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ASTM F482-84(1999)e1

(Test Method)

Standard Test Method for Corrosion of Aircraft Metals by Total Immersion in Maintenance Chemicals

Standard Test Method for Corrosion of Aircraft Metals by Total Immersion in Maintenance Chemicals

SCOPE
1.1 This test method covers the determination of the corrosiveness of tank-type aircraft maintenance chemicals on aircraft metals and the corrodibility of metals in these maintenance chemicals with time. The determination is made under conditions of total immersion by a combination of weight change measurements and visual qualitative determinations of change.  
1.2 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. For specific precautions, see Section 5.

General Information

Status
Historical
Publication Date
31-Dec-1998
ICS
49.025.05 - Ferrous alloys in general
49.025.15 - Non-ferrous alloys in general
Technical Committee
F07 - Aerospace and Aircraft
Drafting Committee
F07.07 - Qualification Testing of Aircraft Cleaning Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM F482-03 - Standard Test Method for Corrosion of Aircraft Metals by Total Immersion in Maintenance Chemicals
Effective Date
10-Apr-2003

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ASTM F482-84(1999)e1 - Standard Test Method for Corrosion of Aircraft Metals by Total Immersion in Maintenance ChemicalsASTM F482-84(1999)e1 - Standard Test Method for Corrosion of Aircraft Metals by Total Immersion in Maintenance Chemicals
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ASTM F482-84(1999)e1 - Standard Test Method for Corrosion of Aircraft Metals by Total Immersion in Maintenance Chemicals
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: F 482 – 84 (Reapproved 1999)
Standard Test Method for
Corrosion of Aircraft Metals by Total Immersion in
Maintenance Chemicals
This standard is issued under the fixed designation F 482; 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 (e) indicates an editorial change since the last revision or reapproval.
e NOTE—Paragraphs 2.1, 4.1.1, and 7.1 were changed editorially and Section 12, Keywords, was added editorially in
September 1999.
1. Scope corrodibility of media and metal (such as passive film forma-
tion or destruction, depletion of corrosive contaminate, and so
1.1 This test method covers the determination of the corro-
forth) as a function of time are not given.
siveness of tank-type aircraft maintenance chemicals on air-
craft metals and the corrodibility of metals in these mainte-
4. Apparatus
nance chemicals with time. The determination is made under
4.1 Wide-Mouth Glass Jar or Flask of suitable sizes (3000
conditions of total immersion by a combination of weight
to 4000 mL), capable of accommodating a reflux condenser, a
change measurements and visual qualitative determinations of
thermometer, and a specimen support system. Fig. 1 shows a
change.
typical arrangement, but any array meeting the provisions of
1.2 This standard does not purport to address all of the
4.2-4.5 will be acceptable.
safety concerns, if any, associated with its use. It is the
4.1.1 If agitation is required, the apparatus should be ca-
responsibility of the user of this standard to establish appro-
pable of accepting a stirring mechanism, such as a magnetic
priate safety and health practices and determine the applica-
stirrer or impeller. The glass jar or flask should be chosen so
bility of regulatory limitations prior to use. For specific
that the specimens will remain fully immersed in a vertical
precautions, see Section 5.
position during the test, and the ratio of area of immersed metal
2. Referenced Documents to volume of solution will be in accordance with 8.1.
4.2 Specimen-Supporting Device—a glass or fluorocarbon
2.1 ASTM Standards:
plastic supporting system designed to keep the specimen fully
D 235 Specification for Mineral Spirits (Petroleum Spirits)
immersed while assuring free contact with the corroding
(Hydrocarbon Dry Cleaning Solvent)
solution, and designed to physically isolate the specimens from
D 1193 Specification for Reagent Water
each other.
E 1 Specification for ASTM Thermometers
4.3 Condenser—a glass reflux condenser of the water-
3. Significance and Use cooled type, having a condenser jacket 200 to 300 mm in
length.
3.1 This test method not only provides information on the
4.4 Constant-Temperature Device—any suitable regulated
accumulated effects of corrosion at specific time periods under
heating device (mantle, hot plate, or bath) may be used for
a given set of conditions, but also provides information on the
maintaining the solution at the required temperature.
initial rate of corrosion of virgin metal, the corrosion rate of
4.5 Thermometer—an ASTM 3-in. (75-mm) immersion
metal per unit time after long exposure, and the initial
thermometer having a range from 0 to 302°F (150°C) and
corrosion rate of virgin metal after long exposure of the
conforming to requirements for Thermometer 1F in accordance
corroding fluid to metal. The test also provides a means of
with Specification E 1.
determining the direction corrosion will take with time, al-
though causes for increase or decrease in the corrosiveness and
5. Safety Precautions
5.1 The solvents used in the cleaning of test specimens are
This test method is under the jurisdiction of ASTM Committee F07 on
