1、Designation: D6557 10aStandard Test Method forEvaluation of Rust Preventive Characteristics of AutomotiveEngine Oils1This standard is issued under the fixed designation D6557; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers a Ball Rust Test (BRT) proce-dure for evaluating the anti-rust ability of fluid lubricant
3、s. Theprocedure is particularly suitable for the evaluation of automo-tive engine oils under low-temperature, acidic service condi-tions.1.2 Information Letters are published occasionally by theASTM Test Monitoring Center (TMC)2to update this testmethod. Copies of these letters can be obtained by wr
4、iting thecenter.1.3 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3.1 ExceptionsWhere there is no direct equivalent, suchas the units for screw threads, national pipe threads/diameters,and tubing size.1.4 This standard does
5、not purport to address all of thesafety concerns, if any, associated with its use. 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. See 7.1.1-7.1.3 and8.2.1.1.2. Referen
6、ced Documents2.1 ASTM Standards:3D4175 Terminology Relating to Petroleum, PetroleumProducts, and LubricantsD5844 Test Method for Evaluation of Automotive EngineOils for Inhibition of Rusting (Sequence IID)43. Terminology3.1 Definitions:3.1.1 calibrate, vto determine the indication or output ofa devi
7、ce (e.g., thermometer, manometer, engine) with respectto a standard.3.1.2 corrosion, nthe chemical or electrochemical reac-tion between a material, usually a metal surface, and itsenvironment that can produce a deterioration of the materialand its properties. D41753.1.3 non-reference oil, nany oil o
8、ther than a referenceoil, such as a research formulation, commercial oil, or candi-date oil. D41753.1.4 reference oil, nan oil of known performance char-acteristics, used as a basis for comparison. D41753.1.4.1 DiscussionReference oils are used to calibratetesting facilities, to compare the performa
9、nce of other oils, orto evaluate other materials (such as seals) that interact withoils.3.1.5 rust (coatings), nof iron or its alloys, a corrosionproduct consisting of hydrated iron oxides, usually reddish incolor but can also be brown-to-black.3.1.6 test oil, nany oil subjected to evaluation in ane
10、stablished procedure.3.2 Definitions of Terms Specific to This Standard:3.2.1 average gray value (AGV), nmeasurement ofbrightness units on test specimens, indicating the degree of rustprotection.3.2.2 specimen, na carbon steel ball, 5.6 mm (AISI 1040).4. Summary of Test Method4.1 Multiple test tubes
11、, each containing test oil and aspecimen, are placed in a test tube rack, which is attached to amechanical shaker. The shaker speed and temperature arecontrolled.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of
12、SubcommitteeD02.B0.01 on Passenger Car Engine Oils.Current edition approved Oct. 1, 2010. Published November 2010. Originallyapproved in 2000. Last previous edition approved in 2010 as D655710. DOI:10.1520/D6557-10A.2Until the next revision of this test method, the ASTM Test Monitoring Centerwill up
13、date changes in the test method by means of information letters. Informationletters may be obtained from theASTM Test Monitoring Center, 6555 PennAvenue,Pittsburgh, PA 15206-4489. This test method is supplemented by InformationLetters and Memoranda issued by the ASTM TMC. This edition incorporatesre
14、visions in all Information Letters through No. 0701.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Withdraw
15、n. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Air and an acidic solution are continuously fed into eachtest tube over an 18 h period to creat
16、e a corrosive environment.4.3 The specimens are then removed, rinsed, and analyzedby an optical imaging system designed to quantify the antirustcapability of each test oil.5. Significance and Use5.1 This bench test method was designed as a replacementfor Test Method D5844. Test Method D5844 was desi
17、gned tomeasure the ability of an engine oil to protect valve traincomponents against rusting or corrosion under low tempera-ture, short-trip service, and was correlated with vehicles in thattype of service prior to 1978.55.1.1 Correlation between these two test methods has beendemonstrated for most,
18、 but not all, of the test oils evaluated.6. Apparatus6.1 Specimen Preparation SystemObtain the specimensfrom the Central Parts Distributor (CPD).6,76.1.1 Specimen preparation equipment includes variouscommon laboratory apparatus and an ultrasonic cleaning bath.6.2 Air Supply SystemA compressed air s
19、upply is re-quired, with two air filters, two pressure regulators, a gaspurifier, a gassing manifold (25 port outlet), TFE-fluorocarbontubing (25 lengths, each 183 m) or equivalent multiport flowcontrol system, and a calibrated flowmeter (see Annex A1 andFigs. 1 and 2).6.3 Acid Solution Delivery Sys
