Standard Test Method for Engine Coolant Stagnation in Flux-Brazed Aluminum Heat Exchangers

SIGNIFICANCE AND USE
4.1 Automobile and truck radiators and heater cores are now predominantly made with aluminum alloys using various manufacturing processes including brazing with a flux (See Appendix X1 for additional information). The presence of residual internal brazing flux in heat exchangers along with the high ratio of internal aluminum surface area to coolant volume may affect certain physical and chemical properties and corrosion protection of the coolant. This test method provides a screening test to assess engine coolant physical and chemical properties and corrosion protection after aging it in a heat exchanger brazed with flux at elevated temperature under stagnant conditions. This method cannot stand alone as evidence of satisfactory coolant performance in flux-brazed aluminum heat exchangers. The actual service of an engine coolant formulation can be determined only by more comprehensive bench, dynamometer, and field tests.
SCOPE
1.1 This test method covers a laboratory screening procedure for evaluating engine coolant compatibility and corrosion protection after aging two weeks at 90°C in an aluminum heat exchanger brazed using flux.  
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.

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Publication Date
30-Apr-2015
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ASTM D7933-15 - Standard Test Method for Engine Coolant Stagnation in Flux-Brazed Aluminum Heat Exchangers
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Designation: D7933 − 15
Standard Test Method for
Engine Coolant Stagnation in Flux-Brazed Aluminum Heat
1
Exchangers
This standard is issued under the fixed designation D7933; 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 tional properties, and engine coolant aluminum corrosion
protection is based on performance in the Test Method D4340
1.1 This test method covers a laboratory screening proce-
test.
dure for evaluating engine coolant compatibility and corrosion
protection after aging two weeks at 90°C in an aluminum heat
4. Significance and Use
exchanger brazed using flux.
4.1 Automobileandtruckradiatorsandheatercoresarenow
1.2 The values stated in SI units are to be regarded as
predominantly made with aluminum alloys using various
standard. No other units of measurement are included in this
manufacturing processes including brazing with a flux (See
standard.
Appendix X1 for additional information). The presence of
1.3 This standard does not purport to address all of the residual internal brazing flux in heat exchangers along with the
safety concerns, if any, associated with its use. It is the
high ratio of internal aluminum surface area to coolant volume
responsibility of the user of this standard to establish appro- may affect certain physical and chemical properties and corro-
priate safety and health practices and determine the applica-
sion protection of the coolant. This test method provides a
bility of regulatory limitations prior to use. screening test to assess engine coolant physical and chemical
properties and corrosion protection after aging it in a heat
2. Referenced Documents
exchanger brazed with flux at elevated temperature under
2
2.1 ASTM Standards: stagnant conditions. This method cannot stand alone as evi-
D1176 Practice for Sampling and Preparing Aqueous Solu- dence of satisfactory coolant performance in flux-brazed alu-
tions of Engine Coolants orAntirusts forTesting Purposes minum heat exchangers. The actual service of an engine
D1193 Specification for Reagent Water coolant formulation can be determined only by more compre-
D4340 Test Method for Corrosion of CastAluminumAlloys
hensive bench, dynamometer, and field tests.
in Engine Coolants Under Heat-Rejecting Conditions
5. Apparatus
E230/E230M Specification and Temperature-Electromotive
Force (emf) Tables for Standardized Thermocouples 5.1 Aluminum Heat Exchanger Brazed with Flux—The heat
exchanger may be a radiator, heater core, or other, liquid
3. Summary of Test Method
cooled heat exchanger.
3.1 An aluminum heat exchanger that was brazed using flux
NOTE 1—The aluminum brazed heat exchangers used in this test
via any application method or as part of the material cladding
method may be commercially produced or experimentally prepared by the
isfilledwithenginecoolant,plugged,andplacedinanovenfor heat exchanger supplier. The aluminum grade, alloying, flux loading
during brazing, and residual flux remaining in the heat exchanger after
two weeks (336 h) at 90°C. Engine coolant compatibility is
brazing may vary from part to part. The heat exchanger type,
assessed based on changes in coolant physical and composi-
manufacturer, size, and other design parameters are decided by mutual
agreement of the parties involved.
1
This test method is under the jurisdiction ofASTM Committee D15 on Engine
5.2 Coolant Hoses, Clamps, Hose Adapters, and Caps or
Coolants and Related Fluids and is the direct responsibility of Subcommittee
Plugs—Rubber engine coolant hoses (approximately 15 cm
D15.21 on Extended Life Coolants.
length) of appropriate diameter shall be fitted onto heat
Current edition approved May 1, 2015. Published May 2015. DOI: 10.1520/
D7933-15
exchanger inlet/outlets to allow for coolant expansion. EPDM
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
is one type hose material suitable for the test. Metal clamps,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
hose adapters, and threaded caps or plugs (stainless steel, or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. steel) shall be used to seal the heat exchanger during the
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D7933 − 15
stagnation test. All materials used in the preparation and during aging in the oven. An example of an assembled heat
plumbing of the test specimen shall not be galvanic to the exchanger with hoses, clamps, and caps is shown in t
...

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