轴承座 支架 铸件加工定制 图纸[2024-04-17 10:16:29]
轴承座 支架 铸件加工定制 图纸，们其中一个设备需求，以铸钢 为主，消失模，年度铸造件 估计几百~上千万，报铸造工期 和 加工工期分别多久。 浙江 一、ZY-CT03B...轴承座 二、Y-CT03B...座支架 三、ZY-SJ03-...外套装配 四、Y-SJ03-...2轴承座
离心铸造的铸件加工外协[2024-03-29 11:32:55]
离心铸造的铸件加工外协，球铁的铸件，FCD700的环形铸件，先电话对接一下，寻中国供应商对接。 驻天津
管梁压铸件加工外协[2024-03-25 16:42:52]
管梁压铸件加工外协，镁铝合金工艺，寻厂家对接，我这是汽车设计公司。 上海
电子镁铝合金压铸件加工定制 图[2024-01-02 16:20:08]
电子镁铝合金压铸件加工定制 图，要求最大热室机1200吨以上，规格384*328.5*55，能做的厂家对接。 安徽
铝铸件加工定制 图纸[2023-12-22 08:50:10]
铝铸件加工定制，先三块，量产批量，我司是做电炉的，加我微信，我发原图纸。 广东
二冲程汽油马达汽缸盖 铝合金压铸件加工外协 图纸[2023-12-06 10:53:00]
二冲程汽油马达汽缸盖 铝合金压铸件加工外协 图纸，我们这边要签保密协议才能发完整图纸，这一款是140万套每年，我们是动力工具厂家。 山东
不锈钢铸件加工定制 图纸[2023-11-08 15:42:20]
不锈钢铸件加工定制 图纸，重量114.082KG，100件+，量不少，会持续要货，先看质量，我这是矿山机械厂。 河北
比亚迪汽车车锁铝合金浇铸件加工定制 图纸[2023-08-30 15:09:33]
比亚迪汽车车锁铝合金浇铸件加工定制 图纸，支架拉脱锁HC2EC-3414243，年用量40万。 技术要求 1、去毛刺倒锐边； 2、铸件不得出现砂眼，缩口，裂纹等现象； 3、未注圆角为C0.5~C1； 4、未注圆角为R2； 5、未注尺寸公差的极限偏差按QC/T269-1999汽车铸造零部件未注公差尺寸的极限偏差中的压铸规定。
ZG2Cr13精铸件加工定制 图[2023-07-20 15:43:06]
ZG2Cr13精铸件加工定制，我们要的东西种类比较多，我们提供模具，可以做蜡模直接生产，一年在3-4吨，具体要看全年的合同订单需求。 河北
球铁铸件加工定制 图[2023-06-13 17:41:20]
球铁铸件加工定制 图，材质是球铁40的，现在是前期选厂，感兴趣的厂家对接。 河北
重力铸件加工定制[2023-05-08 10:33:10]
重力铸件加工定制，我们是转向系统厂家，先做技术对接，联系我们。 河南 新乡
铝合金压铸件加工定制 图[2023-01-13 11:11:42]
铝合金压铸件加工定制 图，要求有产品16949认证，解放新产品项目，寻加工厂家对接，有量。 吉林 白城
喷嘴座+模具 铝合金6063压铸件加工定制 图纸[2022-03-09 11:04:59]
喷嘴座+模具 铝合金6063压铸件加工定制，我们开发供应商，内镶嵌有不锈钢管，月3W件（年40万件左右），一个是毛坯状态的报价 和含机加工的报价。 广西 南宁 技术要求 1. 浇注前需要将该水管组件放进模具中，将管铸到产品中。 2. 铸件表面上不允许有冷隔、裂纹、缩孔和穿透性缺陷及严重的残缺类缺陷(如欠铸、机械损伤等)。 3. 铸件应清除浇冒口、飞刺等。非加工表面上的浇冒口残留量要铲平、磨光,达到表面质量要求。 4. 零件加工表面上,不应有划痕、擦伤等损伤零件表面的缺陷。 5. 机加工工序在喷砂工序之后进行。
汽车尾气后处理系统压铸件加工定制[2022-02-08 15:16:21]
汽车尾气后处理系统压铸件加工定制，产品还在设计中，先寻压铸厂家对接。 重庆
航空连接器 铝压铸件加工出口 图纸[2022-01-12 05:49:03]
航空连接器 铝压铸件加工出口，到美国，要求AS9100 认证，两款压铸件，请按照MOQ 2K, 5K, 10K, 20K,50K 来报。 广东 深圳 1）原材料需符合ASTM-B85/B85M铝合金标准； 2）请素材和表面处理价格分开报； 3）表面处理的盐雾要求是168小时，表面处理标准如附件。 DETAIL SPECIFICATION CHEMICAL CONVERSION MATERIALS FOR COATING ALUMINUM AND ALUMINUM ALLOYS This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers chemical conversion materials used in the formation of coatings by the reaction of the material with the surfaces of aluminum and aluminum alloys. 1.2 Classification. The chemical conversion materials and application methods are of the following types, classes, material forms, and methods. 1.2.1. Types. The chemical conversion materials are of the following types (see 6.2). Type I – Compositions containing hexavalent chromium. Type II – Compositions containing no hexavalent chromium. 1.2.2 Classes. The materials, which form protective coatings by chemical reaction with aluminum and aluminum alloys, are of the following classes (see 6.2). Class 1A - For maximum protection against corrosion, painted or unpainted. Class 3 - For protection against corrosion where low electrical resistance is required. Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Air Warfare Center Aircraft Division, Code 414100B120-1, Highway 547, Lakehurst, NJ 08733-5100 or emailed to thomas.omara@navy.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at www.dodssp.daps.mil. AMSC N/A AREA MFFP Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 1.2.3 Material forms. Chemical conversion materials are of the following forms (see 6.2). Form I – Concentrated liquid Form II – Powder Form III – Premixed liquid (ready for use touch-up brush application) Form IV – Premixed liquid, thixotropic (ready for use) Form V – Premeasured powder, thixotropic (ready for use after addition of water) Form VI – Premixed liquid (ready for touch-up use in self-contained applicator device) 1.2.4 Application methods. Chemical conversion materials are of the following application methods (see 6.2). Method A – Spray Method B – Brush-on or wipe-on Method C – Immersion Method D – Applicator pen or presaturated applicator device 1.3 Part or identifying number (PIN). PINs to be used for the chemical conversion materials for coating aluminum and aluminum alloys acquired to this specification are created as follows: M 81706 1 A 2 B Application