20、temAn acid solution deliv-ery system that includes a multiple syringe pump with a tenposition rack is required. The flow rate range minimum, usinga 0.5 L syringe, is 0.0001 L/h. The flow rate maximum,using a 140 mL syringe, is 220.82 mL/min (see Figs. 3 and 4).6.4 Test Tube AssemblyThe test tube ass
21、embly consists of24 disposable plastic syringes and other common laboratoryapparatus.6.5 Temperature and Shaking Speed Control SystemAmechanical shaker, Bench-Top Environ Shaker Model 4628,7,8provides an orbital shaking motion in a controlled speed andtemperature environment.6.5.1 Aspecial test tube
22、 assembly rack7,9(see Figs. 5 and 6)has 24 tube positions and is attached to the shaker platform(457 by 457) mm.6.6 Air Delivery Manifold, required.6.7 Venting SystemCommon laboratory apparatus is em-ployed for the required venting system (see Fig. 7).6.8 Image Analysis SystemA specific imaging anal
23、ysissystem7,10is required. This system is composed of:6.8.1 Optics and Illumination:6.8.1.1 Nikon Epiphot 200 inverted metallurgical micro-scope,6.8.1.2 BZ binocular head,6.8.1.3 RV 3 plate mechanical stage,6.8.1.4 CFWN 103 wide field eyepiece, high point eye-piece,6.8.1.5 Manual BD 5 place nosepiec
24、e,6.8.1.6 Epiphot 300 EB block,6.8.1.7 DF module,6.8.1.8 CF BD plan 53/0.13 plan achromat objective,6.8.1.9 CF BD plan 103/0.13 plan achromat objective,6.8.1.10 EPI polarizer,6.8.1.11 Analyzer,6.8.1.12 Lamphouse for 12 V/100 W quartz halogen lightsource,6.8.1.13 Lamphouse adapter,6.8.1.14 12 V/100 W
25、 halogen bulbs,6.8.1.15 300/200 100 W power supply,6.8.1.16 Remote control cable,6.8.1.17 C-mount coupler for video camera,6.8.1.18 NCB 11 filter,6.8.1.19 Power cords, and5Special Technical Publication, “Multicylinder Test Sequences for EvaluatingAutomotive Engine Oils,” Part, Sequence IIID ASTM STP
26、 315H, Available fromASTM Headquarters.6The sole source of supply of the apparatus known to the committee at this timeis Central Parts Distributor, Test Engineering Inc., 12718 Cimmaron Path, SanAntonio, TX 78249.7If you are aware of alternative suppliers, please provide this information toASTM Head
27、quarters.Your comments will receive careful consideration at a meetingof the responsible technical committee, which you may attend.8The sole source of supply of the apparatus known to the committee at this timeis Labine, Inc., 15thand Bloomingdale, Melrose Park, IL 60160.9The sole source of supply o
28、f the apparatus known to the committee at this timeis West End Machine and Weld, Inc., P.O. Box 9444, Richmond, VA 23228.10The sole source of supply of the apparatus known to the committee at this timeis Meyer Instruments, Inc., 1304 Langham Creek, Suite 235, Houston, TX 77084.FIG. 1 Photograph of A
29、ir Delivery SystemFIG. 2 Schematic of Air Delivery SystemD6557 10a26.8.1.20 Ultracentrifuge tube spacer witha5mmholedrilled in the center (used as a sample holder and samplerandomizer for sample orientation).6.8.2 Image Capture Hardware and Software:6.8.2.1 Research grade, high resolution, NTSC RGB/
30、RS-170 camera system,6.8.2.2 Research grade, high resolution, NTSC RGB/RS-170 frame grabber,6.8.2.3 The host computer system (shall meet or exceed thefollowing specifications):(1) HardwarePentium 133 MHz CPU, 16 MB RAM, 540MB hard drive, 1.44 MB 90 mm floppy, 1.44 MB 130 mmfloppy (optional), CD-ROM
31、(highly recommended option),101 or Windows 95 keyboard, SVGAlocal bus video card with2 MB RAM (4 MB recommended), 2 button serial mouse withpad, 2 parallel ports, and 2 serial ports.(2) SoftwareWindows 3.x/DOS 6.22 or Windows 95Operating System, Microsoft Excel 7.0 (Microsoft Office 97recommended).(
32、3) MonitorMedical grade high-resolution 485 mmNTSC RGB color video monitor, all necessary cables, connec-tors, and adapters (including a surge and spike suppressingpower strip).6.8.3 BRT Image Analysis Software:6.8.3.1 BRT macro program, andFIG. 3 Photograph of Acid Delivery SystemFIG. 4 Schematic o
33、f Acid Delivery SystemFIG. 5 Test Tube Assembly RackFIG. 6 Photograph of Test Tube Assembly RackFIG. 7 Gassing Manifold for VentingD6557 10a36.8.3.2 Optimate image analysis engine.7. Reagents and Materials7.1 Reagents:7.1.1 Acid Solution (WarningCorrosive. Combustible.Health hazard)Obtain the acid s
34、olution from the CPD.NOTE 1For information only. Appendix X1 contains details of theacid solution.7.1.2 Acetone, 99.5 %. (WarningFlammable. Health haz-ard.)7.1.3 n-Heptane, (38 to 42) % (purity), commercial grade,with C7isomers. (WarningFlammable. Health hazard.)7.2 Materials:7.2.1 TFE-fluorocarbon
