1、U. S. AIR FORCE SPECIFICATION BULLETIN 10 Januhry 1968 SUPERSEDING USAF SPEC BUL 534 23 January 1964 CXJIDE FOR THE USE OF COATING SPECIFICATIONS IN AERONAUTICAL AND MISSILE EQUIPMENT 1. Scope and purpose. This bulletin provides a list of coating specifications intended for the control of corrosion
2、on Air Force aeronautical and missile equipment. The list includes preferred specifications, descriptive information, limitations, and general properties of the coating materials. 1.1 Contractors finish specification. A specification covering the protective finishfor application to the weapon system
3、s hardware shall be developed by the contractor and submitted for approval to the Air Force procuring activity in accordance with the individual contract. Unless otherwise specified the documents listed herein and MIL-F-7179 type II shall be the basis for preparing the finish specification. 1.2 Mter
4、ials and processes. The use of materials and processes not covered by specifications referenced in this bulletin will be subject to the approval of the Air Force procuring activity. Coating and process specifications not listed herein should be submitted by the contractor for evaluation and approval
5、. Materials will be subject at any time to such tests of the applicable specification as the Govern- ment inspector may require to assure conformance thereto. Proposed deviations, should be accompanied by sufficient explanation, including test data as required, to permit an engineering evaluation. 2
6、. Recommended coatinq materials and processes specifications. Be- cause of the peculiar mission or production techniques of each indi- vidual weapons system, this bulletin does not list all the necessary specification coatings; it specifies the recommended coating systems for general use and many ty
7、pical applications. General temperature limitations of each coating are given in parentheses. complete system considerations allow wide variance in these general limitations. Conditions and 2.1 Metal pretreatment coatinqs 2.1.1 MIL-M-3171 Magnesium Alloy, Processes For Pretreatment and Prevention of
8、 Corrosion On. This is a process specification covering a number of pretreatments for magnesium alloy passivation. The coatings covered by this specification are to be used for temporary protection or touch-up only. (200 - 250F) / -. THIS DOCUMENT CONTAINS a PAGES. Licensed by Information Handling S
9、ervicesMIL-G-534A 53 W 777970b 0076097 7 W 534A 2.1.2 MIL-C-5541 Chemical Films and Chemical Film Materials For Aluminum and Aluminum Alloys. This specification covers chemical conversion coatings for aluminum alloys. applied by brush, spray, or dip and are applicable when a-substitute for anodic co
10、atings is necessary. (3000 - 3500F) These coatings may be 2.1;3 MIL-C-8514 Coating Compound, Metal Pretreatment, Resin-Acid. The coating covered by this specification is commonly known as wash primer. clean bare metal or, in the case of magnesium, to pretreated surfaces. It is often used over chemic
11、al films and anodized aluminum surfaces and is an added insurance toward good adhesion of topcoat systems. (375O - 400F) It will perform satisfactorily when applied directly to 2.1.4 MIL-A-8625 Anodic Coatings , For Aluminum and Aluminum Alloys. This specification covers chromic and sulfuric acid an
12、odization processes. Sulfuric acid anodic coatings with a dichromate seal is preferred; however, for alloys containing less than 7 percent alloying constituents, chromic acid anodic coatings will give satisfactory result s. 2.1.5 MIL-M-45202 Maqnesium Alloys, Anodic Treatment Of. This is a process s
13、pecification covering anodic pretreatments for magnesium alloys. 2.2 Primer coatings 2.2.1 MIL-P-7962 Primer Coating, Cellulose, Nitrate Modified Alkyd Type, Corrosion Inhibitinq, Fast-Drying (For Spray Application Over Pretreatment Coatings). cation is specifically intended for the acrylic-nitrocel
14、lulose system which is the “standard“ Air Force paint system. for use over Hash primer-treated surfaces. 2.2.2 MIL-P-8585 Primer Coating, Zinc Chromate, Low-Moisture- Sensitivity. This specification covers the common zinc chromate primer. The primer coating is used as a fastener “sealant“ and as a f
15、aying surface coating, as ve11 as a general-usage corrosion inhib- iting primer. (375O - 400F) 2.2.3 MIL-P-23377 Primer Coating; EFOXY Polyamide, Chemical and Solvent Resistant. is inhibitive and also should be used as the Frimer for the thermally- reflective system. properly applied and cured, is v
16、ery difficult to remove. The lacquer primer covered by this specifi- The primer is intended (350 - 400F) The epoxy primer covered by this specification This primer is a tw-package material and, when (500 - SSOOF) 2 - Licensed by Information Handling ServicesMIL-G-53LlA 53 = 9999906 O096098 O = 2.3 T
17、opcoat materials 2.3.1 MIL-E-7729 Enamel, Gloss. This specification covers three types of alkyd enamel: air-dry type, low temperature bake, and high temperature bake. general use. nie air-dry type is no longer recommended for The bake types are used when a baked finish is required. 2.3.2 MIL-L-19537
18、 Lacquer: Acrylic-Nitrocellulose, Gloss (For Airbraft Use). This specification covers the gloss lacquer topcoat for the standardtf Air Force paint system. This lacquer topcoat material is easy to apply and air dries rapidly. (3250 - 350F) 2.3.3 MIL-L-19538 Lacquer: Acrylic-Nitrocellulose, Camouflage
