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ASTM D7934/D7934M-14

(Test Method)

Standard Test Method for Corrosion of Cast Aluminum Alloys in Non-Aqueous Engine Coolants Under Heat-Rejecting Conditions (Withdrawn 2023)

Standard Test Method for Corrosion of Cast Aluminum Alloys in Non-Aqueous Engine Coolants Under Heat-Rejecting Conditions (Withdrawn 2023)

SIGNIFICANCE AND USE
4.1 It is essential that engine coolants prevent heat-transfer corrosion of aluminum cylinder heads during engine operation. Any corrosion products formed may deposit on interior radiator surfaces, reducing heat-transfer efficiency of the radiator. Overheating and boil-over of the cooling system may then occur.  
4.2 This test method provides a means for selectively screening unused non-aqueous engine coolants and will readily distinguish those coolants that are unsuitable for use with aluminum cylinder head engines. However, satisfactory performance of a coolant in this test method does not ensure adequate long-term service performance. Additional, more comprehensive evaluations with simulated service, dynamometer, and vehicle tests should be used to establish the long-term effectiveness of the coolant.
SCOPE
1.1 This test method covers a laboratory screening procedure for evaluating the effectiveness of non-aqueous engine coolants in combating corrosion of aluminum casting alloys under heat-transfer conditions that may be present in aluminum cylinder head engines.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Some values have only SI units because the inch-pound equivalents are not used in practice.  
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. Some specific hazards statements are given in Sections 11 and 12.
WITHDRAWN RATIONALE
This test method covers a laboratory screening procedure for evaluating the effectiveness of non-aqueous engine coolants in combating corrosion of aluminum casting alloys under heat-transfer conditions that may be present in aluminum cylinder head engines.
Formerly under the jurisdiction of Committee D15 on Engine Coolants and Related Fluids, this test method was withdrawn in January 2023 in accordance with Section 10.6.3 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

Status
Withdrawn
Publication Date
31-May-2014
Withdrawal Date
08-Jan-2023
ICS
71.100.45 - Refrigerants and antifreezes
Technical Committee
D15 - Engine Coolants and Related Fluids
Drafting Committee
D15.22 - Non-Aqueous Coolants
Current Stage
Ref Project