35、FEP Tubing, inside diameter (I.D.)0.8 mm, outside diameter (O.D.) 1.6 mm, 17 rolls, each roll305 m. (Not required if the optional NRS flow controller7,11isused.)7.2.2 Vinyl Tubing, about 4.6 m in length with an (I.D.) 3.2mm and an (O.D.) 6.4 mm.7.2.3 Miscellaneous Common Laboratory Equipment, in-clu
36、ding glassware, tubing fittings, trays, vials, and plasticsyringes.8. Preparation of Apparatus8.1 Specimens:8.1.1 Remove the appropriate number of specimens fromvacuum-sealed packages into a 118 mL bottle (clear, medium-round with cap). Add sufficient heptane (see 7.1.3), approxi-mately 59 mL, to co
37、ver specimens.8.1.2 Cap the bottle loosely and place it in an ultrasoniccleaning bath. Sonicate for 30 min, and then decant theheptane.8.1.3 Rinse two more times with heptane and follow with anacetone (see 7.1.2) rinse to ensure the specimens are free ofcontamination. Dry the specimens with nitrogen
38、 for (30 to60) s.NOTE 2The specimens can be prepared up to one week in advanceand stored in heptane until needed for testing.8.2 Test Tube Assembly, Tube Rack, and Shaker for EachTest Tube:8.2.1 Cut 24 separate pieces of TFE-fluorocarbon FEPtubing, each piece to be 240 mm long.8.2.1.1 Use compressed
39、 air (for technical use only), 345 kPaminimum, to remove most of the water/oil emulsion that maybe trapped inside the short lengths of capillary tubing. Cleanthe tubing with heptane (see 7.1.3), followed by acetone (see7.1.2), and dry with compressed air.8.2.2 Check the flangeless fitting for the TF
40、E-fluorocarbontubing (O.D. 1.6 mm) for deterioration, and replace as neces-sary.8.2.3 Remove and discard the plunger from a new 20 mLdisposable plastic syringe (Luer-Lok), and securely fasten thesyringe barrel to the short capillary tubing, using couplings,14-28 thread, and female Luer CTFE fittings
41、,14-28 thread, andwith a 1.5 mm bore.8.2.3.1 Label the syringes (test tubes) from 1 to 24.8.2.4 Place the assembled test tube in the tube rack with thecapillary tubing facing upward in the adjacent small hole.8.2.4.1 The test tube assembly rack is a specially designedaluminum fabrication. It holds 2
42、4 test tubes with easy snap-onlock, wing nuts, and hold-down bars (see Fig. 5).8.2.5 Place one precleaned specimen into each test tube,using forceps that are 180 mm long, and have serrated tips toavoid contamination.8.2.6 Insert 10 mL of test oil into each test tube, using adisposable syringe with a
43、 capacity of 10 mL.8.2.7 Secure the test tubes to the tube holder with threehold-down bars and three wing nuts.8.2.8 Fasten the test tube assembly rack to the shakerplatform with four custom-made wing bolts.8.3 Acid Delivery System:8.3.1 Withdraw 6 mL of acid solution by hand from awide-mouth beaker
44、 into an individual disposable plastic sy-ringe (Luer-Lok) with a capacity of 5 mL.8.3.1.1 Attach the syringe to an acid inlet port of one of the24 three-way switching valves, with14-28 thread. (The othertwo ports are used for air inlet and mixed air/acid outlet.)8.3.2 Turn the three-way valve to tw
45、o-way open and eject,by hand, about 0.5 mL of acid solution into a waste beaker,while ensuring that no air bubbles remain in the syringe.8.3.2.1 Place the syringe that now contains about 5.5 mL ofacid solution on the holder of the multiple syringes pump.8.3.3 Repeat the above procedure for the other
46、 23 aciddelivery syringes.8.3.4 There are three multiple syringe pumps, and eight ofthe 5 mL syringes are attached to each of the pumps.8.3.4.1 The pumps each have a ten-position rack and arerequired to satisfy a minimum flow rate range of 0.0001 L/hto 220.82 mL/min. Required accuracy is 61 %, and r
47、eproduc-ibility is 6 0.1 %.8.3.5 Ensure that the syringe barrel flange and the plungerflange are firmly held by the six retaining clamps, which are51 mm C-clamps that secure the ends of the hold-down bars ofthe multiple syringes pump.8.3.5.1 Good alignment of all 24 acid delivery syringesagainst the
48、 retaining brackets is crucial to ensure repeatability.(See Fig. 3 for a photograph of the acid delivery system, andFig. 4 for a schematic.)8.3.6 Cut 24 pieces of TFE-fluorocarbon tubing; each pieceto be 1295 6 25.4 mm in length.8.3.6.1 Attach each of these tubes to the mixed air/acidoutlet ports of
49、 the three-way switching valves.8.4 Air Delivery System:8.4.1 Clean, dry air, compressed to at least 345 kPa, isrequired.8.4.2 A single stage, high-purity stainless steel pressureregulator is the first in the line; this is equipped with a (0 to1100) kPa maximum pressure gauge.8.4.3 Two compressed air filters capable of removing par-ticles and mists are required, and are next in the line.11Brooks Model 8744 NRS Flow Controller has been determined to beacceptable for this application. The sole source of supply of the apparatus known tothe committee at
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