19、 (For Aircraft Use). camouflage lacquer which, like the MIL-L-19537 material, is intended as a topcoat for the *fstandardtf Air Force paint system. This lacquer is also easy to apply and air dries rapidly. 2.3.4 MIL-C-27227 Coatins, Polyurethane, Thermal Resistant, For This specification covers acry
20、lic-nitrocellulose (325O - 350F) Aircraft Application. The coating covered by this specification is the white coatins develoDed to Drovide hiqh reflectivity to thermal flux. itself wll to production. this coating is used on wheels, landing gears, and missiles. It is a tk-package system but wili air
21、dry rapidly lending In addition to aircraft surface application, (400O - 425OF) 2.3.5 MIL-C-38412 Coatinq, Polyurethane, Colored, for Aerospace Application. The coating covered by this specification is intended for use as marking and general purpose exterior protective coating for metal surfaces. It
22、 covers both one- and two-component urethane systems presently in six colors. 2.3.6 MIL-L-81352 Lacquer: Acrylic (For Naval Weapons Systemsl. The lacquer conforming to this specification is intended for use as a general purpose protective coating or metal surfaces which require better resistance to
23、diester fluids at higher temperatures than the “standard“ MIL-L-19537 lacquer. (350 - 400F) (400 - 500F) 2.4 Specialty coatings 2.4.1 IT-P-28 Paint, Aluminum, Heat Resisting (1200OF). The paint covered by this specification is a silicone-based material developed specifically for high temperature app
24、lications up to 1200OF. applications are on jet engine tailcones and heat ducts. Typical 2.4.2 MIL-R-3043 Resin Coating; Unpiqmented, For Engine Components and Metal Farts. This specification covers a dyed phenolic resin coating which is used on engine parts and parts housed in oil or grease, exclus
25、ive of bearing surfaces. 3 Licensed by Information Handling Services534A 2.4.3 Nonslip. walkway areas. MIL-W-5044 Walkway Compound, Nonslip and Walkuav Mattins, The coating covered by this specification is applied to 2.4.4 MIL-C-7439 Coatins System, Elastomeric, Rain Erosion Resistant and Rain Erosi
26、on Resistant With Anti-Static Treatment, For Exterior Aircraft and Missile Plastic Parts and MIL-C-27315 Coating Systems, Elastprneric, Thermally Reflective and Rain Erosion Resistant, The coatings covered by these two specifications are neoprene-based materials. They were originally developed for p
27、lastic radomes but are used extensively on metal leading edges. in battery acid areas. They are also applied 2.4.5 MIL-P-15930 Primer Coating, Shipboard, Vinyl-Zinc Chromate _(Formula No. 120 - For Hot Spray) and MIL-P-15936 Enamel, Exterior, Gray, No. 27 (Vinyl-Alkyd) (Formula No. 122-271. The syst
28、em covered by these specifications is not used extensively on aircraft. It is . temperature limited and has other undesirable features, does have good resistance to both alkali and acid. some magnesium finishing, in battery areas, for relief areas, and for other applications where corrosive fluids a
29、re encountered. However, it It is used for 2.4.6 Fuel Tanks. The coating covered by this specification is based on a polyurethane polymer. However, since the specification is a perfor- mance type document, other types of coating are permitted if perfor- mance requirements are met. which is preferabl
30、y applied by spray but may also be applied by brush. (400 - 450F) MIL-C-27725 Coating, Corrosion Preventive, For Aircraft Integral This coating is a tw-package material 3. Other considerations in protective finish systems 3.1 Metal coatings - MIL-S-5002 Surface Treatments and Metallic Coatings for M
31、etal Surfaces of Weapons Systems. covers the pretreatment, plating and other metal finishing specifications. This specification 3.2 Colors - MIL-M-25047 Markinq for Airplanes, Airplane Parts and Missiles (Ballistic Missiles Excluded). General exterior color desig- nations are given in this specifica
32、tion. However, there are several technical considerations for color which are included in this bulletin. 3.2.1 Aluminum. This is the general “standard color for Air Force weapons systems. force the organic binders so that the durability and “lifegf of the coating is appreciably increased when compar
33、ed to normal pigmented coatings, The aluminum color should approximate color No. 17178 of Federal Standard 595. This is recommended because metallic pigments rein- 4 Licensed by Information Handling Services534A 3.2.2 White. Cargo and cabin compartments can be maintained at lower temperatures by coa
34、ting the upper surfaces of the fuselage with white color No. 17875 of Federal Standard 595. For thermal reflectivity it is better to use an untinted white. Such a white is required by MIL-C-27227. 3.2.3 Camouflage. The pigmentation of some camouflage colors is especially chosen because of desirable
35、infrared reflecting properties. Not all camouflage colors exhibit these infrared characteristics and therefore cannot be substituted one for the other, Custodian: Air Force - 11 Preparing activity : Air Force - 11 .- 5 * U.S. GOVERNMENT PRINTING OFFICE: i968-1416/3760 Licensed by Information Handling Services
