An inhibitor pakage which is silicate-, nitrate-, borate- and phosphate-free has been developed as the basis for a world-wide automative coolant formulation. The formulation contains aliphatic mono- and dicarboxylic acids and tolytriazole as the sole inhibitors. Formulations containing carboxylic acid inhibitors have been studied in ASTM bench tests and found to sufficiently protect all prevalent cooling system metals. In addition, fleet tests have shown that carboxylic acide inhibitors deplete much more slowly than conventional inhibitors, making possible a much longer life coolant. Results from laboratory tests which simulate extended usage indicated that carboxylic acid-containing coolants have a significantly longer life span for the protection of all cooling system metals. Finally, the carboxylic acid/tolyltriazole inhibitor package is completely adaptable to a propylene glycol base.
Long life performance of carboxylic acid based coolants
Langzeitverhalten von Kühlmitteln auf Carbonsäurebasis
SAE Technical Papers ; 1-5
1994
5 Seiten, 10 Bilder, 2 Tabellen, 8 Quellen
Conference paper
English
Long Life Performance of Carboxylic Acid Based Coolants
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