5. Apparatus
5.1 Container - A 1000-mL, tall-form, spoutless beaker, made of heat-resistant glass, for containing the engine coolant solution and test specimens. The beaker shall be tightly closed with a No. 15 rubber stopper, having drill holes to accommodate a water condenser, an aerator tube, and a thermometer as shown in Fig. 1.
5.2 Condenser - A water condenser of the reflux, glass-tube type, having a 400-mm (16-in.) condenser jacket.
5.3 Aerator Tube - A gas-dispersion tube, porosity size 12-C, to assure continuous aeration without plugging.
5.4 Thermometer - An ASTM Partial Immersion Thermometer having a range from -20 to 150°C (0 to 302°F) and conforming to the requirements for Thermometer 1C (1F), as prescribed in Specification E 1.
5.5 Heater - Aconstant-temperature bath containing a high-boiling liquid (see Note 2) that is capable of giving continuous service with the specified temperature control. The size ofthe bath will be determined by the number of corrosion tests that are to be run concurrently.
6. Metal Test Specimens
NOTE 2 - The specimens prescribed in this test method have been accepted by automobile manufacturers, but their composition may not be the same as that of alloys currently used for engine cooling system components. Therefore, specimens other than those designated in this test method may be used by mutual agreement of the parties involved.
6.1 Type - The following metal test specimens, representative of cooling system metals, shall be used:
6.1.1 Steel, UNS G10200 (SAE 1020), cut from 1.59-mm (1/16 -in.) cold-rolled sheet stock to size 50.8 by 25.4 mm (2 by 1 in.). Chemical composition of the carbon steel is as follows: carbon, 0.17 to 0.23 %; manganese, 0.30 to 0.60 %; phosphorus, 0.040 % maximum; sulfur, 0.050 % maximum.
6.1.2 Copper, conforming to UNS C11000 (SAE CA110) or UNS C11300 (SAE CA113). Cold-rolled, cut from 1.59-mm (1/16 -in.) sheet stock to size 50.8 by 25.4 mm (2 by 1 in.).
6.1.3 Brass, conforming to Alloy UNS C26000 (SAE CA 260). Half-hard, cut from 1.59-mm (1/16 -in.) sheet stock to size 50.8 by 25.4 mm (2 by 1 in.).
6.1.4 Solder - A brass specimen as described in 6.1.3, coated with solder conforming to Alloy Grade 30A (SAE 3A) of Specification B 32. Solder-coated specimens may be prepared, or used specimens recoated for reuse, by the procedure given in Annex A1. A solid solder specimen cut from 1.59-mm (1/16 -in.) sheet stock ofAlloy Grade 30A (SAE 3A) to size 50.8 by 25.4 mm (2 by 1 in.) may be used subject to mutual agreement of the parties involved. The use of a solid solder specimen must be reported along with the metal specimen weight loss results.
6.1.4.1 When agreed upon between the supplier and the purchaser of engine coolants, the standard solder specimen may be replaced with one having a different alloy composition than standard Alloy Grade 30A or 30B. Use of specimens other than standard Alloy Grade 30Aor 30B shall be noted in the test report.
NOTE 3 - Where non-standard alloy is used, the standard flux shown in A1.1.5 may not be satisfactory. A low corrosive flux may be required.
6.1.5 Cast Aluminum, conforming to Alloy UNS A23190 (SAE 329). Specimen size, 50.8 by 25.4 by 3.18 mm (2 by 1 by 1/8 in.).
6.1.6 Cast Iron, conforming to Alloy UNS F10007 (SAE G3500). Specimen size, 50.8 by 25.4 by 3.18 mm (2 by 1 by 1/8 in.).
6.2 Arrangement (See Fig. 2):
6.2.1 Metal Specimen Arrangement - None of the hardware used in metal specimen arrangement (metal specimen, screws, washers, metal spacers, insulating sleeves, insulating spacers and nuts) can be reused for a test. The metal test specimens shall be drilled through the center with a 6.75-mm (17/64 -in.) drill to accommodate a 50.8-mm (2-in.) 10 - 24 brass machine screw covered with a thin-walled insulating sleeve. Tetrafluo-roethylene tubing with a 6.35-mm (1/4 -in.) outside diameter 1.59-mm (1/16 -in.) wide and a wall thickness of 0.4 mm (1/64 -in.) is satisfactory. Two half-hard brass legs shall be cut from 1.59-mm (1/16 -in.) sheet stock to size 50.8 by 25.4 mm (2 by 1 in.). A 6.35-mm (1/4 -in.) diameter hole shall be drilled in each leg with the center 6.35 mm (1/4 in.) from the top and 12.7 mm (1/2 in.) from each side. The test "bundle" shall be made up on the insulated screw with the specimens in the following order: brass leg, copper, solder, brass, steel, cast iron, cast aluminum, and brass leg. The specimens shall be separated by 4.76-mm (3/16 -in.) thick solid metal spacers having a 6.75-mm (17/64 -in.) inside diameter and a 11.11-mm (7/16 -in.) outside diameter. Insulating spacers made from tetrafluoroethylene shall be used between the brass legs and the specimen "bundle", and between the brass and steel specimens. Brass spacers shall be used between the brass, solder, and copper specimens, and steel spacers between the cast iron, steel, and cast aluminum specimens. The nut shall be tightened firmly to ensure good electrical contact between the test specimens in each section of the "bundle".
6.2.2 Alternate Metal Specimen Arrangement - When agreed upon between the supplier and the purchaser, an alternate metal specimen arrangement may be used to evaluate multiple solder alloys, such as high leadAlloy Grade L50113 consisting of 97 % lead, 2.5 % tin, 0.3 % silver, concurrently with Standard Alloy Grade 30A or 30B. It is recommended that the metal specimen arrangement be modified by replacing the copper specimen with the high lead solder specimen and arranging specimens in the bundle as follows:
Use of alternate specimens and metal specimens arrangements shall be noted in the test report.