1、- - i- . MIL-C-8562LIA HF 7797706 0433372 3 I NOT MEASUREMENT SENSITIVE I MI L-C-856 1 4A 27 February 1990 SUPERSEDING MI L-C-85614(AS) 30 June 1989 MILITARY SPECIFICATION COATING, FASTENER (TITANIUM AND CRES ALLOYS), ALUMINUM PIGMENTED, ORGANICALLY BONDED (FOR ALL THREADED AND UNTHREADED FASTENERS)
2、 This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE * 1.1 Scope. This specification covers the acceptance requirements for an aluminum pigmented, organically bonded coating applied at temperatures not greater than 450F to al 1 threaded and u
3、nthreaded fasteners made from titanium and corrosion resi stant steel alloys. 2, APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. otherwise specified, the issues
4、of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the sol i ci tation (see 6.2). Unless SPECIFICATIONS FEDERAL QQ-A-22 5 Aluminum Alloy Bar, Rod and Wire QQ-P-416 Plating, Cadmium (Electrodepo
5、sited) MILITARY MIL-A-8625 Anodi c Coati ngs for Al umi num and Al urni num Al loys Benef i c i al comments , ( recomme ndat i ons , add i ti on s , de 1 et i ons 1 and any pert i nen t data which may be of use in improving this document should be addressed to the Naval Air Engineering Center, Syste
6、ms Engineering and Standardization Department (SESD) (Code 531, Lakehurst, NJ 08733-5100, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC MFFP DISTRIBUTION STATEMENT A: Approved for public relea
7、se; distribution is unlimited. 0 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-85614A flF 9799906 0413373 5 H MIL-C-85614A SPECIFICATIONS (Continued) MI L-S-5000 MIL-S-8879 Steel, Chrome-Ni ckel-Molybdenum (E4340) Bars and Reforging Stock Scr
8、ew Threads, Control 1 ed Radi us Root wi th Increased Minor Diameter, General Specification for MI L-R-81294 Remover, Paint, Epoxy and Polyurethane Systems MI L-H-83306 MI L-L-87 1 32 MI L-T-81533 STANDARDS Hydraulic Fluid, Fire Resistant, Phosphate Ester Base, Ai rcraft Lubricant, Cetyl Alcohol, 1
9、Hexadeconal, Appli- cation to Fasteners Trichloroethane 1,1,1 (Methylchloroform) Inhibited Vapor Degreasing MI LI TARY MI L-STD-6866 Inspection, Penetrant, Method of (Unless otherwise indicated, copies of federal and military specifications, standards, and handbooks are available from the Naval Publ
10、ications and Forms Center, (ATTN: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) * 2.2 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those l
11、isted in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM B 287 Acetic Acid, Spray (FOG) Testing
12、ASTM D 740 Methyl Ethyl Ketone (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1187.) 2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the tex
13、t f this document takes precedence. Nothi ng in thi s document, however, supersedes appl i cable 1 aws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS subjected to first article Inspection in accordance with 4.3 - .3.1 First article. When specifled (see 6.21, a sample
14、shall be 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-85bL4A MF W 9977906 0433374.7 m MI L-C-85614A 3.2 Materials. The materials used shall be such as to produce organically bonded aluminum coatings which conform to this specification. 3.
15、3 Equipment and processes. The equipment and processes shall be caDable of wovidinq a uniform coating in accordance with the requirements of thi s speci fi cat ion. - 3.3.1 Cleaning. Before coating, fasteners shall have clean surfaces with no evidence of erosion, pitting or intergranular attack. 3.3
16、.1.1 Coating process. The coating may be applied directly to the fastener surface, or the fastener may have a chemical conversion or mechanical pretreatment. function. below the minimum tempering temperature of the fastener, and shall not be greater than 425F. Pretreatment shall not be deleterious t
17、o the fastener or its The cure temperature of the coating shall be not greater than 50F 3.4 Appearance. The coating shall be smooth and of uniform thickness and color. It shall be free of pin holes, porosity, blisters, nodules, pits or other harmful imperfections. the thread surfaces, and under the
18、head. * 3.6 Thickness. The coating thickness shall be 0.0002 to 0.0005 inches (see 4.5.1). Coating is not required inside lightening holes in the head or point end, inside wrenching features, inside lockwire holes, or on breakaway devices (lock bolt pull stems, etc.). 3.5 Areas of deposit. As a mini
19、mum, the coating shall cover the shank, 3.7 Adhesion. After being subjected to the test specified in 4.5.2, the coating shall be continuously bonded to the fastener and shall not display loss of adhesion or separation from the fastener when examined at a magni f i cation of 4X. 3.8 Fluid resistance.
