ASTM D2966-77

M1ERICAN NATIONAL ANSI/ ASTM D 2966 - 77 \VITHDRAWN
STANDARD
Standard Test Method for
CAVITATION EROSION-CORROSION
CHARACTERISTICS OF ALUMINUM IN ENGINE
1
COOLANTS USING ULTRASONIC ENERGY
This Standard is issued under the fixed designation D 2966; 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.
1. Scope 4. Significance
1.1 This method covers a laboratory proce­ 4. l This method will generally distinguish
dure for the evaluation of engine coolants to between coolants that provide inadequate
determine their capability to prevent cavita­ protection against cavitation-erosion attack
tion-erosion of aluminum test specimens using and those that are suitable for further evalua­
tion. The results of this test are not sufficient
ultrasonic energy to produce the cavitation.
This is a screening test method, and final evi­ evidence of satisfactory cavitation-erosion in­
dence of satisfactory cavitation erosion pre­ hibition. The service value of a coolant formu­
vention should be confirmed by Method lation can be determined only by more com­
D 2809 and by vehicle tests. prehensive simulated service tests and vehicle
tests.
2. Applicable Documents
S. Apparatus (see Fig. 1)
2.1 ASTM Standards:
B 179 Specification for Aluminum Alloys 5 .1 Ultrasonic Generator, with a minimum
power output of 200 W and a minimum fre­
in Ingot Form for Sand Castings, Perma­
2
nent Mold Castings, and Die Castings quency of 19 kHz.
D 1176 Sampling and Preparing Aqueous 5 .2 Transducer Tank with nominal dimen­
Solutions of Engine Antifreezes or Anti­ sions of 250 by 250 by 250 mm (10 by 10 by
3
rusts for Testing Purposes 10 in.).
D 1384 Corrosion Test for Engine Cool­ 5 .3 Cast Aluminum Specimens conforming
3
ants in Glassware to Alloy SC 64C (Specification B 179, SAE
D 2809 Test for Cavitation Erosion-Cor­ 329) and prepared according to the procedure
rosion Characteristics of Aluminum outlined in Method D 1384. Specimen size,
3
Pumps with Engine Coolants 50 by 25 by 3 mm (2 by 1 by t/s in.).
5.4 Temperature-Regulating Device.
3. Summary of Method
5 .5 Tank Cover-This may be any suitable
3.1 Aluminum specimens are totally im­ material such as plastic or stainless steel plate
mersed in a 15 % coolant solution for 20 hat or aluminum foil.
82 ± 2°C in an ultrasonic tank. The capability 5.6 Separatory Funnel, 3-Iitre.
of coolant to prevent cavitation-erosion is de­
termined by comparing the average weight
1
This method is under the jurisdiction of ASTM Com­
loss incurred by specimens in the test solution
mittee D-15 on Engine Coolants and is the direct responsi­
bility of Subcommittee D 15.09 on Simulated Service
with that of specimens in a reference coolant
Tests.
solution. Each test is run with three aluminum
Current edition approved July 29, 1977. Published
specimens, and the average weight loss is used October 1977. Originally published as D 2966 - 71. Last
previous edition D 2966 - 71 (1977).
to calculate an aluminum cavitation rating be­
'Annual Book of ASTM Standards, Part 7.
tween 1 and 10. • Annual Book of ASTM Standards, Part 30.

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D 2966
5. 7 Support, stainless steel, to hold test turned off before checking the bath temperature
with a thermometer.
specimens, approximately 350 by 40 by 15
1 1
mm (14 by 1 /i by /16 in) (Fig. 2).
7. 7 After 20 h of operation, turn off the
5.8 Brass Rods, three, 6.4 mm(¼ in.) in
power and remove the test specimens, clean
diameter, threaded on each end.
according to the procedures described in
5.9 Nuts and Washers, brass.
Method D 1384, and reweigh.
5 .10 Reference Coolant, consisting of 92 .5
7 .8 Repeat procedure 7 .2 through 7. 7 with
weight % technical grade ethylene glycol, 5 .0
a 15 volume % solution of the test coolant.
weight % distilled water, and 2 .5 weight %
NoTE 2- Reference coolant should be run after
sodium tetraborate decahydrate (Na 8 0 every ten evaluations to assure consistency. When
2 4 7
a laboratory is first setting up this procedure, it is
10H 0).
2
probably advisable to run the reference antifreeze
more frequently.
6. Sampling
6 .1 The antifreeze shall be sampled in ac­ 8. Calculation
cordance with Method D 1176.
8.1 Calculate the Cavitation Numerical
Rating, expressed to the nearest 0.1 unit, as
7. Sampling Procedure
follows:
7 .1 Prepare a 15 volume % solution of the
Rating = 10 - [(T/R) x 9]
reference coolant (5 .10) with distilled water
where:
and heat it to 82 to 85 C.
T = average aluminum specimen weight Joss
7 .2 Transfer the solution to the ultrasonic
with test coolant, and
tank to give a liquid depth of about 150 mm
R = average aluminum specimen weight loss
(6 in.). Maintain the liquid level throughout
with reference coolant.
the 20-h run with the water from the stop­
9. R
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