1、Designation: D 2570 96 (Reapproved 2002)e1Standard Test Method forSimulated Service Corrosion Testing of Engine Coolants1This standard is issued under the fixed designation D 2570; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEAdjunct references were corrected editorially in April 2006.1. Scope1.1 This test method evaluates the effect of
3、a circulatingengine coolant on metal test specimens and automotive coolingsystem components under controlled, essentially isothermallaboratory conditions.1.2 This test method specifies test material, cooling systemcomponents, type of coolant, and coolant flow conditions thatare considered typical of
4、 current automotive use.1.3 The values stated in either SI or inch-pound units are tobe regarded as the standard. The values given in parenthesesare approximate equivalents for information only.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use.
5、It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific precau-tionary statements are given in Section 6.2. Referenced Documents2.1 ASTM Standards:2D 1121 Test Method
6、for Reserve Alkalinity of EngineCoolants and AntirustsD 1176 Practice for Sampling and Preparing Aqueous So-lutions of Engine Coolants or Antirusts for Testing Pur-posesD 1177 Test Method for Freezing Point of Aqueous EngineCoolantsD 1193 Specification for Reagent WaterD 1287 Test Method for pH of E
7、ngine Coolants and Anti-rustsD 1384 Test Method for Corrosion Test for Engine Coolantsin GlasswareD 2758 Test Method for Engine Coolants by Engine Dyna-mometerD 2847 Practice for Testing Engine Coolants in Car andLight Truck ServiceD 3306 Specification for Glycol Base Engine Coolant forAutomobile an
8、d Light-Duty ServiceD 4985 Specification for Low Silicate Ethylene GlycolBase Engine Coolant for Heavy Duty Engines Requiring aPre-Charge of Supplemental Coolant Additive (SCA)2.2 SAE Standard:3SAE J20e Standard for Coolant System Hoses2.3 ASTM Adjuncts:Coolant reservoir (1 drawing)Framework for tes
9、t equipment (3 drawings and B/M)3. Summary of Test Method3.1 An engine coolant is circulated for 1064 h at 190F(88C) in a flow loop consisting of a metal reservoir, anautomotive coolant pump, an automotive radiator, and connect-ing rubber hoses. Test specimens representative of enginecooling system
10、metals are mounted inside the reservoir, whichsimulates an engine cylinder block. At the end of the testperiod, the corrosion-inhibiting properties of the coolant aredetermined by measuring the mass losses of the test specimensand by visual examination of the interior surfaces of thecomponents.4. Si
11、gnificance and Use4.1 This test method, by a closer approach to engine coolingsystem conditions, provides better evaluation and selectivescreening of engine coolants than is possible from glasswaretesting (Test Method D 1384).The improvement is achieved bycontrolled circulation of the coolant, by th
12、e use of automotivecooling system components, and by a greater ratio of metalsurface area to coolant volume.4.2 Although this test method provides improved discrimi-nation, it cannot conclusively predict satisfactory corrosioninhibition and service life. If greater assurance of satisfactoryperforman
13、ce is desired, it should be obtained from full-scaleengine tests (Test Method D 2758) and from field testing inactual service (Practice D 2847).1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and is the direct responsibility of Subcommittee D15.09 on SimulatedServ
14、ice Tests.Current edition approved April 10, 1996. Published June 1996. Originallypublished as D 2570 66 T. Last previous edition D 2570 94.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volum
15、e information, refer to the standards Document Summary page onthe ASTM website.3Available from Society of Automotive Engineers, 400 Commonwealth Dr.,Warrendale, PA 15096.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.3 Significanc
16、e and interpretation of the test and its limi-tations are discussed further in Appendix X1.4.4 If this test method is used as a qualification test forSpecification D 3306 and Specification D 4985, the recom-mended components listed in Section 5 shall be used. If it is notbeing used for such qualific
17、ation purposes, then suitablesubstitution components may be used, if agreed upon betweenthe contracting parties.5. Apparatus5.1 ReservoirAn assembly drawing of this component4isshown in Fig. 1. The material of construction, representing thatof the engine cylinder block, shall be SAE G3500 Gray Iron
18、forAutomotive Castings.5Install a right angle fitting on the top ofthe resevoir for attachment of an air line. Install a shutoff valvein the air line to avoid backing up the solution into the pressurehose.5.2 Automotive ComponentsThese shall be those nor-mally used with a 4, 6, or 8-cylinder automob
