ASTM F862-2011 Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids《航空航天液压流体的氯离子浓度及pH值的标准操作规程》.pdf

《ASTM F862-2011 Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids《航空航天液压流体的氯离子浓度及pH值的标准操作规程》.pdf》由会员分享，可在线阅读，更多相关《ASTM F862-2011 Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids《航空航天液压流体的氯离子浓度及pH值的标准操作规程》.pdf（2页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: F862 11Standard Practice forpH and Chloride-ion Concentration of Aerospace HydraulicFluids1This standard is issued under the fixed designation F862; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revi

2、sion. A number in parentheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the measurement of the pH andchloride ion of water extraction of aerospace hydraulic fluids.1.2 The values

3、 stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.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 safet

4、y and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D512 Test Methods for Chloride Ion In WaterD1193 Specification for Reagent WaterE70 Test Method for pH of Aqueous Solutions With theGlass Electrode3. Summary of M

5、ethod3.1 The aerospace hydraulic fluid sample is shaken withwater, and the pH and the quantity of chloride ion aredetermined from the water layer.3.1.1 The pH is measured using a glass electrode and pHmeter.3.1.2 The quantity of the chloride ion is determined using achloride selective ion electrode

6、and a selective ion meter.4. Significance and Use4.1 On application of the hydraulic fluid within the me-chanical fluidic system, the fluid may become contaminatedwith acid and chloride ion. Mechanical shearing of the hydrau-lic fluid in the presence of the minute quantity of water andresidual amoun

7、t of organic solvents, used in cleaning, mayinitiate formation of acid and chloride ion. Measurements aredesired to control and maintain the cleanliness and non-corrosiveness of the fluidic system.5. Apparatus5.1 Combination pH Selective Ion Meter,5.2 Glass ElectrodeThe pH response shall be 60.05 pH

8、.5.3 Reference ElectrodeA calomel, silver/silver chloride,or other reference electrode of constant potential.5.4 Chloride Selective Ion Electrode.5.5 Double Junction Reference Electrode, sleeve-type5.6 Separatory Funnel, 250 mL.6. Reagents6.1 Water, reagent grade, Type IV, in accordance withSpecific

9、ation D1193.6.2 Reference Buffer Solutions, SRM/RM 185, 186,and 187Materials supplied by the National Institute of Stan-dards and Technology with pH values.7. Standardization of pH Meter7.1 Standardize the pH meter in accordance with TestMethod E70.PART ApH MEASUREMENT8. Procedure8.1 Add a 50-mL sam

10、ple of hydraulic fluid and 50 mL ofreagent water to a 250-mL separatory funnel.8.2 Mix thoroughly. Allow for the water and oil layers toseparate completely.8.3 Drain the water layer from the funnel into a 100-mLbeaker.8.4 Standardize the pH-meter assembly with two referencebuffer solutions as descri

11、bed in section 7.1. Wash the electrodeswith three changes of water. Equip the beaker with a smalllaboratory-type mechanical stirrer having a glass agitator orwith a magnetic stirring unit having an inert, plastic-covered1This practice is under the jurisdiction of ASTM Committee F07 on Aerospaceand A

12、ircraft and is the direct responsibility of Subcommittee F07.07 on Qualifica-tion Testing of Aircraft Cleaning Materials.Current edition approved Dec. 1, 2011. Published January 2012. Originallyapproved in 1984. Last previous edition approved in 2002 as F862 93 (2002)which was withdrawn January 2011

13、 and reinstated in December 2011. DOI:10.1520/F0862-11.2For 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.1Copyr

14、ight ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.impeller. Insert the electrodes and determine the pH value;measure the water sample until two readings 30 s apart do notdiffer by more than 0.05-pH unit. Record the pH values.9. Calculation9.

15、1 The pH of the sample is the average of the last tworeadings.10. Report10.1 Report the pH of the water extraction of hydraulic fluidto the nearest 0.1 unit.11. Precision and Bias11.1 See Test Method E70 for Precision and Bias informa-tion.PART BCHLORIDE-ION CONCENTRATIONMEASUREMENT12. Procedure12.1

16、 Add a 100-mLsample of hydraulic fluid and 100 mLofreagent water to a 250-mL separatory funnel.12.2 Mix thoroughly. Allow for the water and oil layers toseparate completely.12.3 Drain the water layer from the funnel into a 250-mLbeaker.12.4 Prepare a calibration curve and determine the chlorideion c

17、oncentration on the water layer in accordance with D512Test Method C.13. Calculation13.1 Read the chloride ion concentration directly from thecalibration curve prepared in section 12.4.14. Report14.1 Report the chloride-ion concentration to the nearestwhole integer.15. Precision and Bias15.1 See D51

18、2 for Precision and Bias information.16. Keywords16.1 chloride ion; hydraulic fluid; pHASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of

19、the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Y

20、our comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your commen

21、ts have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or mu

22、ltiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).F862 112