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ASTM F862-11

(Test Method)

Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids

Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids

SIGNIFICANCE AND USE
On application of the hydraulic fluid within the mechanical fluidic system, the fluid may become contaminated with acid and chloride ion. Mechanical shearing of the hydraulic fluid in the presence of the minute quantity of water and residual amount of organic solvents, used in cleaning, may initiate formation of acid and chloride ion. Measurements are desired to control and maintain the cleanliness and non-corrosiveness of the fluidic system.
SCOPE
1.1 This practice covers the measurement of the pH and chloride ion of water extraction of aerospace hydraulic fluids.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Nov-2011
ICS
49.080 - Aerospace fluid systems and components
Technical Committee
F07 - Aerospace and Aircraft
Drafting Committee
F07.07 - Qualification Testing of Aircraft Cleaning Materials
Current Stage
Ref Project

Relations

Replaces
ASTM F862-93(2002) - Standard Test Method for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids (Withdrawn 2011)
Effective Date
01-Dec-2011

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ASTM F862-11 - Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic FluidsASTM F862-11 - Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids
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ASTM F862-11 - Standard Practice for pH and Chloride-ion Concentration of Aerospace Hydraulic Fluids
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F862 − 11
Standard Practice for
pH and Chloride-ion Concentration of Aerospace Hydraulic
1
Fluids
ThisstandardisissuedunderthefixeddesignationF862;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope with acid and chloride ion. Mechanical shearing of the hydrau-
lic fluid in the presence of the minute quantity of water and
1.1 This practice covers the measurement of the pH and
residual amount of organic solvents, used in cleaning, may
chloride ion of water extraction of aerospace hydraulic fluids.
initiate formation of acid and chloride ion. Measurements are
1.2 The values stated in SI units are to be regarded as
desired to control and maintain the cleanliness and non-
standard. No other units of measurement are included in this
corrosiveness of the fluidic system.
standard.
1.3 This standard does not purport to address all of the 5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Combination pH Selective Ion Meter,
responsibility of the user of this standard to establish appro-
5.2 Glass Electrode—The pH response shall be 60.05 pH.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.3 Reference Electrode—A calomel, silver/silver chloride,
or other reference electrode of constant potential.
2. Referenced Documents
5.4 Chloride Selective Ion Electrode.
2
2.1 ASTM Standards:
5.5 Double Junction Reference Electrode, sleeve-type
D512 Test Methods for Chloride Ion In Water
5.6 Separatory Funnel, 250 mL.
D1193 Specification for Reagent Water
E70 Test Method for pH of Aqueous Solutions With the
6. Reagents
Glass Electrode
6.1 Water, reagent grade, Type IV, in accordance with
3. Summary of Method
Specification D1193.
3.1 The aerospace hydraulic fluid sample is shaken with
6.2 Reference Buffer Solutions, SRM/RM 185, 186,
water, and the pH and the quantity of chloride ion are
and 187—Materials supplied by the National Institute of Stan-
determined from the water layer.
dards and Technology with pH values.
3.1.1 The pH is measured using a glass electrode and pH
meter.
7. Standardization of pH Meter
3.1.2 The quantity of the chloride ion is determined using a
7.1 Standardize the pH meter in accordance with Test
chloride selective ion electrode and a selective ion meter.
Method E70.
4. Significance and Use
PART A—pH MEASUREMENT
4.1 On application of the hydraulic fluid within the me-
chanical fluidic system, the fluid may become contaminated
8. Procedure
8.1 Add a 50-mL sample of hydraulic fluid and 50 mL of
1 reagent water to a 250-mL separatory funnel.
This practice is under the jurisdiction of ASTM Committee F07 on Aerospace
and Aircraft and is the direct responsibility of Subcommittee F07.07 on Qualifica-
8.2 Mix thoroughly. Allow for the water and oil layers to
tion Testing of Aircraft Cleaning Materials.
separate completely.
Current edition approved Dec. 1, 2011. Published January 2012. Originally
approved in 1984. Last previous edition approved in 2002 as F862 – 93 (2002)
8.3 Drain the water layer from the funnel into a 100-mL
which was withdrawn J
...

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