ASTM D2619-1995(2002)e1 Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)《液压液水解稳定性的标准试验方法(酒瓶法)》.pdf
《ASTM D2619-1995(2002)e1 Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)《液压液水解稳定性的标准试验方法(酒瓶法)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2619-1995(2002)e1 Standard Test Method for Hydrolytic Stability of Hydraulic Fluids (Beverage Bottle Method)《液压液水解稳定性的标准试验方法(酒瓶法)》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 2619 95 (Reapproved 2002)e1An American National StandardStandard Test Method forHydrolytic Stability of Hydraulic Fluids (Beverage BottleMethod)1This standard is issued under the fixed designation D 2619; the number immediately following the designation indicates the year oforiginal a
2、doption or, in the case of revision, the 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.e1NOTEWarning notes were placed in the text editorially in May 2002.1. Scope1.1
3、This test method2covers the determination of thehydrolytic stability of petroleum or synthetic-base hydraulicfluids.NOTE 1Water-base or water-emulsion fluids can be evaluated by thistest method but are run “as is.” Additional water is not added to the 100-gsample.1.2 The values stated in SI units ar
4、e to be regarded as thestandard. The inch-pound units given in parentheses areprovided for information only.1.3 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 appro-priate safety
5、and health practices and determine the applica-bility of regulatory limitations prior to use. Specific hazardstatements are given in 3.1, 6.1, 6.3, 6.4, and Annex A1.2. Referenced Documents2.1 ASTM Standards:D 445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids (and the Calculat
6、ion of DynamicViscosity)3D 974 Test Method for Acid and Base Number by Color-Indicator Titration33. Summary of Test Method3.1 The sample of 75 g of fluid plus 25 g of water and acopper test specimen are sealed in a pressure-type beveragebottle. The bottle is rotated, end for end, for 48 h in an oven
7、 at93C (200F). Layers are separated, and insolubles areweighed. Weight change of copper is measured. Viscosity andacid number changes of fluid and acidity of water layer aredetermined. (WarningIn addition to other precautions, be-cause this test method involves the use of a glass bottle thatmay cont
8、ain approximately 200 kPa (2 atm) of air and watervapor at temperatures up to 93C, a full face shield and heavywoven fabric gloves should be worn when handling or workingwith the heated and sealed sample container.)4. Significance and Use4.1 This method differentiates the relative stability of hy-dr
9、aulic fluids in the presence of water under the conditions ofthe test. Hydrolytically unstable hydraulic fluids form acidicand insoluble contaminants which can cause hydraulic systemmalfunctions due to corrosion, valve sticking, or change inviscosity of the fluid. The degree of correlation between t
10、histest and service performance has not been fully determined.5. Apparatus5.1 Air Oven, convection, adjusted to 93 6 0.5C (200 61F).45.2 Pressure-Type Beverage Bottles,5200 mL (7-oz).5.3 Capping Press, for bottles.5.4 Rotating Mechanism, for holding bottles and rotatingend over end at 5 rpm in oven.
11、5.5 Centrifuge, 1500 rpm.5.6 Centrifuge Tubes, cone-shaped, 100-mL.5.7 Filtration Assembly,6stainless screen/glass, membranetype 47-mm diameter.5.8 Typewriter Brush.5.9 Separatory Funnel, 125-mL.5.10 Microscope, for 203 magnification.5.11 Balance, sensitive to 0.2 mg.5.12 Caps, for sealing bottles.1
12、This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.N0.08 on Thermal Stability.Current edition approved Jan. 15, 1995. Published March 1995. Originallypublished as D 2619 67. Last previous edition D
13、2619 88 (1994)e1.2This test method is a modification of Federal Test Method Standard No. 791a,Method 3457 for Hydrolytic Stability.3Annual Book of ASTM Standards, Vol 05.01.4An acceptable commercial unit is available from Falex Corp. 1020 Airpark Dr.,Sugar Grove, IL 60554.5A 200-mL (7-oz) glass Coca
14、 Cola trademarked bottle has proven satisfactory.Bottles can be obtained from beverage distributors.6A Millipore XX10 047 30 or equivalent has proven satisfactory.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.13 Inert Seal,7for c
15、ap gasket.5.14 Membrane Type Filter,8cellulosic, 5-m porosity,47-mm diameter.6. Reagents and Materials6.1 n-Heptane.(WarningFlammable, harmful if inhaled,skin irritant on repeated contact, aspiration hazard; see A1.1.)6.2 Phenolphthalein, 1 % alcoholic solution.6.3 Potassium Hydroxide (KOH), 0.1 N a
16、queous solutionstandardized to within 0.0005 N.(WarningCaustic.)6.4 1,1,1-Trichloroethane.(WarningHarmful if inhaled,high concentrations may cause unconsciousness or death;contact may cause skin irritations and dermatitis, may producetoxic vapors if burned, eye irritant; see A1.2.)6.5 Copper Strip (
17、QQ-C-576A), 16-22 B and S gage, 13 by51 mm.6.6 Steel Wool, grade 1-medium fine.6.7 Litmus Paper.7. Procedure7.1 Fill the pressure beverage bottle with distilled water andallow to stand overnight. Drain and rinse, with distilled water,but do not dry.7.2 Weigh 75 g of test fluid and 25 g of distilled
18、water to 0.5g into the beverage bottle.7.3 Polish the copper test specimen to a clean surface withthe steel wool and wash with n-heptane. (Warningsee 6.1).Dry and weigh to 0.2 mg. Immediately immerse the copperspecimen in the test fluids in the beverage bottle. Avoidspecimen contact by handling the
19、cleaned copper test strip withcotton gloves or filter paper.7.4 Prepare a disk of the inert seal6and place in a new bottlecap. Seal the bottle using the cap with the gasket.7.5 Place the bottle in the rotating mechanism in the ovenadjusted to 93 6 0.5C (200 6 1F). Allow to rotate, end forend, at 5 r
20、pm for 48 h.7.6 Remove the bottle and place on an insulated surfaceuntil cool.7.7 Open the bottle, empty the contents into a 100-mL,cone-shaped centrifuge tube, and centrifuge for 10 min at 1500rpm. Decant the separated water and emulsion layers and setaside. (A pipet can be used as an alternative m
21、ethod to removethe water layer without centrifuging, provided a clear waterseparation results by sample settling.)7.8 Filter the fluid oil layer through a membrane filterweighed to 0.2 mg. Transfer the fluid layer to a 125-mLseparatory funnel. Rinse the filter flask with 25 mL of distilledwater and
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