关键词: 电动汽车；液冷系统；低电导率冷却液；乙二醇冷却液；腐蚀

Abstract: A comprehensive performance evaluation of three low-conductivity ethylene glycol coolants was conducted under test conditions more stringent than those stipulated by the national standard. The study focused on static corrosion, high-temperature stability, cyclic bench corrosion, and flux compatibility, with particular emphasis on comparing the corrosivity of the three lowconductivity coolants toward aluminum alloys in liquid cooling system, especially AL4343 and AL4045, as well as the changes in key coolant parameters. The potential application value of the low-conductivity coolants was comprehensively assessed. The test results show that under identical test conditions, the compatibility of the three low-conductivity coolants with AL4343 and AL4045 shows no significant overall difference from that with other aluminum alloys, whereas significant differences exist among the different coolants. Based on the comprehensive results of static corrosion, high-temperature stability, cyclic bench corrosion, and flux compatibility tests, compared with 1# and 2# coolants, the 3# coolant exhibits superior performance in static corrosion, high-temperature stability, and flux compatibility, but performs less favorably in cyclic bench corrosion. A comprehensive evaluation suggests that the 3# coolant has preliminarily demonstrated potential for batch application.

Key words: electric vehicle; liquid cooling system; low-conductivity coolant; ethylene glycol coolant; corrosion