ASTM E866-00
(Specification)Standard Specification for Corrosion-Inhibiting Adhesive Primer for Aluminum Alloys to Be Adhesively Bonded in Honeycomb Shelter Panels
Standard Specification for Corrosion-Inhibiting Adhesive Primer for Aluminum Alloys to Be Adhesively Bonded in Honeycomb Shelter Panels
SCOPE
1.1 This specification is for sprayable, pigmented liquid primers for use on aluminum alloys that are to be adhesively bonded in the fabrication of honeycomb sandwich panels for tactical shelters. When applied to a properly cleaned surface of aluminum alloy, the primer imparts corrosion resistance and forms a surface suitable for structural bonding using adhesives complying with Specification E865 and for coating with shelter paint finishes.
1.2 The values stated in SI units are to be regarded as the standard where only SI units are given or where SI units are given first followed by inch-pound units; where inch-pound units are given first followed by SI units, the inch-pound units are to be regarded as the standard.
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An American National Standard
Designation: E 866 – 00
Standard Specification for
Corrosion-Inhibiting Adhesive Primer for Aluminum Alloys
to Be Adhesively Bonded in Honeycomb Shelter Panels
This standard is issued under the fixed designation E866; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope QQ-A-250/8d Aluminum Alloy 5052H34, Plate and Sheet
QQ-A-250/11d Aluminum Alloy 6061T6, Plate and Sheet
1.1 This specification is for sprayable, pigmented liquid
primers for use on aluminum alloys that are to be adhesively
3. Materials and Manufacture
bonded in the fabrication of honeycomb sandwich panels for
3.1 The primer shall be a pigmented liquid composed of a
tactical shelters.When applied to a properly cleaned surface of
modified epoxy resin system, compounded so that it can be
aluminum alloy, the primer imparts corrosion resistance and
spray-appliedtoproduceacontinuousuniformcoatingwithout
forms a surface suitable for structural bonding using adhesives
addition of solvent.
complying with Specification E865 and for coating with
shelter paint finishes.
4. Physical Requirements Physical Requirements
1.2 The values stated in SI units are to be regarded as the
4.1 The uncured primer must meet the requirements of
standard where only SI units are given or where SI units are
Table1.ThecuredprimermustmeettherequirementsofTable
given first followed by inch-pound units; where inch-pound
2 and Table 3. These requirements shall be verified by tests
units are given first followed by SI units, the inch-pound units
described in Section 5.
are to be regarded as the standard.
4.2 Properties of Cured Film—When applied and cured in
accordance with 5.1.7, the cured film shall meet the require-
2. Referenced Documents
ments of Table 2 and Table 3 when tested as specified in
2.1 ASTM Standards:
2 5.2-5.3.8.
B117 Practice for Operating Salt Spray (Fog) Apparatus
4.3 Storage Stability—Primer stored in accordance with the
D522 Test Methods for Mandrel Bend Test of Attached
3 manufacturer’s instructions shall meet the requirements of
Organic Coatings
Table1andwhencuredinaccordancewith5.1.7shallmeetthe
D1002 TestMethodforApparentShearStrengthofSingle-
requirementsofTable2andTable3whentestedasspecifiedin
Lap-Joint Adhesively Bonded Metal Specimens by Ten-
4 5.2-5.3.8.
sion Loading (Metal-to-Metal)
4.4 Shelf Life—The shelf life of the primer at 25 6 7°C (77
D3167 Test Method for Floating Roller Peel Resistance of
4 612°F)shallbeatleastfourdays.Afterfourdays,whentested
Adhesives
in accordance with 5.1.4, the primer shall be capable of
E864 Practice for Surface Preparation ofAluminumAlloys
5 meeting all of the requirements of this specification.
to be Adhesively Bonded in Honeycomb Shelter Panels
4.5 Film Thickness—Thefilmthicknessforalltestsshallbe
E865 Specification for Structural FilmAdhesives for Hon-
5 between 0.003 and 0.007 mm (0.0001 and 0.0003 in.).
eycomb Sandwich Panels
E1749 Terminology of Rigid Wall Relocatable Shelters
5. Test Methods
2.2 Federal Specifications:
5.1 Uncured Primer:
5.1.1 Solids Content—Determinethesolidscontentbyheat-
ing a 5 g sample of thoroughly mixed primer in an aluminum
This specification is under the jurisdiction of ASTM Committee E06 on
Performance of Buildings and is the direct responsibility of Subcommittee E06.53
weighing dish in a circulating air oven at 105 6 2°C (221 6
on Materials and Processes for Durable Rigidwall Relocatable Structures.