method (see 1.2.4): A – Spray B – Brush C – Immersion D – Applicator Material form (see 1.2.3): 1 – Form I Concentrated liquid 2 – Form II Powder 3 – Form III Premixed liquid 4 – Form IV Premixed liquid 5 – Form V Premeasured powder 6 – Form VI Premixed liquid Class (see 1.2.2): A – Class 1A Maximum corrosion protection B – Class 3 Protection against corrosion where low electrical resistance is required Type (see 1.2.1): 1 – Type I Compositions with hexavalent chromium 2 – Type II Compositions with no hexavalent chromium Specification number M prefix 2 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. FEDERAL STANDARDS FED-STD-141 - Paint, Varnish, Lacquer and Related Materials: Methods of Inspection, Sampling and Testing DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-PRF-23377 - Primer Coatings: Epoxy, High-Solids MIL-PRF-85285 - Coating: Polyurethane, Aircraft and Support Equipment MIL-PRF-85582 - Primer Coatings: Epoxy, Waterborne (Copies of these documents are available online at http://assist.daps.dla.mil/quicksearch/ or www.dodssp.daps.mil or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) INTERNATIONAL ASTM-B117 - Salt Spray (Fog) Apparatus, Operating. (DoD adopted) ASTM-D3359 - Adhesion by Tape Test, Measuring (Copies of these documents are available from the ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or www.astm.org.) 3 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B SOCIETY OF AUTOMOTIVE ENGINEERS (SAE) INTERNATIONAL SAE-AMS4027 - Aluminum Alloy, Sheet and Plate, 1.0Mg-0.60Si-0.28Cu- 0.20Cr, (6061; -T6 Sheet, -T651 Plate), Solution and Precipitation Heat Treated. (DoD adopted) SAE-AMS4037 - Aluminum Alloy, Sheet and Plate, 4.4Cu-1.5Mg-0.60Mn, (2024; -T3 Flat Sheet; -T351 Plate), Solution Heat Treated. SAE-AMS4045 - Aluminum Alloy, Sheet and Plate, 5.6Zn-2.5Mg-1.6Cu- 0.23Cr, 7075: (-T6 Sheet, -T651 Plate), Solution and Precipitation Heat Treated. (DoD adopted) (Copies of these documents are available from the SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. The chemical conversion materials furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.5). 3.2 Coating materials. All ingredients used in the chemical conversion materials shall meet the requirements of this specification. Type I materials shall be formulated from hexavalent chromium compounds, other inorganic salts such as phosphates or fluorides, catalysts, activators, and accelerators. Type II materials shall be formulated from salts, catalysts, activators, and accelerators that contain no hexavalent chromium. The materials, in an aqueous solution, shall form a conversion coating nonelectrolytically. 3.3 Application. The material, after proper mixing, shall be a material selected for treatment of the prepared metal in accordance with the supplier s instructions, by spray, brush, immersion, or applicator (see 1.2.4 and 6.2). Class 1A material, furnished premixed in liquid forms III and IV shall be in the concentration required for treatment and shall require no further dilution. The conversion coating shall not be subjected to a surface temperature greater than 140 °F (60 °C) during drying or curing. After application, the coating shall be continuous and substantially free from powdery and loose areas. The coating shall also be free from breaks, scratches, flaws, or other defects that will reduce serviceability or be detrimental to appearance, protective value, or paint bonding characteristics. The material shall deposit a conversion coating visibly discernible in daylight. 4 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 3.4 Toxicity. The material and processing baths or solutions shall have no adverse effect on the health of personnel (see 6.5.2), when used for the intended purpose in accordance with local process specifications (see 6.1). 3.5 Performance characteristics. 