ASTM D1384 Corrosion Test for Engine Coolants in Glassware

Coolants used in engines may come in contact with many types of metals. For instance, radiators in newer engines contain aluminum, and older engines contain brass and copper; thermostats contain copper; engines contain steel; water pump housings contain cast iron and cast aluminum. A coolant that reacts with any of these metals may not be appropriate for use in engines. This test screens coolants for reactivity with copper, solder, brass, steel, cast aluminum and cast iron. It is intended for new, unused coolants.

The metals are prepared as per the method. The coolant is diluted using specially prepared “corrosive water” to simulate changes a coolant may undergo during use. The prepared metals and prepared sample are placed in a beaker fitted with a rubber stopper, condenser and aerator tube. The mixture is brought to the test temperature, aeration is started and the sample is refluxed for the test time. At the conclusion of the test, the metals are removed, cleaned, dried and weighed. The weight change in the metals is reported.