flammable and harmful if inhaled. Keep away from sparks and
Aerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 on
open flames. Avoid breathing vapors and prolonged or repeated
Qualification Testing of Aircraft Cleaning Materials.
contact with the skin. Use with adequate ventilation.
Current edition approved Nov. 30, 1984. Published March 1985. Originally
published as F 482 – 77. Last previous edition F 482 – 77. 5.2 The material used for aircraft maintenance may contain
Annual Book of ASTM Standards, Vol 11.01.
Annual Book of ASTM Standards, Vol 14.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
F 482 – 84 (1999)
conforming to Specification D 235. Swab the surface of the
individual specimen thoroughly using clean forceps to hold the
specimen and the cotton swab.
7.2 Shake off the excess solvent. Transfer and immerse the
test specimens separately several times in a beaker of methyl
ethyl ketone.
7.3 Shake off excess methyl ethyl ketone and dry in a
vacuum desiccator or in a low temperature oven at 100 6 5°F
(37.7 6 3°C) for 15 min.
8. Conditioning
8.1 Volume of Solution—The volume of solution shall be
500 mL per specimen. Use fresh solution for each set of
replicates.
8.2 Solution Concentration:
8.2.1 Unless otherwise specified, test the specimens in
solutions of the maintenance chemical in the concentrated
as-received condition and at the recommended dilution using
distilled or deionized water conforming to Specification
D 1193, Type IV. (For solid materials, concentrated condition
shall mean in a saturated solution of the solid material.) In case
the material is not soluble to the extent noted, record this fact
and continue with the test.
8.2.2 Test diphase materials with an appropriate amount of
each phase loaded into the test vessel to simulate use condi-
tions. Totally immerse the corrosion specimens in the working
phase of the maintenance chemical.
8.2.3 If water is not used as the diluent, record the type and
specification of diluent used in the test.
8.3 Temperature—Unless otherwise specified, the tempera-
ture shall be 100 6 2°F (37.7 6 3°C).
8.4 Test Duration—Total test duration shall be 168 h, with
specimens being added or removed at intermediate intervals.
A = Condenser
B = Stirring mechanism
8.5 If the maintenance chemical is to be used with agitation,
C = Containing vessel
also test the specimens with appropriate agitation to simulate
D = Specimen holder
E = Thermometer use conditions.
F = Metal specimen
G = Maintenance chemical solution
9. Procedure
9.1 Weigh four of five specimens (S , S , S , and S )ofthe
NOTE—THIS IS ONE FORM THAT THE EQUIPMENT CAN TAKE, AND IS NOT
1 2 3 4
MANDATORY.ANY ARRAY MEETING THE REQUIREMENTS OF 4.2-4.5 WILL BE
same alloy to the nearest 0.1 mg. Record the weights S W ,
1 1
ACCEPTABLE.
S W , S W , S W . Retain the fifth specimen of each alloy for
2 1 3 1 4 1
FIG. 1 Test Apparatus
comparison purposes.
9.2 Immerse three of the specimens (S , S , and S )inthe
1 2 3
flammable solvents, acids, or alkalis, or other toxic com- test solution using only specimens of the same alloy in the
pounds. Take suitable precautions to prevent personnel injury. containing vessel. Retain S for use in accordance with 9.5.
9.3 At the end of 48-h exposure time, remove S and
6. Test Specimens
proceed as follows:
6.1 The test specimens of a given alloy shall be taken from
9.3.1 Rinse thoroughly under hot tap water, 120 to 140°F
the same sheet stock and shall measure 2 by 1 by 0.06 in. (50.8 (49 to 60°C), while scrubbing with a stiff bristle brush. Follow
by 25.4 by 1.6 mm) with a 0.125-in. (3.2-mm) diameter
with distilled or deionized water conforming to Specification
mounting hole and suitably located at one end of the specimen. D 1193, Type IV at room temperature.
At least two and preferably three replicates should be tested in 9.3.2 Rinse with a stream of acetone from a wash bottle and
each concentration of maintenance chemical solution in accor- dry.
dance with 8.2. The total area of the specimen shall be taken as 9.3.3 If corrosion deposits are still adhered, remove corro-
2 2
4.4 in. (28.2 cm ). sion products in accordance with Annex A1 and Annex A2 and
rinse dry in accordance with 9.3.1 and 9.3.2.
7. Test Specimen
9.3.4 Weigh to the nearest 0.1 mg and record as S W .Ifthe
1 2
7.1 Preheat the test specimens to 150 6 5°F (60 6 2°C) and specimen has been treated in accordance with Annex A1 and
immerse in a beaker containing Mineral Spirits, Type II, Annex A2, subtract any weight losses of the control specimen
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
F 482 – 84 (1999)
of Annex A1 and Annex A2 from the weight loss of the 10.1.1 Name and type of maintenance chemical tested.
specimen. 10.1.2 Concentrations, diluent used, and other conditions of
9.3.5 Calculate the weight loss of the panel as WL. test peculiar to maintenance chemical type.
S = S W − S W . 10.1.3 Alloy type, surface treatment and condition, and
1 1 1 1 2
9.4 At
...

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1.2.1 Because of thermal instability, Grades CE20N, CF3A, CF3MA, and CF8A are not recommended for service at temperatures above 800 °F [425 °C].  
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    sale 15% off
  • Technical specification
    7 pages
    English language
    sale 15% off