3°F) for not less than 3 h. Calculate the mass of solids
Current edition approved Oct. 10, 2000. Published January 2001. Originally
published as E866–82. Last previous edition E866–96.
Annual Book of ASTM Standards, Vol 03.02.
Annual Book of ASTM Standards, Vol 06.01.
4 6
Annual Book of ASTM Standards, Vol 15.06. AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Annual Book of ASTM Standards, Vol 04.11. Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E866–00
TABLE 1 Physical Properties of Uncured Liquid Primer
5.1.5 Color—Spray the primer onto an aluminum alloy
Test Requirement panel, leaving a portion of the panel bare. Compare the coated
and uncoated areas visually against the color requirements in
Solids content, % 10 6 1
A
Inhibitor Content,%15 6 3
Table 1.
Color easily visible film
5.1.6 Sprayability—The primer shall be capable of being
Sprayability film is of uniform thickness and color
readily applied in accordance with the manufacturer’s instruc-
A
Based on mass of nonvolatile content.
tions to all test panels of either 6061T6 or 5052H34 aluminum
alloy (Fed. Spec. QQ-A-250/8d or QQ-A-250/11d, respec-
TABLE 2 Physical Properties of Cured Film on Primed Surfaces
tively) and cleaned in accordance with Practice E864 for each
Test Requirement
of the tests described in 5.1.7-5.3.8. Inspect the coating for
Adhesion to metal no cracking or loss of adhesion
uniformity of thickness and color.
Impact resistance no cracking or loss of adhesion (on either side)
5.1.7 Curing Properties—Spraytheprimerontoatestpanel
Pencil hardness 4H minimum
Water resistance no blistering, cracking, softening, or loss of 100 by 150 by 0.05 mm (4 by 6 by 0.020 in.) and air dry for
adhesion
at least 30 min at 25 6 5°C (77 6 9°F); then heat in air for 75
Corrosion resistance no blistering, cracking, or substrate degradation
to 90 min at 115 6 5°C (239 6 9°F). Test the cured film for
more than 3 mm from scribe mark
Humidity resistance no blistering, cracking, or loss of adhesion ability to meet the requirements listed in Table 2.
Heat resistance no blistering, cracking, softening, or loss of
5.2 Cured Film:
adhesion
5.2.1 Adhesion to Metal—Testtheadhesionoftheprimerto
Low-temperature shock no cracking or loss of adhesion
the metal by bending a primed metal sample over a conical
mandrelinaccordancewithTestMethodsD522,exceptusean
TABLE 3 Physical Properties of Bonded Specimens aluminum alloy panel.
5.2.2 Impact Resistance—Determine the impact resistance
Requirements
Test
(min)
of both the coated and uncoated side of a panel by subjecting
Normal-temperature lap shear, 25°C (77°F), MPa (psi) 20.0 (2900) the panel to the impact of a 0.45 kg (1 lb) mass dropped from
Low-temperature lap shear, −55°C (−67°F), MPa (psi) 20.0 (2900)
a height of 1 m (40 in.) using a Gardner 160-in·lbf capacity
High-temperature lap shear, 93°C (200°F), MPa (psi) 13.0 (1890)
impact testing machine or equivalent. Use the 0.45 kg (1 lb)
Humidity-exposure lap shear, 93°C (200°F), MPa (psi) 5.0 (725)
Salt-spray exposure lap shear, 35°C (95°F), MPa (psi) 16.0 (2320) falling weight. Apply a strip of masking tape over the most
Normal-temperature floating roller peel strength, 25°C 4400 (25.1)
highly stressed area on the coated side of each impact spot.
(77°F), N/m (lbf/in.)
Removethetapeinoneabruptmotionbypullingperpendicular
Low-temperature floating roller peel strength, −55°C 2625 (15.0)
(−67°F), N/m (lbf/in.) to the panel.