3.5.1 Corrosion resistance. After testing in accordance with 4.5.1 for applicable salt spray exposure periods specified in table I, the specimens shall show no evidence of corrosion when compared to unexposed control panels using the naked eye. Areas within 0.25 inch (6.35 millimeters [mm]) from the edges of the panel, the identification markings, and the panel holding points during processing or salt spray exposure shall not be evaluated. Differences in color between the test panels and the control panels shall not be cause for rejection. TABLE I. Schedule for corrosion resistance properties of unpainted chemical films. Corrosion Resistance Inspection Class Aluminum Alloy To Be Conversion Coated Salt Spray Exposure (Hours) 1A 2024-T3, 7075-T6 1/ 336 Qualification 3 6061-T6 168 1A 2024-T3 168 Conformance 3 6061-T6 168 1/ Exposure time for class 1A, form VI, method D materials shall be 168 hours. 3.5.2 Paint adhesion (wet tape). After application of the epoxy polyamide primer in accordance with 4.4.4, no intercoat separation shall occur between the paint system, the conversion coating, or the base metal, when tested in accordance with 4.5.2. 3.5.3 Paint adhesion (wet tape) after repair (applies to nonimmersion methods). After panel repair and immersion in test fluid as specified in 4.5.3, the scribed panels shall exhibit no peelaway and be rated at not less than 4A in accordance with ASTM-D3359. There shall be no blistering of the unscribed coated area. 3.6 Coating weight (class 1A only). When tested in accordance with 4.5.4, type I coating weight shall be not less than 40 milligrams per square foot (430 milligrams per square meter) of surface area. Class 1A, type I, form VI, method D coating weight shall be not less than 10 milligrams per square foot of surface area (107.5 milligrams per square meter). Class 1A, type II coating weight shall be not less than 10 milligrams per square foot of surface area (107.5 milligrams per square meter). 3.7 Contact electrical resistance properties (class 3 only). When tested in accordance with 4.5.5, the contact electrical resistance of aluminum alloy panels treated with class 3 materials under an applied electrode pressure of 200 pounds per square inch (psi) shall be not greater than 5,000 microhms psi as applied and 10,000 microhms psi after salt spray exposure specified in 4.5.1. Individual readings not greater than 20 percent in excess of the specified maximums shall 5 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B be acceptable, provided that the average of all readings does not exceed the specified maximum resistance. 3.8 Vertical adherence weight (forms IV and V only). After testing in accordance with 4.5.6, forms IV and V shall have an average adherence weight of 2.8 to 6.5 grams. The materials shall cling uniformly to the test panel with no visual evidence of excessive runoff or lack of coverage. 3.9 Storage stability. The storage life of the materials conforming to this specification shall be not less than 12 months (see 6.7). Products for which storage stability is to be determined shall be furnished in containers as specified by the qualifying activity. Storage samples shall not be opened or agitated during the stipulated storage period. After storage, the product shall be homogeneous, free from precipitate (if a liquid product), be easily mixed or diluted, when required, and shall conform to all applicable requirements of this specification. Only those products that have been tested and initially found to meet all applicable requirements of this specification shall be evaluated for storage stability (see 4.5.7). 3.10 Unit of issue. To interface with existing equipment and system part lists and meet the required storage characteristics, the units of issue shall be as specified in 3.10.1 and 3.10.2. 3.10.1 Bulk materials. Form I unit of issue shall be one gallon, shipped in plastic lined containers of up to 55 gallon capacity. Form II unit of issue shall be one pound, shipped in plastic lined or plastic containers of up to 175 pound capacity. All containers shall be sealed to prevent moisture intrusion. 