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ASTM D7934/D7934M-14 - Standard Test Method for Corrosion of Cast Aluminum Alloys in Non-Aqueous Engine Coolants Under Heat-Rejecting Conditions (Withdrawn 2023)ASTM D7934/D7934M-14 - Standard Test Method for Corrosion of Cast Aluminum Alloys in Non-Aqueous Engine Coolants Under Heat-Rejecting Conditions (Withdrawn 2023)
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ASTM D7934/D7934M-14 - Standard Test Method for Corrosion of Cast Aluminum Alloys in Non-Aqueous Engine Coolants Under Heat-Rejecting Conditions (Withdrawn 2023)
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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: D7934/D7934M − 14
Standard Test Method for
Corrosion of Cast Aluminum Alloys in Non-Aqueous Engine
1
Coolants Under Heat-Rejecting Conditions
This standard is issued under the fixed designation D7934/D7934M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope continued for 1 week (168 h). Effectiveness of the coolant for
preventing corrosion of the aluminum under heat-transfer
1.1 This test method covers a laboratory screening proce-
conditions (hereafter referred to as heat-transfer corrosion) is
dure for evaluating the effectiveness of non-aqueous engine
evaluated on the basis of the weight change of the test
coolants in combating corrosion of aluminum casting alloys
specimen.
underheat-transferconditionsthatmaybepresentinaluminum
cylinder head engines.
4. Significance and Use
1.2 The values stated in either SI units or inch-pound units
4.1 It is essential that engine coolants prevent heat-transfer
are to be regarded separately as standard. The values stated in
corrosionofaluminumcylinderheadsduringengineoperation.
each system may not be exact equivalents; therefore, each
Any corrosion products formed may deposit on interior radia-
system shall be used independently of the other. Combining
tor surfaces, reducing heat-transfer efficiency of the radiator.
values from the two systems may result in non-conformance
Overheating and boil-over of the cooling system may then
with the standard. Some values have only SI units because the
occur.
inch-pound equivalents are not used in practice.
4.2 This test method provides a means for selectively
1.3 This standard does not purport to address all of the
screeningunusednon-aqueousenginecoolantsandwillreadily
safety concerns, if any, associated with its use. It is the
distinguish those coolants that are unsuitable for use with
responsibility of the user of this standard to establish appro-
aluminumcylinderheadengines.However,satisfactoryperfor-
priate safety and health practices and determine the applica-
manceofacoolantinthistestmethoddoesnotensureadequate
bility of regulatory limitations prior to use. Some specific
long-term service performance. Additional, more comprehen-
hazards statements are given in Sections 11 and 12.
sive evaluations with simulated service, dynamometer, and
2. Referenced Documents vehicle tests should be used to establish the long-term effec-
2
tiveness of the coolant.
2.1 ASTM Standards:
D1176Practice for Sampling and Preparing Aqueous Solu-
5. Apparatus
tionsofEngineCoolantsorAntirustsforTestingPurposes
D4340Test Method for Corrosion of CastAluminumAlloys
5.1 Heat-Transfer Corrosion Cell—The assembled corro-
in Engine Coolants Under Heat-Rejecting Conditions
sioncell isshownschematicallyinFig. 1. It isassembledfrom
components, some of which require glass blowing or machin-
3. Summary of Test Method
ing. The glass O-ring cell shall be constructed from two glass
3
3.1 In this test method, a heat flux is established through a
O-ring joints joined to an additional middle section of glass
4
cast aluminum alloy typical of that used for engine cylinder tubing of the same diameter to make a total length of 53 cm
5
heads while exposed to a non-aqueous engine coolant under a
[21in.].Heat-resistantO-rings shallbeused.Internalpressure
pressureof34.5kPa[5psig].Thetemperatureofthealuminum shall be monitored using a suitable pressure gage, and a
specimen is maintained at 149°C [300°F] and the test is
pressure-relief valve shall be installed to protect against
bursting.
5.1.1 The top assembly plate (shown in Fig. 2) shall be
1
This test method is under the jurisdiction ofASTM Committee D15 on Engine
constructed of stainless steel, and the heat-transfer bar and
Coolants and Related Fluids and is the direct responsibility of Subcommittee
D15.22 on Non-Aqueous Coolants.
Current edition approved June 1, 2014. Published September 2014. DOI:
10.1520/D7934_D7934M–14
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or O-ring joints with a low coefficient of expansion may be used.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM High-strength glass with a low coefficient of expansion may be used.
5
Standards volume information, refer to the standard’s Document Summary page on Silicone O-rings may also be satisfactory. Polytetrafluoroethylene is not
the ASTM website. suitable due to a high creep rate at the test temperature.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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This test method establishes the standard procedures for the determination of the equilibrium boiling point of engine coolants. The equilibrium boiling point indicates the temperature at which the sample will start to boil in a cooling system under equilibrium conditions at atmospheric pressure. This method requires the use of the following apparatuses: round-bottom, short-neck, heat-resistant glass flask; water-cooled, reflux, glass-tube type condenser; grit No. 8 boiling stones of silicon carbide grains; partial immersion thermometer; and electric heating mantle as heat source. Specified amounts of the sample shall be boiled under equilibrium conditions at atmospheric pressure in the flask. The temperature of the liquid corrected for barometric pressure shall be the boiling point.
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5.1 The total apparent water in engine coolant concentrate as determined by Karl Fischer titrations consists of the following: (1) water present in the original glycol base; (2) water added (for example, inhibitor solutions); (3) water of hydration of inhibitors (for example, Na2B4O7·5H2O); (4) water formed in the chemical reaction between borate and ethylene glycol, producing boratediol condensate and water; and (5) quantitative interference by the reaction of the reagent with inhibitors such as tetraborate or sodium hydroxide.
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1.1 These test methods cover the determination of the water present in new or unused glycol-based coolant concentrates using a volumetric (Test Method A) or an automatic coulometric titrator procedure (Test Method B).  
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1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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Standard Test Method for Relative Density of Engine Coolant Concentrates and Engine Coolants By The Hydrometer

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4.1 The relative density of an engine coolant may be used to determine the approximate percent glycol, freezing point, and boiling point, provided the glycol type is known.  
4.2 The relative density of an engine coolant concentrate can be used as a production control test.  
4.3 ASTM specifications normally state the temperatures for relative density of fluids; 25 °C, 20 °C, and 15.6 °C are commonly used temperatures.
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