ASTM D2570 Test Method for Simulated Service Corrosion Testing of Engine Coolants
9. Test Conditions
9.1 Assembly - The essential arrangement of the reservoir, radiator, coolant pump, and connecting hoses is shown in Fig. 2. The gasketed coolant outlet is bolted to the reservoir cover.
9.2 Coolant Flow - The coolant flow shall be maintained at 23 +/- 1 gal/min (1.3 to 1.6 L/s).
9.3 Temperature - The test coolant shall be maintained at a temperature of 190 +/- 5°F (88 +/- 3°C) throughout the test except during shutdown periods.
9.4 Duration - The test shall be run for 152 h/week for 7 weeks. Operation shall be continuous, except for two 8-h shutdowns each week, until 1064 h of operation have been completed.
10. Preparation of Apparatus
10.1 Reservoir - Sand blast or bead blast the interior surfaces of the reservoir and its cover to remove all rust and scale from previous tests. Wash and brush to remove all traces of sand; then dry with pressurized air. Visually examine the reservoir and cover. Ifspots so deeply corroded as to render use of the vessel unsafe are found, or if leaks are present, obtain a new reservoir and cover. Place a Buna N O-ring between the reservoir and the cover to effect a seal; then fasten the cover with bolts as shown in Fig. 1.
10.2 Automotive Components - The radiator, coolant pump, and connecting hoses shall be new for each test.
NOTE 5 - Where performance certification is not required, used components may be employed if it can be demonstrated to the satisfaction of the parties involved that the method of 10.4.1 - 10.4.4 has effectively cleaned the interior surfaces of the used components.
10.3 Assembly - Assemble the components as shown in Fig. 2, but with metal test specimens omitted.
10.4 Cleaning the System:
10.4.1 Fill the system with water at 140 to 160°F (60 to 70°C). Add 25 g of a detergent cleaner such as "Alconox". Turn pump and heater on and operate for 30 min at 190°F (88°C). Drain.
10.4.2 Flush the system with water at 140 to 160°F (60 to 70°C) for 15 min, and then drain.
10.4.3 Fill the system with water at 140 to 160°F (60 to 70°C). Turn on the pump and heater and operate for 15 min at 190°F (88°C). Take a 100-mL sample, and then drain the system.
10.4.4 If sediment or foaming is evident in the sample, repeat 10.4.2 and 10.4.3 until a clear, nonfoaming sample can be obtained. Then completely drain the system.
10.5 Attach three bundles of metal test specimens to the bracket connected to the cap on the reservoir cover and install in the reservoir, with orientation as shown in Fig. 3.