5.2.3 Pencil Hardness—Determine the pencil hardness of
the cured film using the following procedure:
5.2.3.1 Preparation of Pencils—Prepare a set of drawing
remaining as a percentage of the initial sample mass. Weigh-
pencils ranging in hardness from 6B to 5H by stripping the
ings before and after heating shall be accurate to 60.001 g.
woodawayfromtheendapproximately10mm( ⁄8in.)without
5.1.2 Inhibitor Content—Determine the inhibitor content in damaging the lead. Square the tip of the lead by holding the
pencilinaverticalpositionandmovingtheleadbackandforth
accordance with the following procedure (burn out method):
over 400-grit or finer abrasive paper. Square the tip of the lead
5.1.2.1 Tare four ignition loss crucibles and covers.
after each trial.
5.1.2.2 Pipette 2 mLportions of primer (1.75 g) from a well
5.2.3.2 Procedure—Place the test panel with the cured
mixed sample into each crucible, add about 2 mL of MEK to
primer applied in a horizontal position. Push pencils of
each, replace the lids, and devolatize the primer at 121 6 3°C
increasinghardnessintothecoatedsurfaceofthepanelata45°
(250 6 5°F) for 60 6 5 min.
angleuntiloneisfoundthatwillcutorscratchthecoating.Use
5.1.2.3 Cooltoroomtemperatureinadesiccator,weigh,and
the number of this pencil to express the primer hardness.
compute the mass of the nonvolatiles. The nonvolatile content
5.2.4 Environmental Resistance Test—For each test de-
requirement is 0.155 to 0.195 g/2 mL (10 6 1% by weight).
scribed in 5.2.5-5.2.9, clean five test panels of approximately
5.1.2.4 Place the crucibles with lids (and residue) in a
75 by 125 mm (3 by 5 in.) of either 6061T6 or 5052H34
furnace at 593°C (1100°F) for 60 6 5 min.
aluminum alloy (Fed. Spec. QQ-A-250/8d or QQ-A-250/11d,
5.1.2.5 Cooltoroomtemperatureinadesiccator,weigh,and
respectively) in accordance with Practice E864. Apply the
compute average mass of the inhibitor. The inhibitor content
primer and cure in accordance with 5.1.7. These panels when
requirement is 0.025 6 0.003 g/2 mL (15 6 3% by mass of
tested in accordance with the procedures described in 5.2.5-
nonvolatile content).
5.2.9 shall meet the requirements of Table 2
5.1.3 Storage Stability—Storeasampleoftheprimerforsix
5.2.5 Water Resistance—Immerse the panels with the cured
months from the date of shipment at−18°C (0°F), or two
primerappliedindistilledwaterforsevendaysat24 63°C(75
months at 5°C (41°F). Test the sample for ability to meet the
requirements of Tables 1-3.
5.1.4 Shelf Life—Store a sample of the primer for four days
No. 250 masking tape, 3M Co., has been found satisfactory.
at 25 6 7°C (77 6 12°F) and then test for ability to meet the
KOH-1-NOOR 1500, Venus Drawing Pencil, A. W. Faber Castell, or Eagle-
requirements listed in Tables 1-3. Turquoise have been found satisfactory.
E866–00
6 5°F) and then expose to 100% relative humidity at 50 6 roller peel test in Table 3 in accordance with Test Method
3°C (121 6 5°F) for 30 days. After this exposure, inspect the D3167 and Practice E864. The adherends shall be of either
film for blistering and cracking and test for loss of adhesion as 6061T6 or 5052H34 aluminum alloy. Cure the primer by air
described in 5.2.10 and for pencil hardness as in 5.2.3. dryingfornotlessthan30minat25 65°C(78 69°F);follow
by heating at 115 6 5°C (239 6 9°F) for 75 to 90 min. Bond
5.2.6 Heat Resistance—Heatthefivetestpanelspreparedas
the primed panel with an adhesive meeting Specification
describedin5.2.4at120 63°C(249 65°F)for70h.Afterthis
E865.
exposure, inspect the film for blistering and cracking and test
for loss of adhesion as des
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