3.10.2 Ready-to-use or premeasured materials. Units of issue for forms III and IV shall be one pint or one quart plastic containers with plastic lined screw cap. Unit of issue for form V shall be one quart plastic container with plastic lined screw cap. The plastic container shall be marked with the powder level and the added liquid level. All containers shall be sealed to prevent moisture intrusion. Unit of issue for form VI, method D, shall be one applicator device. 3.11 Warning label. For type I, forms I through V, the following warning shall appear on each container: WARNING: Chemical conversion materials are strongly oxidizing and present a potential fire and explosion hazard when in contact with flammable materials such as paint thinners. Avoid storing or mixing these materials in containers that previously contained flammable products. Type II chemical conversion materials shall be labeled in accordance with Department of Transportation (DOT) or National Fire Protection Association (NFPA) regulations for solid and liquid compositions. 6 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 3.12 Instructions for use. All containers shall have specific instructions for mixing, using, and applying the chemical conversion materials. The instructions shall be either marked or labeled on the container, or included on an instruction sheet in a plastic envelope attached securely to the outside of the container. The methods and materials used to provide the marking or labeling, for all forms except form VI, shall be water-repellent to ensure that the instructions remain legible under the exposure conditions of the container. 3.13 Workmanship. The chemical conversion materials shall be uniform in composition and quality, and be free from impurities and other defects that impair usability and adversely affect performance. The chemical conversion materials furnished in this specification shall be identical in composition and coating characteristics to the qualification sample. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2). b. Conformance inspection (see 4.3). 4.2 Qualification inspection. Qualification inspection shall consist of all tests specified in table II. 4.2.1 Samples. The qualification test samples for application methods A, B, and C (see 1.2.4) shall consist of individual containers of premeasured material to make up the following: a. Four individual ten-gallon baths for immersion application. b. Four individual one-gallon baths for spray application. c. Four individual one-gallon baths for brush application. The qualification sample for application method D (see 1.2.4) shall consist of twelve applicator devices, ready for use. NOTE: The qualifying activity (see 6.5) does not measure any of the individual component chemicals. They only add water, if applicable, to the premeasured quantity (forms I, II, and V). The qualifying activity does, however, furnish the necessary test panels for qualification inspection. The samples shall be forwarded as directed in the letter of authorization (see 6.5) and be identified by securely attached tags marked with the following information: 7 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B Samples for qualification inspection CHEMICAL CONVERSION MATERIALS FOR COATING ALUMINUM AND ALUMINUM ALLOYS Name of manufacturer Manufacturing facility Product code number Batch number Date of manufacture Submitted by (name) (date) for qualification inspection in accordance with MIL-DTL-81706B under authorization of (reference authorizing letter). TABLE II. Qualification inspections. Inspection Class Alloys To Be Tested 1/ Number Of Panels 2/ Panel Identification Numbers 3/ Rqmt Para. Test Para. Corrosion 1A 2024-T3 5 1A through 6A 3.5.1 4.5.1 Resistance 7075-T6 5 1B through 6B 3 6061-T6 5 1C through 6C Electrical Contact Resistance After Salt Spray Exposure 3 6061-T6 5 4/ 1C through 5C 3.7 4.5.5 Electrical Contact Resistance Without Salt Spray Exposure 3 6061-T6 5 7C through 11C 3.7 4.5.5 Paint Adhesion 1A 2024-T3 2 7A and 8A 3.5.2 4.5.2 Initial 7075-T6 2 7B and 8B 3 6061-T6 2 12C and 13C Paint Adhesion 1A 2024-T3 18 9A through 26A 3.5.3 4.5.3 After Repair 5/ 7075-T6 18 9B through 26B Coating 1A 2024-T3 3 27A through 29A 3.6 4.5.4 Weight 7075-T6 3 27B through 29B Vertical Adherence of Thixotropic Forms (IV and V) 1A 7075-T6 3 30B through 32B 3.8 4.5.6 Storage Life 6/ --- --- --- --- 3.9 4.5.7 1/ 2024-T3, 7075-T6, and 6061-T6 shall conform to SAE-AMS4037, SAE-AMS4045, and SAE-AMS4027, respectively. 