19、ile engine used incurrent automobiles in the United States, in the 1.6 to 5.0-L(98to 305-in.3) range of piston displacement. General character-istics shall be as follows:5.2.1 RadiatorBrass,5GM part No. 3056740 (cross flow),with coolant recovery tank. An aluminum radiator, GM partNo. 3093506, may be
20、 used subject to mutual agreement of theparties involved.5.2.2 Radiator Pressure CapNormally open 12 to 15 psi(80 to 100 kPa), GM part No. 6410427.5.2.3 Coolant Pump5GM part No. 14033483 (aluminummatching front end cover). GM part No. 14033526 (aluminumprovides back cover), coolant discharge parts a
21、nd mounting forpump.5.2.4 Coolant OutletGM part No. 14033198 (aluminum).5.2.5 HosesReinforced elastomer, meeting the require-ments of SAE J20e.65.2.6 Hose ClampsPreferably worm-screw type (constanttension may be used).5.2.7 Hose Sight TubeA pyrex glass sight tube shall beinstalled in the top radiato
22、r hose. The tube should have a slightbead on each end. (The primary purpose of the sight tube is tosee that there is entrained air in the system.)5.3 Pipe FittingsThe preferred material for the fittingsrequired in the hose connections between pump discharge portsand reservoir inlet is malleable cast
23、 iron. A satisfactoryalternative is steel.5.4 Electric Motor112 hp (1.1 kW) or larger, drip-proof orexplosion-proof in accordance with local safety regulations.5.5 Pulleys and Drive BeltSized to drive the pump ataspeed that will produce a flow rate of 20 to 25 gal/min (1.3 to1.6 L/s) for the General
24、 Motors 173-in.3(2.8-L) V-6 engine.The flow rate may be determined by a flow measurementdevice7located between pump discharge and reservoir inlet, asindicated in Fig. 2. The pressure drop between pump dischargeand reservoir inlet, measured by the pressure gages shown inFig. 2, must be maintained whe
25、n the flow measurement deviceis removed from the system. This can be done by substitutingfor the flow measurement device a variable-flow restriction,such as a valve, which can be adjusted to produce the samepressure drop as that measured across the flow measurementdevice at the specified flow rate.5
26、.6 Electric HeaterAbout 2000 W, either a hot plate8installed under the reservoir or a circumferential, metal-cladheater band9around the reservoir.5.7 ThermoregulatorA suitable temperature regulator10shall be used to maintain the coolant temperature between thelimits specified by 9.3. The sensing uni
27、t of the regulator shallbe installed in an opening on the reservoir cover.5.8 ThermometerAn instrument11capable of indicatingcoolant temperature to the nearest 1F or 1C shall be installedin an opening on the reservoir cover.5.9 FrameworkA suitable framework shall be used tomount all the components a
28、s a unit.126. Safety Precautions6.1 ReservoirProtection against bursting shall be pro-vided, either by a pressure-relief valve on the cover or by asafety enclosure.6.2 Pump DriveAsafety guard for the coolant pump drivebelt and pulleys shall be provided.6.3 ElectricalElectrical circuits required for
29、operation ofmotor, heater, and thermoregulator shall be installed withsuitable precautions against electrical shock to operating per-sonnel in the event of accidental spills of electrically conduc-tive liquids.6.4 ThermalProtection of operating personnel againstburns from exposed metal surfaces, esp
30、ecially those of theheater, shall be provided.7. Metal Test SpecimensNOTE 1The specimens prescribed for this test method have beenaccepted by automobile manufacturers and are required for SpecificationsD 3306 and D 4985 qualification. Current production vehicles may havediffering alloy. Therefore, s
31、pecimens other than those designated in thistest method may be used by mutual agreement of the parties involved.4Detail drawings are available from ASTM International Headquarters. OrderAdjunct No.ADJ257001. Original adjunct produced in 1982. Reservoirs of cast ironor cast aluminum, made in accordan
32、ce with these drawings, may be obtained fromCommercial Machine Service, 1099 TouhyAve., Elk Grove Village, IL60007, (847)806-1901.5Aluminum or iron may be used if mutually agreed upon between the partiesinvolved.6Gates “Vulco Straight” bulk-length radiator hose, Product Type 4178, has beenfound sati
33、sfactory. Equivalent radiator hoses may be used.7Fischer and Porter Series 10A2235A Ratosight Flow Rate Indicator, 4 to 50gal/min (0.3 to 3.0 L/s), of bronze construction, has been found satisfactory.Equivalent flow measuring devices may be used.8Chromalox No. ROPH-204 has been found satisfactory. E
34、quivalent hot platesmay be used.9Chromalox No. HB-8415 has been found satisfactory. Equivalent heater bandsmay be used.10Chromalox No. AR-2524P has been found satisfactory. Equivalent ther-moregulators may be used.11Fischer Scientific No. 15-076D and Weston No. 2261 dial-type thermometershave been f
