1、Designation: E866 11Standard Specification forCorrosion-Inhibiting Adhesive Primer for Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter Panels1This standard is issued under the fixed designation E866; the number immediately following the designation indicates the year oforiginal adoption
2、or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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
3、1.1 This specification covers sprayable, pigmented liquidprimers for use on aluminum alloys that are to be adhesivelybonded in the fabrication of honeycomb sandwich panels fortactical shelters. When applied to a properly cleaned surface ofaluminum alloy, the primer imparts corrosion resistance andfo
4、rms a surface suitable for structural bonding using adhesivescomplying with Specification E865 and for coating with shelterpaint finishes.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided
5、 for informa-tion only and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility
6、 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusB209 Specification for Aluminum and Aluminum-AlloySheet and PlateD522 Test Methods for Mandrel Bend Test of AttachedOrganic CoatingsD1002 Test Method for Apparent
7、Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading (Metal-to-Metal)D3167 Test Method for Floating Roller Peel Resistance ofAdhesivesE864 Practice for Surface Preparation of Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter PanelsE865 Specification for
8、Structural Film Adhesives for Hon-eycomb Sandwich PanelsE1749 Terminology Relating to Rigid Wall RelocatableShelters2.2 Federal Specifications:3QQ-A-250/8d Aluminum Alloy 5052H34, Plate and SheetQQ-A-250/11d Aluminum Alloy 6061T6, Plate and Sheet3. Materials and Manufacture3.1 The primer shall be a
9、pigmented liquid composed of amodified epoxy resin system, compounded so that it can bespray-applied to produce a continuous uniform coating withoutaddition of solvent.4. Physical Requirements4.1 The uncured primer must meet the requirements ofTable 1. The cured primer must meet the requirements of
10、Table2 and Table 3. These requirements shall be verified by testsdescribed in Section 5.4.2 Properties of Cured FilmWhen applied and cured inaccordance with 5.1.7, the cured film shall meet the require-ments of Table 2 and Table 3 when tested as specified in5.2-5.3.8.4.3 Storage StabilityPrimer stor
11、ed in accordance with themanufacturers instructions shall meet the requirements ofTable 1 and when cured in accordance with 5.1.7 shall meet therequirements of Table 2 and Table 3 when tested as specified in5.2-5.3.8.4.4 Shelf LifeThe shelf life of the primer at 25 6 7C (776 12F) shall be at least f
12、our days.After four days, when testedin accordance with 5.1.4, the primer shall be capable ofmeeting all of the requirements of this specification.4.5 Film ThicknessThe film thickness for all tests shall bebetween 0.003 and 0.007 mm (0.0001 and 0.0003 in.).1This specification is under the jurisdicti
13、on of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.53on Materials and Processes for Durable Rigidwall Relocatable Structures.Current edition approved May 1, 2011. Published May 2011. Originallyapproved in 1982. Last previous edition approved in 2
14、005 as E866 05. DOI:10.1520/E0866-11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standard
15、ization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/dodssp.daps.dla.mil.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Test Methods5.1 Uncured Primer:5.1.1 Solids ContentD
16、etermine the solids content by heat-ing a 5 g sample of thoroughly mixed primer in an aluminumweighing dish in a circulating air oven at 105 6 2C (221 63F) for not less than 3 h. Calculate the mass of solidsremaining as a percentage of the initial sample mass. Weigh-ings before and after heating sha
17、ll be accurate to 60.001 g.5.1.2 Inhibitor ContentDetermine the inhibitor content inaccordance with the following procedure (burn out method):5.1.2.1 Tare four ignition loss crucibles and covers.5.1.2.2 Pipette 2 mL portions of primer (1.75 g) from a wellmixed sample into each crucible, add about 2
18、mL of MEK toeach, replace the lids, and devolatize the primer at 121 6 3C(250 6 5F) for 60 6 5 min.5.1.2.3 Cool to room temperature in a desiccator, weigh, andcompute the mass of the nonvolatiles. The nonvolatile contentrequirement is 0.155 to 0.195 g/2 mL (10 6 1 % by weight).5.1.2.4 Place the cruc
19、ibles with lids (and residue) in afurnace at 593C (1100F) for 60 6 5 min.5.1.2.5 Cool to room temperature in a desiccator, weigh, andcompute average mass of the inhibitor. The inhibitor contentrequirement is 0.025 6 0.003 g/2 mL (15 6 3 % by mass ofnonvolatile content).5.1.3 Storage StabilityStore a
