1、Designation: E 866 05Standard Specification forCorrosion-Inhibiting Adhesive Primer for Aluminum Alloysto Be Adhesively Bonded in Honeycomb Shelter Panels1This standard is issued under the fixed designation E 866; the number immediately following the designation indicates the year oforiginal adoptio
2、n or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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. Sc
3、ope1.1 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 an
4、dforms a surface suitable for structural bonding using adhesivescomplying with Specification E 865 and for coating withshelter paint finishes.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purpor
5、t 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 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B117
6、Practice for Operating Salt Spray (Fog) ApparatusB 209 Specification for Aluminum and Aluminum AlloySheet and PlateD 522 Test Methods for Mandrel Bend Test of AttachedOrganic Coatings3D 1002 Test Method forApparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Load
7、ing (Metal-to-Metal)D 3167 Test Method for Floating Roller Peel Resistance ofAdhesivesE 864 Practice for Surface Preparation ofAluminumAlloysto be Adhesively Bonded in Honeycomb Shelter PanelsE 865 Specification for Structural Film Adhesives for Hon-eycomb Sandwich PanelsE 1749 Terminology of Rigid
8、Wall Relocatable Shelters2.2 Federal Specifications:QQ-A-250/8d Aluminum Alloy 5052H34, Plate and Sheet4QQ-A-250/11d Aluminum Alloy 6061T6, Plate and Sheet43. Materials and Manufacture3.1 The primer shall be a pigmented liquid composed of amodified epoxy resin system, compounded so that it can bespr
9、ay-applied to produce a continuous uniform coating withoutaddition of solvent.4. Physical Requirements Physical Requirements4.1 The uncured primer must meet the requirements ofTable 1. The cured primer must meet the requirements of Table2 and Table 3. These requirements shall be verified by testsdes
10、cribed 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 stored in accordance with themanufacturers instructions shall meet the r
11、equirements 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 four days.After four days, when testedin accordance with 5.1.4, the p
12、rimer 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.).5. Test Methods5.1 Uncured Primer:5.1.1 Solids ContentDetermine the solids content by heat-ing a 5 g sample of
13、thoroughly mixed primer in an aluminum1This specification is under the jurisdiction 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, 2005. Pu
14、blished May 2005. Originallyapproved in 1982. Last previous edition approved in 2000 as E 866 00.2For 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 Docum
15、ent Summary page onthe ASTM website.3Withdrawn.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-50981Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.weighing dis
16、h 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 shall be accurate to 60.001 g.5.1.2 Inhibitor ContentDetermine the inhibitor content inaccordance with the fo
17、llowing 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 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
18、 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 crucibles with lids (and residue) in afurnace at 593C (1100F) for 60 6 5 min.5.1.2.5 Cool to room temperature
19、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 sample of the primer for sixmonths from the date of shipment at 18C (0F), or twomonths at 5C (41F). Test
20、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 listed in Tables 1-3.5.1.5 ColorSpray the primer onto an aluminum alloypanel, leaving a portion of the panel
21、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 manufacturers instruc-tions to all test panels of either 6061T6 or 5052H34 aluminumalloy (Fed. Spec. QQ-A-250/8d o
22、r QQ-A-250/11d, respec-tively) and cleaned in accordance with Practice E 864 for eachof the tests described in 5.1.7-5.3.8. Inspect the coating foruniformity of thickness and 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
23、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 Cured Film:5.2.1 Adhesion to MetalTest the adhesion of the primer tothe metal by bending a primed metal sample over a conicalmandr
24、el in accordance with Test Methods D 522, except use analuminum alloy panel.5.2.2 Impact ResistanceDetermine the impact resistanceof both the coated and uncoated side of a panel 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-inl
25、bf capacityimpact testing machine or equivalent. Use the 0.45 kg (1 lb)falling weight. Apply a strip of masking tape5over the mosthighly stressed area on the coated side of each impact spot.Remove the tape in one abrupt motion by pulling perpendicularto the panel.5.2.3 Pencil HardnessDetermine the p
26、encil hardness ofthe cured film using the following procedure:5.2.3.1 Preparation of PencilsPrepare a set of drawingpencils6ranging in hardness from 6B to 5H by stripping thewood away from the end approximately 10 mm (38 in.) withoutdamaging the lead. Square the tip of the lead by holding thepencil
27、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 panel with the curedprimer applied in a horizontal position. Push pencils ofincreasing hardness into the coated surface of the pa
28、nel at a 45angle until one is found that will cut or scratch the coating. Usethe number of this pencil to express the primer hardness.5.2.4 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 6061T6 or 5052H
29、34aluminum alloy (Fed. Spec. QQ-A-250/8d or QQ-A-250/11d,respectively, or Specification B 209) in accordance with Prac-tice E 864.Apply the primer and cure in accordance with 5.1.7.5No. 250 masking tape, 3M Co., has been found satisfactory. If you are awareof alternative suppliers, please provide th
30、is information to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee1, which you may attend.6KOH-1-NOOR 1500, Venus Drawing Pencil, A. W. Faber Castell, or Eagle-Turquoise have been found satisfactory. If you are aware
31、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.TABLE 1 Physical Properties of Uncured Liquid PrimerTest RequirementSolids content,
32、 % 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 RequirementAdhesion to metal no cracking or loss of adhesionImpact resistance no cracki
33、ng 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 from scribe markHumidity resistance no blistering, cracking, or loss of adhesio
34、nHeat 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, 25C (77F), MPa (psi) 20.0 (2900)Low-temperature lap shear, 55C (67F), MPa (psi
35、) 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 floating roller peel strength, 25C(77F), N/m (lbf/in.)4400 (25.1)Low-temperature flo
36、ating roller peel strength, 55C(67F), N/m (lbf/in.)2625 (15.0)E866052These panels when tested in accordance with the proceduresdescribed in 5.2.5-5.2.9 shall meet the requirements of Table 25.2.5 Water ResistanceImmerse the panels with the curedprimer applied in distilled water for seven days at 24
37、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 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
38、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 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
39、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 maintained 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
40、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 normal work day willnot allow completion of this test, the cycle shall be interruptedat the end of the low temperature exposure (s
41、tore 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 to thebase metal with two diagonal scribe marks extending fromcorner to corner and exposed to 5 % salt spray in accordancewit
42、h Practice B117for 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.After this exposure, inspect thefilm for blistering and cracking and test for loss of adhesion asdescribed in 5.2.10.5.2.10 Los
43、s 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 (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 mask
44、ing 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-lb) rubber-covered roller approximately 90 mm (3.5 in.) in diameter by 45mm (1.75 in.) in width. The Durometer of the roller s
45、urfaceshall 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 hand 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 prim
46、er 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 Test Specimens Prepare and test fivetest specimens, in accordance with Test Method D 1002 andPractice E 864, for each of the req
47、uired lap-shear tests in Table3. In addition, prepare five test specimens for each floatingroller peel test in Table 3 in accordance with Test MethodD 3167 and Practice E 864. The adherends shall be of either6061T6 or 5052H34 aluminum alloy. Cure the primer by airdrying for not less than 30 min at 2
48、5 6 5C (78 6 9F); followby heating at 115 6 5C (239 6 9F) for 75 to 90 min. Bondthe primed panel with an adhesive meeting SpecificationE 865.5.3.1.1 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 Te
49、st Method D 1002.5.3.2 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 a thermocouple at the bond area and stabilize for10 min just prior to test.5.3.4 High-Temperature Lap ShearTest each specimenfor high-temperature lap shear at 93 6 3C (200 6 5F). Bringthe temperatu
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