Transactions Journal of Passenger Cars - Mechanical Systems
Number: V110-6; Published: 2002-09-15
Number: V110-6; Published: 2002-09-15
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