20、 sample of the primer for sixmonths from the date of shipment at 18C (0F), or twomonths at 5C (41F). Test the sample for ability to meet therequirements of Tables 1-3.5.1.4 Shelf LifeStore a sample of the primer for four daysat 25 6 7C (77 6 12F) and then test for ability to meet therequirements lis
21、ted in Tables 1-3.5.1.5 ColorSpray the primer onto an aluminum alloypanel, leaving a portion of the panel bare. Compare the coatedand uncoated areas visually against the color requirements inTable 1.5.1.6 SprayabilityThe primer shall be capable of beingreadily applied in accordance with the manufact
22、urers instruc-tions to all test panels of either 6061T6 or 5052H34 aluminumalloy (Fed. Spec. QQ-A-250/8d or QQ-A-250/11d, respec-tively, or Specification B209) and cleaned in accordance withPractice E864 for each of the tests described in 5.1.7-5.3.8.Inspect the coating for uniformity of thickness a
23、nd color.5.1.7 Curing PropertiesSpray the primer onto a test panel100 by 150 by 0.05 mm (4 by 6 by 0.020 in.) and air dry forat least 30 min at 25 6 5C (77 6 9F); then heat in air for 75to 90 min at 115 6 5C (239 6 9F). Test the cured film forability to meet the requirements listed in Table 2.5.2 Cu
24、red Film:5.2.1 Adhesion to MetalTest the adhesion of the primer tothe metal by bending a primed metal sample over a conicalmandrel in accordance with Test Methods D522, except use analuminum alloy panel.5.2.2 Impact ResistanceDetermine the impact resistanceof both the coated and uncoated side of a p
25、anel by subjectingthe panel to the impact of a 0.45 kg (1 lb) mass dropped froma height of 1 m (40 in.) using a Gardner 160-inlbf capacityimpact testing machine or equivalent. Use the 0.45 kg (1 lb)falling weight. Apply a strip of masking tape4over the mosthighly stressed area on the coated side of
26、each impact spot.Remove the tape in one abrupt motion by pulling perpendicularto the panel.5.2.3 Pencil HardnessDetermine the pencil hardness ofthe cured film using the following procedure:5.2.3.1 Preparation of PencilsPrepare a set of drawingpencils5ranging in hardness from 6B to 5H by stripping th
27、ewood away from the end approximately 10 mm (38 in.) withoutdamaging the lead. Square the tip of the lead by holding thepencil in a vertical position and moving the lead back and forthover 400-grit or finer abrasive paper. Square the tip of the leadafter each trial.5.2.3.2 ProcedurePlace the test pa
28、nel with the curedprimer applied in a horizontal position. Push pencils ofincreasing hardness into the coated surface of the panel at a 45angle until one is found that will cut or scratch the coating. Usethe number of this pencil to express the primer hardness.4No. 250 masking tape, 3M Co., has been
29、 found satisfactory. If you are awareof alternative suppliers, please provide this information to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee1, which you may attend.5KOH-1-NOOR 1500, Venus Drawing Pencil, A. W. F
30、aber Castell, or Eagle-Turquoise have been found satisfactory. If you are aware of alternative suppliers,please provide this information to ASTM International Headquarters. Your com-ments will receive careful consideration at a meeting of the responsible technicalcommittee1, which you may attend.TAB
31、LE 1 Physical Properties of Uncured Liquid PrimerTest RequirementSolids content, % 10 6 1Inhibitor Content,A%156 3Color easily visible filmSprayability film is of uniform thickness and colorABased on mass of nonvolatile content.TABLE 2 Physical Properties of Cured Film on Primed SurfacesTest Require
32、mentAdhesion to metal no cracking or loss of adhesionImpact resistance no cracking or loss of adhesion (on either side)Pencil hardness 4H minimumWater resistance no blistering, cracking, softening, or loss ofadhesionCorrosion resistance no blistering, cracking, or substrate degradationmore than 3 mm
33、 from scribe markHumidity resistance no blistering, cracking, or loss of adhesionHeat resistance no blistering, cracking, softening, or loss ofadhesionLow-temperature shock no cracking or loss of adhesionTABLE 3 Physical Properties of Bonded SpecimensTestRequirements(min)Normal-temperature lap shear
34、, 25C (77F), MPa (psi) 20.0 (2900)Low-temperature lap shear, 55C (67F), MPa (psi) 20.0 (2900)High-temperature lap shear, 93C (200F), MPa (psi) 13.0 (1890)Humidity-exposure lap shear, 93C (200F), MPa (psi) 5.0 (725)Salt-spray exposure lap shear, 35C (95F), MPa (psi) 16.0 (2320)Normal-temperature floa
