1、Designation: D5969 11Standard Test Method forCorrosion-Preventive Properties of Lubricating Greases inPresence of Dilute Synthetic Sea Water Environments1This standard is issued under the fixed designation D5969; the number immediately following the designation indicates the year oforiginal adoption
2、 or, in the case of revision, the year 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. Scope*1.1 This test method covers the determination of thecorrosion-preventive proper
3、ties of greases using grease-lubricated tapered roller bearings exposed to various concen-trations of dilute synthetic sea water stored under wet condi-tions. It is based on Test Method D1743, which is practicedusing a similar procedure and distilled water. The reportedresult is a pass or fail ratin
4、g as determined by at least two ofthree bearings.1.2 Apparatus DimensionsThe values stated in inch-pound units are to be regarded as standard. The values given inparentheses are mathematical conversions to SI units that areprovided for information only and are not considered standard.1.3 All Other V
5、aluesThe values stated in SI units are to beregarded as standard. No other units of measurement areincluded in this standard.1.4 This standard does 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 app
6、ro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D665 Test Method for Rust-Preventing Characteristics ofInhibited Mineral Oil in the Presence of WaterD1193 Specification for Reagent WaterD1743 Tes
7、t Method for Determining Corrosion PreventiveProperties of Lubricating Greases3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 corrosionthe chemical or electrochemical reactionbetween a material, usually a metal, and its environment thatproduces a deterioration of the material
8、and its properties.3.1.1.1 DiscussionIn this test method, corrosion is mani-fested by red rust or black stains on the bearing race. Stains,through which the underlying metal surface is still visible, arenot considered corrosion in Test Method D5969 and shall beignored. D17434. Summary of Test Method
9、4.1 New, cleaned, and lubricated bearings are run under alight thrust load for 60 6 3 s to distribute the lubricant in apattern that might be found in service. The bearings areexposed to a solution of synthetic sea water at some percentagein distilled water, then stored for 24 612 hat526 1C and100 %
10、 relative humidity. After cleaning, the bearing cups areexamined for evidence of corrosion.5. Significance and Use5.1 This test method differentiates the relative corrosion-preventive capabilities of lubricating greases under the testconditions.6. Apparatus6.1 Bearings, Timken bearing cone and rolle
11、r assemblyLM11949 and cup LM11910.36.2 Motor, 1750-rpm (approximate) speed,115 hp (min).6.3 Bearing Holder, (see Fig. 1) consists of a 1 6 0.01-kgmass, upper and lower plastic collars for the bearing cone(Parts A and B), a metal screw, and a plastic collar for the cup(Part C).6.4 Plastic Test Jar, a
12、s shown in Fig. 2.6.5 Run-in Stand,4as shown in Fig. 3.6.6 Spindle/Thrust Loading Device,3as shown in Fig. 4.6.7 Mechanical Grease Packer, as shown in Fig. 5.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of Subc
13、ommitteeD02.G0.06 on Functional Tests - Contamination.Current edition approved May 1, 2011. Published May 2011. Originallyapproved in 1996. Last previous edition approved in 2008 as D596908. DOI:10.1520/D5969-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Cus
14、tomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Manufactured by the Timken Co., Canton, OH 44706.4The sole source of supply of the apparatus known to the committee at this timeis Falex Corp., 1020
15、 Airpark Drive, Sugar Grove, IL, 60554. If you are aware ofalternative suppliers, please provide this information to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.1*A Summary of Changes sectio
16、n appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.8 Pliers,5as shown in Fig. 6.6.9 Syringe, of at least 100 6 5 mL volume and with aneedle of at least 16 gauge and a minimum length of 100 mm(4 in.
