ASTM D2570 Test Method for Simulated Service Corrosion Testing of Engine Coolants
12. Report
12.1 Report the following information:
12.1.1 Corrosion weight losses, to the nearest 1 mg, of the individual specimens from each bundle, corrected for cleaning losses,
12.1.2 Average corrected weight loss for the triplicate specimens of each test metal,
12.1.3 Appearance of the cleaned metal specimens: pitting, erosion, color, brightness, extent of any residual corrosion products, etc.,
12.1.4 Appearance of the interior surfaces of the reservoir, coolant outlet, coolant pump, hoses, and radiator,
12.1.5 pH, reserve alkalinity, and appearance of coolant samples, concentration of antifreeze in the initial and final coolant samples,
12.1.6 Detailed description of test conditions and procedures differing from those specified by this test method, and
12.1.7 Characteristics (material, type, manufacturer, part number, etc.) ofthe components that were employed in the test, their initial condition (new or used), and the cleaning procedure used.
13. Precision and Bias
13.1 Precision - It is not practical to specify the precision of the procedure in this test method because this test method is a screening tool. The replication of specimen mass losses among three sets in one test may be excellent, but the procedure is not expected to give results closer than 64 mg per specimen.
13.1.1 Repeatability - Repeatability of the specimen weight losses between tests of the same laboratory may have a greater range of values than replication.
13.1.2 Reproducibility - Reproducibility of mass losses between tests at different laboratories is generally poorer than repeatability and in some instances may vary widely.
13.1.3 Repeatability and Reproducibility - These usually become poorer where corrosion mass losses exceed 60 mg per specimen. In such situations more than one test should be conducted.
13.2 Bias - Since there is no accepted reference material suitable for determining the bias for the procedure in this test method, bias has not been determined.
14. Keywords
14.1 automotive; corrosion; engine coolants; simulated service