35、ting roller peel strength, 25C(77F), N/m (lbf/in.)4400 (25.1)Low-temperature floating roller peel strength, 55C(67F), N/m (lbf/in.)2625 (15.0)E866 1125.2.4 Environmental Resistance TestFor each test de-scribed in 5.2.5-5.2.9, clean five test panels of approximately75 by 125 mm (3 by 5 in.) of either
36、 6061T6 or 5052H34aluminum alloy (Fed. Spec. QQ-A-250/8d or QQ-A-250/11d,respectively, or Specification B209) in accordance with Prac-tice E864.Apply the primer and cure in accordance with 5.1.7.These panels when tested in accordance with the proceduresdescribed in 5.2.5-5.2.9 shall meet the require
37、ments of Table 25.2.5 Water ResistanceImmerse the panels with the curedprimer applied in distilled water for seven days at 24 6 3C (756 5F) and then expose to 100 % relative humidity at 50 63C (121 6 5F) for 30 days. After this exposure, inspect thefilm for blistering and cracking and test for loss
38、of adhesion asdescribed in 5.2.10 and for pencil hardness as in 5.2.3.5.2.6 Heat ResistanceHeat the five test panels prepared asdescribed in 5.2.4 at 120 6 3C (249 6 5F) for 70 h.After thisexposure, inspect the film for blistering and cracking and testfor loss of adhesion as described in 5.2.10 and
39、for pencilhardness as in 5.2.3.5.2.7 Low-Temperature ShockSubject the five test panelsprepared as in 5.2.4 to 24 cycles, each consisting of 25 min at65 6 3C (150 6 5F) then, following transfer within 5 s, 5min at 55 6 3C (666 5F). On completion of the last cyclethe panel shall remain in a cold box m
40、aintained at 55 6 3C(66 6 5F) for 5 h. Bend the panel rapidly over a 100-mm(4-in.) diameter mandrel that has been conditioned at the samecondition for a minimum of 45 min. Panel evaluation afterexposure shall include inspection for cracking and the adhesiontest in accordance with 5.2.10. When a norm
41、al work day willnot allow completion of this test, the cycle shall be interruptedat the end of the low temperature exposure (store overnight atroom temperature) and start again at the hot cycle.5.2.8 Corrosion ResistanceScribe the five test panelsprepared in accordance with 5.2.4 through the coating
42、 to thebase metal with two diagonal scribe marks extending fromcorner to corner and exposed to 5 % salt spray in accordancewith Practice B117 for 40 days.5.2.9 Humidity AgingExpose the five test panels preparedin accordance with 5.2.4 to a relative humidity of 100 % at 506 3C (121 6 5F) for 30 days.
43、After this exposure, inspect thefilm for blistering and cracking and test for loss of adhesion asdescribed in 5.2.10.5.2.10 Loss of Adhesion:5.2.10.1 Thoroughly dry the panel by wiping with a cleandry cheesecloth. Conduct the test at 20 to 27C (68 to 80F).5.2.10.2 Scribe two parallel scratches 25 mm
44、 (1 in.) apart,through the coating down to the metal, with a sharp-edgescribe.5.2.10.3 Apply a strip of 25-mm (1-in.) wide masking tape(not more than five months old from date of manufacture)across the scratches at 90 in the panel area to be tested. Pressthe tape down using two passes of a 2-kg (4.5
45、-lb) rubber-covered roller approximately 90 mm (3.5 in.) in diameter by 45mm (1.75 in.) in width. The Durometer of the roller surfaceshall be 70 to 80 Shore A.5.2.10.4 As an alternative to 5.2.10.3, the tape shall bepressed down by rolling the tape roll along the strip of appliedtape using a firm ha
46、nd pressure of approximately 2 kg (4 to 5lb).5.2.10.5 Remove the tape in one abrupt motion perpendicu-lar to the panel. No primer shall be removed from the panel,other than that which was previously removed during thescribing procedure (see 5.2.10.2).5.3 Bonding Property Tests:5.3.1 Preparation of T
47、est Specimens Prepare and test fivetest specimens, in accordance with Test Method D1002 andPractice E864, for each of the required lap-shear tests in Table3. In addition, prepare five test specimens for each floatingroller peel test in Table 3 in accordance with Test MethodD3167 and Practice E864. T
48、he adherends shall be of either6061T6 or 5052H34 aluminum alloy (Fed. Spec. QQ-A-250/8dor QQ-A-250/11d, respectively, or Specification B209). Curethe primer by air drying for not less than 30 min at 25 6 5C(78 6 9F); follow by heating at 115 6 5C (239 6 9F) for75 to 90 min. Bond the primed panel wit
49、h an adhesive meetingSpecification E865.5.3.1.1 TestsThe primer shall be subjected to all the testsdescribed in this section. Lap-shear tests (see 5.3.2-5.3.5) shallbe performed in accordance with Test Method D1002.5.3.2 Normal-Temperature Lap ShearSubject each speci-men to a lap shear test at 25 6 3C (77 6 5F).5.3.3 Low-Temperature Lap ShearTest each specimen forlow-temperature lap shear at 55 6 3C (66 6 5F). Bringthe temperature of the specimen to 556 3C (66 6 5F) asindicated by
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