20、 The coating shall be immersed in hydraulic fluid conforming to MIL-H-83306 for 30 days (720 hours). The coating shall show no evidence of blistering or loss of adhesion. Coating shall be not less than 4H pencil hardness prior to immersion and not less than 2H pencil hardness subsequent to immersion
21、 (see 4.5.3). 3.9 Paint remover resistance. The coated fasteners shall show no evidence of blistering or loss of adhesion when subjected to the paint remover test (see 4.5.4). 3.10 Embrittlement. Coated titanium fasteners shall display no evidence of cracking in the head-to-shank fillet or thread ar
22、eas (see 4.5.5 and table II). 3.10.1 Embrittlement test block. The test block used for the embrittlement test (see 4.5.5) shall be a 7075-T6 aluminum alloy block (UNS A970751 in accordance with QQ-A-225/9. The block thickness shall be compatible with the grip lengths of the four coated fasteners use
23、d in the test. 3.11 Corrosion protective properties of coatings. The applied coating on the countersink areas and surface areas of the 2024 aluminum alloy (UNS 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-85614A MF 7797906 0433375 7 MI L-C
24、-856 14A A920241 blocks surrounding the coated fasteners shall display no more corrosion than the corresponding areas with the cadmium plated fastener control blocks (see 4.5.6). or blistering when tested in accordance with 4.5.7. After heating, the coating shall be tested in accordance with 4.5.2 a
25、nd shall meet the require- ments specified in 3.7. accordance with 4.5.2.1 and shall meet the requirements specified in 3.7. shall be not greater than the values listed in table I when tested in accordance wi th 4.5.8. 3.12 Heat resistance. The coating shall display no evidence of cracking 3.12.1 Ad
26、hesion test. After heating, the coating shall be tested in 3.13 Installation force. The installation forces for coated fasteners TABLE I. Installation force requirements. Fastener Di ameter Nomi na1 0.25 inch 0.3125 inch 0.375 inch Interference Fit in Inches .003-. 005 .003-. 005 003- 005 Load Rate
27、Instal lation Force Per Mi nute Force Force Pounds Mean Max i mum 5,000 1,300 2,000 7,000 1,500 2,250 11,000 1,500 2,300 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance
28、of al 1 inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by th
29、e Government. The Government reserves the right to perform any of the inspections set forth in this specification when such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items must meet al 1 requirements
30、of section 3. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the Government for acceptance comply with al
31、l requirements of the contract. Sampling inspection, as part of manufacturi ng operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acc
32、ept defective material. The absence of any inspection requirements in the specification 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 MIL-C-85634A NF W 7799706 0433376 O MIL-C-85614A 4.2 Classification of inspections. The inspections specified
33、herein are classified as follows: a. First article inspection (see 4.3). b. Quality conformance inspection (see 4.4). e 4.3 First article inspection. First article inspections shall be as specified in Table II. JI 4.3.1 First article samples. The first article sample shall consist of 55 units. Of th
34、ese 55 units, 41 shall be coated fasteners. The fastener size shall be 0.25 inch in diameter or larger, with 2D grip or longer. The other 14 units shall be test specimens: five (5) for use in the adhesion test, five (5) for the fluid resistance test, two (2) for the paint remover test, and two (2) f
35、or the heat resistance test, The specimens shall be coated on both sides and have the following dimensions: 2 inches wide, 3 inches long, and 0.04 inches thick. Both the specimens and the fasteners shall be of the fastener material for which approval is requested, and coated with the type of coating
36、 for which approval is requested. 4.3.2 Inspection routine. Sample units shall be subjected to the inspections specified in table II in the order shown. TABLE II. First article inspection. In spec t i on Vi cual exami nation Thickness Ad hec i on Fluid resistance Pai nt remover resi stance Embrittle