35、ound satisfactory. Equivalent thermometers may be used.12Detail and assembly drawings of a suitable framework and arrangement ofcomponents thereon are available from ASTM International Headquarters. OrderAdjunct No. ADJ257002. Original adjunct produced in 1982.D 2570 96 (2002)e127.1 The description,
36、 specification, preparation, cleaning,and weighing of the metal test specimens to be used in this testmethod are given in detail in Test Method D 1384. However,the solid solder specimen allowed as an alternative in TestMethod D 1384 shall not be used in this test method, as it hasbeen known to bend
37、and contact an adjoining specimen.NOTE 2The procedure for the cleaning of aluminum alloy couponswas changed in 1995 to eliminate the use of chromic acid, a recognizedhealth hazard.7.2 ArrangementThe metal test specimens shall be drilledthrough the center with a1764-in. (6.8-mm) drill to accommo-date
38、 a 212-in. (65-mm) 1024 brass machine screw coveredwith a thin-walled insulating sleeve. Polytetrafluoroethylenetubing with a14-in. (6.4-mm) outside diameter and a wallthickness of164 in. (0.4 mm) is satisfactory. The standard test“bundle” shall be assembled on the insulated screw with thespecimens
39、in the following order, starting from the screw head:copper, solder, brass, steel, cast iron, and cast aluminum. Thespecimens shall be separated by316-in. (5-mm) thick solidmetal and insulating spacers having a1764-in (6.8-mm) insidediameter and a 7.16-in. (11-mm) outside diameter. Brassspacers shal
40、l be used between the copper, solder, and brassspecimens, and steel spacers between the steel, cast iron, andcast aluminum specimens. Insulating spacers made from poly-tetrafluoroethylene shall be used between the screw head andthe copper specimen, between the brass and steel specimens,and between t
41、he cast aluminum specimen and a brass nut. Thenut shall be tightened firmly to ensure good electrical contactbetween the test specimens in each section of the bundle. Asshown in Fig. 3, each bundle shall be positioned on a bracketmounted on the cap of the reservoir and fastened in place withanother
42、brass nut; the 2-in. (50-mm) dimensions of the testspecimens shall be horizontal when inserted into the reservoir.8. Test Solution8.1 The coolant to be tested shall be a 44 % by volumeglycol-based coolant prepared with corrosive water (Note 3)togive a solution having a freezing point of 20 6 2F (29
43、61C). The corrosive water shall contain 100 ppm each ofsulfate, chloride, and bicarbonate ions introduced as thesodium salts. Preparation of the sample shall be done inaccordance with Section 6 of Test Method D 1176, withFIG. 1 ReservoirD 2570 96 (2002)e13corrosive water used for dilution. Thus, any
44、 insoluble materialswill be included in the representative sample. The freezingpoint of the coolant solution may be determined by TestMethod D 1177.NOTE 3The specified corrosive water can be prepared by dissolvingthe following amounts of anhydrous sodium salts in a quantity of distilledor deionized
45、water:Sodium sulfate 148 mgSodium chloride 165 mgSodium bicarbonate 138 mgThe resulting solution should be made up to a volume of 1 L withdistilled or deionized water at 20C.If relatively large amounts of corrosive water are needed for testing, aconcentrate may be prepared by dissolving ten times th
46、e above amounts ofthe three chemicals, in distilled or deionized water, and adjusting the totalvolume to 1 L by further additions of distilled or deionized water. Whenneeded, the corrosive water concentrate is diluted to the ratio of one partby volume of concentrate to nine parts of distilled or dei
47、onized water.9. Test Conditions9.1 AssemblyThe essential arrangement of the reservoir,radiator, coolant pump, and connecting hoses is shown in Fig.2. The gasketed coolant outlet is bolted to the reservoir cover.9.2 Coolant FlowThe coolant flow shall be maintained at23 6 1 gal/min (1.3 to 1.6 L/s).9.
48、3 TemperatureThe test coolant shall be maintained at atemperature of 190 6 5F (88 6 3C) throughout the testexcept during shutdown periods.9.4 DurationThe test shall be run for 152 h/week for 7weeks. Operation shall be continuous, except for two 8-hshutdowns each week, until 1064 h of operation have
49、beencompleted.10. Preparation of Apparatus10.1 ReservoirSand blast or bead blast the interior sur-faces of the reservoir and its cover to remove all rust and scaleFIG. 2 Assembly of Test ApparatusD 2570 96 (2002)e14from previous tests. Wash13and brush to remove all traces ofsand; then dry with pressurized air. Visually examine thereservoir and cover. If spots so deeply corroded as to render useof the vessel unsafe are found, or if leaks are present, obtain anew reservoir and cover. Place a Buna N O-ring between thereservoir and
