1、 MIL-DTL-45204D 29 June 2007 _ SUPERSEDING MIL-G-45204C 7 June 1983 w/AMENDMENT 39 June 1993 DETAIL SPECIFICATION GOLD PLATING, ELECTRODEPOSITED This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers electrod
2、eposited gold plating on metallic surfaces (see 6.1). 1.2 Classification. Gold plating will be furnished in the following types, classes, and hardness grade as specified (see 6.2). 1.2.1 Types. The following types will contain the minimum level (purity) of gold as specified in Table I. 1.2.2 Grades.
3、 The grades listed in Table II are assigned to the above types. If the hardness grade for the gold coating is not specified in the contract or purchase order, then Type I will be furnished at hardness Grade A and Type II will be furnished at hardness Grade C. 1.2.3 Purity (Type) and Hardness (Grade)
4、 relationship. The purity and hardness combinations will be as designated in Table III. AMSC N/A AREA MFP Comments, suggestions, or questions on this document should be addressed to: Director, U.S. Army Research Laboratory, Weapons and Materials Research Directorate, Materials Applications Branch, S
5、pecifications and Standards Office, Attn: AMSRD-ARL-WM-MC, Aberdeen Proving Ground, MD 21005-5069 or emailed to rsquillaarl.army.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil/.
6、INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45204D 2TABLE I. Types. Type Minimum Gold Percent Type I 99.7 percent Type II 99.0 percent Type III 99.9 percent TABLE II. Grades. Grade Hardness (Knoop) Grade A 90 max. Grade B 91 12
7、9, incl. Grade C 130 200, incl. Grade D 201 and over. TABLE III. Purity vs. hardness. Purity (Type) Hardness (Grades) Type I A, B, or C Type II B, C, or D Type III A (only) 1.2.4 Classes. Unless otherwise specified in the contract or purchase order (see 6.2), the thickness will conform to the class
8、designation specified in Table IV. TABLE IV. Minimum class thickness. Class Minimum Thickness (Inches) Class 00 0.00002 Class 0 0.00003 Class 1 0.00005 Class 2 0.00010 Class 3 0.00020 Class 4 0.00030 Class 5 0.00050 Class 6 0.00150 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this se
9、ction are specified in sections 3, 4, or 5 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 Provided by IHSNot for ResaleNo reproduction or networ
10、king permitted without license from IHS-,-,-MIL-DTL-45204D 3ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2
11、.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks 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. DEPARTMENT OF DEFENSE STANDARDS
12、MIL-STD-202 - Test Method Standard Electronic and Electrical Component Parts MIL-STD-1916 - DoD Preferred Methods for Acceptance of Product (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, B
13、uilding 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 Quality (ASQ
14、) ASQC-A8402 - Quality Management and Quality Assurance - Vocabulary (DoD Adopted) (Copies of this document are available from www.asq.org or American Society for Quality, 600 Plankinton Avenue, Milwaukee, WI 53203.) ASTM INTERNATIONAL ASTM B487 - Metal and Oxide Coating Thickness by Microscopical E
15、xamination of a Cross Section, Measurement of. (DoD Adopted) ASTM B567 - Measurement of Coating Thickness by the Beta Backscatter Method (DoD Adopted) ASTM B568 - Measurement of Coating Thickness by X-Ray Spectrometry (DoD Adopted) ASTM B578 - Coatings, Electroplated, Microhardness of (DoD Adopted)
16、ASTM E8 - Materials, Metallic, Tension Testing of (DoD Adopted) ASTM E384 - Materials, Microindentation Hardness of (DoD Adopted) (Copies of these documents are available from www.astm.org or ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.) Provided by IHSNo
17、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45204D 4INTERNATIONAL STANDARDIZATION AGREEMENTS ISO 17025 - General requirements for the competence of testing and calibration laboratories (DoD Adopted) (Copies of this document are available from http:/www.is
18、o.ch or from the International Organization for Standardization American National Standards Institute 11 West 42nd Street, 13th Floor New York, New York, United States, 10036.) 2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the
19、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 Plating materials and processes. The materials and processes used shall produce coatings that meet the requirements