37、ment (Titanium only) Corrosion protective properties of coatings Heat resistance Installation force Requirement Paragraph 34 & 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 rest Method 4.4.2 4.5.1 4.5.2 4.5.3 4.5.4 4.5.5 4.5.6 4.5.7 4.5.8 Quantity for Each Test 5 10 5 5 2 4 12 2 10 lumber of 1 lowable Ief
38、 ec ts O O O O O O O O O 4.3.3 Certified test report. The manufacturer shall furnish a certified test report showing that the manufacturers product satisfactorily conforms to this specification. The test report shall include actual results of the first article tests specified herein. When this repor
39、t is submitted, it shall be accompanied with data that completely describes the manufacturers product. The drawing shall specify all dimensions and tolerances, composition 0 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-SbL4A MF m 777770b O
40、YL3377 2 m MI L-C-856 1 4A - c of materials selected, coatings or platings applied. this report shall not exempt a manufacturer from first article inspection. The test data stated in 4.4 Qual i ty conformance inspection. Qual i ty conformance inspection shall consist of the inspections and tests spe
41、cified in table III. 4.4.1 Inspection lot. An inspection lot shall consist of fasteners coated at the same time, ,with coating material.from the same batch. case of small production runs, an inspection lot may be made up from a group of small lots coated under similar conditions (see 6.4). In the 4.
42、4.1.1 Sampling plan. The sampling plan shall be as specified in the contract or purchase order (see 6.2 and 6.5). 4.4.2 Visual inspection. The test specimens shall be visually examined to verify that the workmanship conforms to the appearance and the areas of deposit requirements. TABLE III. Quality
43、 conformance inspection. . Inspection Visual examination Thickness Adhesion test Test Requirement Met hod 3.4 8! 3.5 4.4.2 3.6 4.5.1 3.7 4.5.2 Paragraph Paragraph 4.5 Methods of inspection. 4.5.1 Thickness. Coating thickness shall be determined using instruments capable of producing measurements acc
44、urate to * 0.0001 inch. 4.5.2. Adhesion test. The adhesion test shall be conducted with a 0.5 inch diameter pin (minimum length of 3 inches), the test specimens (see 4.3.11, and two strips of 3M Company No, 250 tape or equivalent. The age limit on this tape shall be not greater than six months after
45、 the date of manufacture. The test shall be conducted as follows: a. Place thepin across the 2 inch side of the specimen. be located in the middle of the specimen. The pin shall b. Bend the specimen around the pin until a 90 degree angle is formed. c. Press one strip of tape across the inner bend of
46、 the specimen, and one strip across the outer bend of the specimen. The tape shall traverse the entire lengths of both sides of the bent surface. d. Remove the tape in one abrupt motion. e. Inspect both sides of the bent surface at 4X magnification for adhesion (3.7). 6 Provided by IHSNot for Resale
47、No reproduction or networking permitted without license from IHS-,-,- w z MIL-C-85634A MF W 7777706 0433378 4 W MI L-C-85614A Ji 4.5.3 Fluid resistance. The fluid resistance test shall be conducted as fol lows : a. Immerse five coated test specimens (4.3.11 in hydraulic fluid conforming to MIL-H-833
48、06 for 30 days (720 hours). o b. Dry the samples in air. c. Prepare pencils of varying hardness by squaring the tip of the lead before each trial. d, Test for hardness by pushing pencils of increasing hardness across the surface at a 45 degree angle until one cuts or scratches the coating. The numbe
49、r of this pencil shall represent the coating hardness. Test and inspect for adhesion according to 4.5.2. e. * 4.5.4 Paint remover resistance. The paint remover resistance test shall be conducted as follows: a. Immerse two coated test specimens (see 4.3.1) in paint remover conforming to MIL-R-81294, Type I, for not less than 24 hours at 70 * 5 OF. Rinse off the paint remover with tap water and allow to dry. b. a c. Test and inspect the test specime