17、).6.10 Timer, capable of measuring a 60 6 3-s interval.6.11 Oven, a laboratory oven, essentially free of vibration,capable of maintaining 52 6 1C.7. Reagents7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conf
18、orm to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,5AWaldes Truarc Plier No. 4, available from Truarc Co., or similar, modified asin Fig. 6.KEY DESCRIPTION QUANTITY1 PISTON 12 O RING 13 WEIGHT 14 UPPER FLANGE 15 LOWER FLANGE 1614 203 1-14 FILLISTER HD
19、. MACH. SCREW S.S. 17 O RING 18 BEARING HOLDER 19 PLASTIC JAR 110 O RING 1FIG. 1 Test Method D1743 Bearing Holder AssemblyD5969 112where such specifications are available.6Other grades may beused, provided that it is first ascertained that the reagent is ofsufficiently high purity to permit its use
20、without lessening theaccuracy of the determination.7.2 Purity of WaterUnless otherwise indicated, referencesto water shall be understood to mean reagent water conformingto Specification D1193, Type III.7.3 Isopropyl Alcohol.(WarningFlammable.)7.4 Solvent Rinse Solution, of the following composition
21、byvolume:7.4.1 Isopropyl Alcohol,90%,7.4.2 Distilled Water, 9 %, and7.4.3 Ammonium Hydroxide,1%.(WarningPoison.Causes burns. Vapor extremely irritating. May be fatal ifswallowed. Harmful if inhaled.)7.5 Mineral Spirits, reagent grade, minimum purity.(WarningCombustible. Vapor harmful.)7.6 Synthetic
22、Sea Water, prepared as described in TestMethod D665.(WarningPoison. May be fatal if swal-lowed.)8. Standardization of Thrust Loading Device8.1 Pack a bearing, and install it into the holder. Place theassembly into a plastic jar as described in 10.1-10.4. Place thejar onto the base of the motor drive
23、 spindle and center it underthe indexing pin of the drive. Lower the drive until the O-ringjust contacts the 1-kg weight. Run the bottom nut of the depthgauge (see Fig. 3) down to the stop. Place a 3-mm spacer ontop of this nut. Bring the top nut down to the spacer. Whileholding the top nut in posit
24、ion, remove the spacer and run thebottom nut up and tighten it against the top nut. When theO-ring is compressed against the 1-kg weight until the adjust-ment nut hits the stop, there will be a 29-N load added, givinga total load of 39 N on the bearing. (The loads described areprovided by the forces
25、 of the spring in the thrust loadingspindle and the sum of the 1-kg weight and spring, respec-tively. These loads are approximate. The 1-kg weights shouldbe within 0.010 kg of their stated values. The thrust loadingspindle should be calibrated by some suitable method when itis first put into service
26、, recalibrated periodically, and replacedif its spring does not provide sufficient force to spin the testbearings without slippage during the 60-s run to distribute thegrease.) Examine the O-ring periodically, and replace it if itshows any cracks or other signs of deterioration.8.2 The thrust loadin
27、g device should be standardized beforeuse, once per day if used daily, and again if there is reason tobelieve that the standardization has changed. The thrust load-ing device may be standardized using one of the greases to betested.9. Preparation of Bearings9.1 Examine the test bearings carefully an
28、d select onlybearings that have outer races (cups) and rollers entirely free ofcorrosion. During the bearing preparation, handle the bearingswith tongs or rubber or plastic gloves. Do not touch bearingswith the fingers at any time.9.2 Wash the selected bearings thoroughly in hot (52 to66C) mineral s
29、pirits, reagent grade (Warningsee 7.5)toremove the rust preventive. To ensure complete removal of therust preventive, subject the bearings to a second wash in freshhot mineral spirits, reagent grade.NOTE 1The washing temperatures specified are considerably abovethe flash point of the solvent. Accord
30、ingly, the washing operation shouldbe carried out in a well-ventilated hood where no flames or other ignitionsources are present.9.3 Transfer the bearing from the mineral spirits, reagentgrade to the solvent rinse solution (Warningsee 7.4.3)toremove the mineral spirits, reagent grade and any fingerp
31、rintsthat may be present. Then rinse the bearing and slowly rotateit in fresh hot (66 6 5C) solvent rinse solution.NOTE 2Fresh solvent rinse solution must be used to avoid selectiveevaporation of the components at the rinse temperature.9.4 Remove the bearing from the solvent rinse solution andplace
32、it on filter paper to drain. After draining, dry the bearingin an oven at 70 6 5C for 15 to 30 min.9.5 Permit the bearing to cool to room temperature andreexamine its surfaces to ensure that corrosion-free and free-turning specimens have been selected. (Take care not to spinthe bearings after cleani
33、ng and drying.)9.6 Wash and dry the bearing packer using the sametechnique as for the preparation of the bearings.6Reagent Chemicals, American Chemical Society Specifications, AmericanChemical Society, Washington, DC. For Suggestions on the testing of reagents notlisted by the American Chemical Soci
