This test method covers a beaker-type procedure for evaluating the effects of engine coolants on metal specimens under controlled laboratory conditions.
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In this test method, specimens of metals typical of those present in engine cooling systems are totally immersed in aerated engine coolant solutions for 336 h at 88°C (190°F). The corrosion-inhibitive properties of the test solution are evaluated based on the weight changes incurred by the specimens. Each test is run in triplicate, and the average weight change is determined for each metal. A single test may occasionally be completely out of line. This test method will generally distinguish between coolants that are definitely deleterious from the corrosion standpoint and those that are suitable for further evaluation. However, the results of this test method cannot stand alone as evidence of satisfactory corrosion inhibition.
The actual service value of an engine coolant formulation can be determined only by more comprehensive bench, dynamometer, and field tests.