2/ Panel dimensions and preparations shall be in accordance with 4.4. 3/ Panels 6A, 6B, 6C shall be used as the corrosion resistance test control panels (unexposed to salt spray). 4/ Reuse class 3 salt spray panels for electrical contact resistance after salt spray exposure. 8 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 5/ Requirement for class 1A, form VI, method D materials only. 6/ Conduct all qualification inspections on material exposed to the storage life test. Do not repeat storage life test. 4.3 Conformance inspection. Conformance inspection shall consist of testing chemical conversion materials from each lot (see 4.3.1) to perform all inspections specified in table III. TABLE III. Conformance inspections. Inspection Class Alloys To Be Tested 1/ Number Of Panels To Be Tested 2/ Panel Identification Numbers 3/ Rqmt Para. Test Para. Corrosion 1A 2024-T3 5 1A through 6A 3.5.1 4.5.1 Resistance 3 6061-T6 5 1C through 6C Paint 1A 2024-T3 2 7A and 8A 3.5.2 4.5.2 Adhesion 3 6061-T6 2 12C and 13C Coating Weight 1A 2024-T3 3 9A through 11A 3.6 4.5.4 Vertical Adherence of Thixotropic Forms (IV and V) 1A 7075-T6 3 12B through 14B 3.8 4.5.6 1/ 2024-T3, 7075-T6, and 6061-T6 shall conform to SAE-AMS4037, SAE-AMS4045, and SAE-AMS4027, respectively. 2/ Panel dimensions and preparations shall be in accordance with 4.4. 3/ Panels 6A and 6C shall be used as the corrosion resistance test control panels (unexposed to salt spray). 4.3.1 Lot. Unless otherwise specified in the contract or purchase description (see 6.2), a lot of the chemical film material shall consist of one production run, produced by one manufacturer under the same processing conditions, without change in ingredients or ingredient lots and offered for delivery at one time (see 6.5.3). If the material cannot be identified by lot, a lot shall consist of not more than 1,500 gallons of liquid or 2,000 pounds of powder material offered for delivery at one time. 4.4 Preparation of test panels. 4.4.1 Alloys, required number of panels, identification markings, and dimensions. The alloys to be tested, the number of panels required for each test, and the identification marking for each panel are specified in table II for qualification testing and in table III for conformance inspection testing. Panel dimensions, after repair paint adhesion, shall be 5 x 3 x 0.032 inch (12.7 x 7.6 x 0.08 mm). All other panels shall be 10 x 3 x 0.032 inch (24.4 x 7.6 x 0.08 mm). 9 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B The aluminum used to fabricate the panels shall be free of pits, scratches, mill markings, or imperfections due to irregularity of heat treatments. 4.4.2 Panel cleaning. 4.4.2.1 Panel cleaning prior to conversion coating . Test panels shall be cleaned with materials that remove soil without damaging the metal. The panels shall be cleaned to remove oxides and all foreign substances. Acid solutions, when required, shall be used for removal of oxides and the characteristic surface smut. The panels shall be rinsed thoroughly with water prior to coating application. Abrasives containing iron, such as steel wool, iron oxide rouge, or steel wire are prohibited for all cleaning operations as particles from them may become embedded in the metal and accelerate corrosion. The panels shall be handled during all cleaning and subsequent treatments so that mechanical damage or contamination is avoided. 