34、ety, see Annual Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.Test Jar SpecificationsInner Diameter Range: 3.113.31 in. (7984 mm)Inner Height Range: 3.54.0 in. (8910
35、2 mm)FIG. 2 Plastic Test JarD5969 11310. Procedure10.1 With the reservoir of the grease packer resting on aclean bench top, and while wearing gloves, place the bearingcup with the small diameter face down into the recess of thepacker. Place the bearing cone over the cut, and while holdingthe bearing
36、 assembly against the packer, lift and invert thewhole unit and return it to the bench.10.2 Fill the reservoir with the grease sample, and use theplunger to force grease through the bearing. Carefully removethe plunger from the reservoir to avoid sucking air into thebearing, and slide the packer uni
37、t over the edge of the bench.While holding the bearing assembly in the packer, invert theunit to its original position on the bench.10.3 Using a small square-ended spatula, remove excessgrease from the bearing bore and the annulus between thegrease packer and outer perimeter of the bearing cup. Theb
38、earing is removed from the packer by either the use of thepliers4or by placing a gloved index finger in the bore andlifting it out.10.3.1 While holding the bearing, use the spatula to removeexcess grease above the cage on both sides of the bearing. Thisprocedure is done to ensure that approximately
39、the samevolume of grease is used each time.10.4 Using Fig. 1 as a guide, hold the packed bearingbetween gloved fingers with the large inside diameter of thecup downward and insert the small diameter plastic flange ontop of the bore, and the larger flange into the bottom of thebore. Slide the bearing
40、 assembly onto the 1-kg weight so thatFIG. 3 Run-in Stand DrawingFIG. 4 Spindle/Thrust Loading DeviceD5969 114the large diameter flange fits into the recess on top of theweight. Insert the bolt through the assembly and screw the bolttightly into the weight. Lower the plastic bearing holder (Part8) o
41、ver the bearing. (The large O-ring faces upward.) Pressdown the holder so that the bearing fits squarely into the holder.10.5 Invert a plastic jar over the bearing assembly. Slide thetwo components over the edge of the bench, and with fingerspressing the weight against the inner bottom of the jar, i
42、nvertthe entire assembly.10.6 Place the jar onto the base of the motor-driven spindleand center under the indexing pin of the drive. After the pin isengaged, start the motor and bring the drive into the center ofthe 1-kg weight. Load until the nut hits the depth stop. Run for60 6 3 s and allow the b
43、earing to coast to a stop. Hold it withtwo fingers and then raise the drive. Take extreme care not tobreak the contact between the races and rollers at this point andin the following steps.NOTE 3At no time during or after the 60-s run shall the grease beredistributed or forced back into the bearing.
44、10.7 Using synthetic sea water (Warningsee 7.6) pre-pared as in Test Method D665, make a dilution with distilledwater (by volume, at the desired concentration) to obtain theproper test solution. The synthetic sea water should be no morethan one week old.10.8 Fill a clean syringe with 100 6 5 mL of t
45、he freshlyprepared synthetic sea water test solution. With the run-inbearing in the jar, simultaneously start a timer and begin addingthe synthetic sea water solution into the hole provided for thispurpose in the bearing holder. Add the 100 mL of the solutionwithin 20 6 3 s. When the timer shows 50
46、6 3 s, startwithdrawing the solution. By 60 6 3 s, complete the with-drawal of 70 6 5 mL of the solution. Leave the remaining 306 5 mL of the solution in the jar. Make sure that water does nottouch the bearing after 70 6 5 mL is withdrawn. It may bedifficult to withdraw 70 6 5 mL of water in 10 seco
47、nds usinga 16 gauge needle. A larger needle may be required.10.9 Screw the cap on the jar and transfer to a dark ovenessentially free from vibration for 24 h at 52 6 1C.NOTE 4Test Method D1743 calls for 48 h at 52 6 1C.10.10 Prepare three bearings for each grease sample to betested at the percentage
48、 of dilute synthetic sea water of interest.Each group of three bearings is one test. See Table 1 forconversion.11. Rating Procedure11.1 Remove the bearing from the test jar and place thebearing cup in a 50/50 mixture by volume of isopropyl alcohol(Warningsee 7.3 and 7.5) and mineral spirits, reagent
49、 grade(WarningCombustible. Vapor harmful). The solvent mix-ture can be heated to facilitate the removal of the grease.Agitate vigorously to remove the grease. Repeat the rinsingusing fresh solvent mixture or gently wipe the bearing with aclean cloth or tissue to ensure that traces of grease areremoved.11.2 Transfer the bearing cup from the solvent mixture andallow to dry on clean filter paper.11.3 Examine the cup raceway for evidence of corrosionwithout the use of magnification (Section 5). Use only a pass orfail rating. Criteria for failure sha
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