ASTM D1384 Test Method for Corrosion Test for Engine Coolants in Glassware
10. Procedure
10.1 Make triplicate tests concurrently on each engine coolant solution in accordance with the following procedure:
10.1.1 Carefully clean the test beaker, condenser, rubber stopper, and aerator tube, and thoroughly rinse with water.
10.1.2 Bolt the specimens together in the order given in 6.2 and place the "bundle" in the test beaker as shown in Fig. 1.
10.1.3 Pour 750 mL of the prepared test solution into the 1000-mL beaker.
10.1.4 Fit the condenser and aeration tube to the beaker, and set the aeration rate at 100 mL/min, using a flowmeter or other suitable device.
10.1.5 Raise the temperature of the test solution to 88°C (190°F) for high-boiling engine coolants. Pass water through the condenser at a rate sufficient to maintain adequate cooling.
10.1.6 Check the tests once each working day to ensure proper solution temperature, aeration rate, and solution level. The tests may operate unattended on weekends and holidays. Make up evaporation losses during the corrosion tests by addition of distilled or deionized water.
10.1.7 At the end of the test, immediately disassemble specimens and brush very lightly with a soft bristle brush and water to remove loosely held corrosion products. To remove the more tenacious corrosion products and films, the individual specimens shall then be subjected to additional cleaning treatments as follows:
10.1.7.1 Iron and Steel - Remove adherent deposits by means of a brass scraper or brass bristle brush, followed by scrubbing with a wet bristle brush and fine pumice to clean the specimen completely.
10.1.7.2 Copper and Brass - Dip in a 1 + 1 mixture of concentrated HCl (sp gr 1.19) and water for 15 s to remove tarnish films, rinse with tap water to remove acid, and scrub with a wet bristle brush and fine pumice powder. (Warning - HCl is a strong acid. Avoid contact with skin and eyes. Handle in a fume hood.)
10.1.7.3 Aluminum - In a fume hood, dip for 10 min in an aqueous solution containing 4 parts concentrated nitric acid (HNO3, 70 mass %) plus one part distilled water at 25°C (76°F). Rinse thoroughly with water, then brush very lightly with a soft bristle brush to remove any loose films, and again rinse with water. Dry the specimen in a 100°C oven for 1 h, to a constant weight prior to recording the weight. (Warning - HNO3 is a strong toxic oxidant and acid. Avoid contact with skin, eyes, and clothing. Do not breathe vapor. Handle in a fume hood.)
10.1.7.4 Solder - Immerse for 5 min in boiling 1 % glacial acetic acid. Rinse in water to remove the acid, and brush very gently with a soft bristle brush to remove any loosened material. (Warning - Avoid contact with skin and eyes with glacial acetic acid. Handle in a fume hood.)
10.1.8 The acid dip times given in 10.1.7 for the cleaning of nonferrous specimens are average values found to be adequate in most cases. Other times, suggested by experience, may be used if necessary, if gross weight losses are adjusted by the appropriate tare.
10.1.9 Follow each of the four operations noted above by thorough rinsing, first in tap water and then in acetone. Then dry and weigh the specimens to the nearest 1 mg. Store in a desiccator specimens that cannot be weighed immediately.
10.1.10 Because cleaning methods and materials may vary among laboratories, occasionally determine cleaning losses obtained by a particular operator on an untested set of triplicate metal specimens. Deduct the average cleaning losses from gross weight differences to determine actual corrosion losses.