4.4.2.2 Vertical adherence panels (forms IV and V only). The 7075-T6 aluminum panels required for the vertical adherence shall be cleaned with an acetone rinse. The panels shall then be marked with a pencil line 4 inches (101 mm) from one end, prior to testing for vertical adherence in accordance with 4.5.6. 4.4.3 Conversion coating application. Panels prepared and cleaned in accordance with 4.4.1 and 4.4.2, except for class 1A, form VI, method D, shall be conversion coated on all surfaces in accordance with the manufacturer’s instructions. All panels shall be dried at temperatures between 70 to 90 °F (21 to 32 °C) for 24 hours prior to testing, except panels to be used for coating weight determination (see 4.5.4). For class 1A, form VI, method D, panels prepared and cleaned in accordance with 4.4.1 and 4.4.2 shall be conversion coated on one side in accordance with the manufacturer’s instructions. All panels shall be dried at ambient conditions for not less than 24 hours. Panels 1 through 5 exposed to salt spray shall have edges protected by wax or other method approved by the qualifying activity. 4.4.4 Panel finishing. 4.4.4.1 Paint adhesion panels. Test panels prepared, cleaned, and conversion coated in accordance with 4.4.1 through 4.4.3 shall be finished with one coat of a volatile organic compound (VOC) compliant epoxy-polyamide primer conforming to MIL-PRF-23377 and MIL-PRF-85582 to a dry film thickness of 0.0006 to 0.0009 inch (0.6 to 0.9 mil). Panels prepared from class 1A, form VI, method D, shall be air dried for 14 days before testing. All other panels shall be allowed to dry in accordance with the primer specification, prior to testing for paint adhesion in accordance with 4.5.2. 10 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 4.4.4.2 Paint adhesion panels (after repair). 4.4.4.2.1 Panels 9 through 17. Panels prepared, cleaned, and conversion coated in accordance with 4.4.1 through 4.4.3 shall be finished with one coat of epoxy primer conforming to MIL-PRF-23377. After the primer has dried for 5 hours, a polyurethane topcoat conforming to MIL-PRF-85285 shall be applied. Panels shall be air dried for 14 days before testing. 4.4.4.2.2 Panels 18 through 26. Panels prepared, cleaned, and conversion coated in accordance with 4.4.1 through 4.4.3 shall be finished with one coat of epoxy primer conforming to MIL-PRF-85582. After the primer has dried for 6 hours, a polyurethane topcoat conforming to MIL-PRF-85285 shall be applied. Panels shall be air dried for 14 days before testing. 4.5 Test methods. 4.5.1 Corrosion resistance. Panels prepared in accordance with 4.4 shall be used for corrosion resistance testing of class 1A and class 3 materials. The selected specimens shall be subjected to a 5 percent salt spray test in accordance with ASTM-B117, except that the significant surface shall be inclined 6 degrees from the vertical. Specimens being qualified or for lot acceptance (see 4.3.1) shall be exposed for the number of hours specified in table I. After exposure, specimens shall be cleaned in running water with a temperature not greater than 100 °F (38 °C), blown with clean dry unheated air, and compared with the unexposed specimen for the presence of corrosion to determine compliance with 3.5.1. Differences in color between test panels and unexposed control specimens shall not be cause for rejection. Specimens from class 3 material, after exposure and cleaning, shall be allowed to air dry for 24 hours at room temperature before testing for contact electrical resistance properties in accordance with 4.5.5 for compliance with 3.7. 4.5.2 Paint adhesion (wet tape). Panels prepared in accordance with 4.4.4.1 shall be tested for paint adhesion in accordance with FED-STD-141, Method 6301.3. 4.5.3 Paint adhesion (wet tape), after repair (applies to nonimmersion methods). 