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An investigation of the performance of corrosion inhibitors for ethanediol-based coolants for internal combustion engines and the development of test methods for studying the behavior of coolants in nucleate boiling conditions are described. Inhibitor formulations are reported which provide good protection to cast iron, an aluminium alloy, copper, brass and solder. Three types of test procedures involving high rates of metal-to-coolant heat transfer have been developed in which the effects of the composition, flow rate, pressure and temperature of the coolant and of the heat flux through the metal on the surface temperature of test specimens can be followed. Results are provided for a formulation consisting of sodium sebacate and benzotriazole and some comparisons made with an existing formulation.
corrosion prevention, corrosion inhibitors, coolants, cooling systems, antifreezes, cast iron, aluminum alloys, brass, copper, solder, heat transfer, nucleate boiling, corrosion tests, surface temperature
National Physical Laboratory, Teddington, Middlesex