4.5.3.1 Repair procedure. Panels 9 through 26, finished as specified in 4.4.4.2, shall be abraded to a shiny substrate using a Scotch Brite wheel or pad (see 6.6), or equivalent, as approved by the qualifying activity. The abraded area shall be 4 square inches. The remainder of the topcoat shall be lightly abraded to accept refinish primer. Class 1A, form VI, method D material shall be applied to the abraded entire panel and conditioned in accordance with the manufacturer’s instructions. The entire surface of panels 9 through 17 and panels 18 through 26 shall be refinished as specified in the applicable section of 4.4.4.2. 11 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B 4.5.3.2 Immersion procedure. Painted panels shall be immersed in distilled water as follows: 3 panels of each substrate and finish for 24 hours at room temperature. 3 panels of each substrate and finish for 96 hours at 120 ±2 °F (49 ±1 °C). 3 panels of each substrate and finish for 168 hours at 150 ±2 °F (65.5 ±1 °C). Upon completion of the immersion period, the panels shall be removed from the water, dried using a clean, dry soft cloth, and be immediately evaluated as specified in 4.5.3.3. 4.5.3.3 Evaluation procedure. Panels prepared in accordance with 4.4.4.1 shall be tested for paint adhesion in accordance with FED-STD-141, Method 6301.3, except that the scribed area shall include the original paint, overlap area, and the repair area. 4.5.4 Coating weight (class 1A). Panels prepared as specified in 4.4.3 shall be tested as specified herein for conformance to the requirements in 3.6. For type I coatings, within 3 hours after applying the conversion coating, the panels shall be weighed to the nearest 0.1 milligram. The coating shall not be aged for more than 3 hours since it will become difficult to remove and the results will be inaccurate. Immediately after weighing, the specimens shall be immersed for 60 seconds in freshly made nitric acid solution, composed of equal parts by volume of concentrated nitric acid (70 percent HNO3) and deionized water, maintained at room temperature. Coating removal can be facilitated by brushing the specimen with a clean cotton swab. For type II coatings, the method specified for type I coatings shall be used, unless an alternative method is specified by the manufacturer. After removal of the conversion coating, the specimen shall be rinsed thoroughly in deionized or distilled water, blown dry with clean, filtered oil-free air, and reweighed. The weight of the chemical conversion film in milligrams per square foot shall be calculated as follows: Film Weight = (W1 - W2) x 2.4 for milligrams/ft2 (25.8 for milligrams per square meter) where: W1 = Initial weight in milligrams W2 = Final weight in milligrams 4.5.5 Contact electrical resistance (class 3 only). Panels prepared as specified in 4.4 (before and after the salt spray exposure [see 4.5.1]) shall have the contact electrical resistance of the coating determined for conformance to 3.7. Test equipment and circuitry as shown on figures 1 and 2 shall be used for measuring the electrical resistance of the class 3 material specimens. The applied load shall be within one percent of the calculated 200 psi applied pressure. The contacting electrodes shall be copper or silver-plated copper with a finish not rougher than that obtained by the use of 000 metallographic abrasive paper. The electrodes shall be flat enough so that when the load is applied without a specimen between them, light will not be visible through the contacting surface. The area of the upper electrode shall be one square inch (25 square mm) and the area of the lower electrodes shall be larger. Ten measurements shall be made on each panel in the areas shown on figure 3. 12 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B FIGURE 1. Sketch of equipment for measuring electrical resistance of chemical film. 13 Source: http://www.assistdocs.com -- Downloaded: 2011-01-07T09:44Z Check the source to verify that this is the current version before use. MIL-DTL-81706B FIGURE 2. Circuit diagram for contact resistance measurements.