20、 of this specification. Either bright or matte deposits are acceptable unless otherwise specified in the contract or purchase order (see 6.2). 3.2 Basis metal. The basis metal shall be free from defects, scratches, pits, non-conducting inclusions, and roll and die-marks that will adversely affect th
21、e appearance and the performance of coatings applied thereto despite the observance of the best plating practice. 3.2.1 Preplating operations. Unless otherwise specified in the contract or purchase order (see 6.2), plating shall be applied after all basis metal heat treatments and mechanical operati
22、ons such as machining, brazing, welding, forming, and impregnating have been completed. This requirement does not prohibit certain required operations after plating to take place, such as, embrittlement relief, heat treatment and forming operations such as crimping electrical connections. 3.2.1.1 Pl
23、ating of steel parts. Unless otherwise specified in the contract or purchase order (see 6.2), steel parts having an ultimate tensile strength of 220,000 psi or above shall not be plated without specific approval from the procuring activity. 3.2.2 Stress relief treatment. All steel parts shall be giv
24、en a stress relief heat treatment at a range of 375 25 F (191 14 C) for 3 hours or more prior to cleaning and plating if they contain tensile stresses caused by machining, grinding, or cold forming operations. Parts which are cold straightened are considered to contain damaging stresses. The tempera
25、ture and time at temperature shall be such that maximum stress relief is obtained without reducing the hardness below the specified minimum (see 6.2.1). 3.3 Pretreatment. Articles shall be cleaned, pickled, or otherwise pretreated as necessary. Acid pickling on high strength steels shall be prohibit
26、ed. 3.4 Strikes. When gold plating is preceded by a strike or a strike and underplate, it shall be as specified in the contract or purchase order (see 6.2 and 6.3). For exterior use and when the basis Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M
27、IL-DTL-45204D 5metal is low alloy steel or other non-copper base metal such as zinc, the thickness of the strike and underplate shall be a minimum of 0.001 inch minus the thickness of the specified gold plating. Unless otherwise specified in the contract or purchase order (see 6.2), gold over silver
28、 underplate combinations shall be excluded from electronic hardware. Silver or copper plus silver may not be used as an underplate unless required by item specification. Also, when gold is applied to a copper rich surface such as brass, bronze or beryllium copper or a copper plate or strike, an anti
29、-diffusion underplate such as nickel shall be applied. 3.5 Plating equipment and processes. Unless otherwise specified in the contract or purchase order (see 6.2), the plating equipment and process used shall be at the option of the supplier (see 6.2.1). 3.6 Plating properties. 3.6.1 Thickness. The
30、minimum thickness of deposited gold on significant surfaces for each class of gold plating shall be as shown in 1.2.3. Significant surfaces shall be all surfaces of the article which can be touched by a sphere 0.75 inch in diameter plus additional functional surfaces specified on the applicable draw
31、ings, contract or purchase order (see 6.2). However, the plating on non-significant, nonfunctional surfaces shall be of sufficient thickness to ensure plating continuity and uniform appearance. 3.6.2 Adhesion. Adhesion of the gold plating and of any underplating shall be such that the coating and un
32、dercoating shall not separate from each other or from the basis metal when tested according to 4.6.2. 3.6.3 Hardness. The Knoop hardness of the coating shall conform to the grade as specified in the contract or purchase order (see 1.2.2 and 6.2) and shall be determined in accordance with 4.6.3. 3.6.
33、4 Heat resistance. When heat resistance is specified, gold plated parts shall show no blistering, discoloration, or visible white or crystalline film when tested in accordance with 4.6.4. 3.6.5 Smoothness. If a degree of surface smoothness of the finished article is required, the degree shall be spe
34、cified in the contract or purchase order (see 6.2). Methods for measuring surface smoothness shall be approved by the procuring activity. 3.6.6 Solderability. When solderability is required by the procuring activity or specified in the contract or purchase order (see 6.2), the gold plating shall mee
35、t the following solderability requirements. When the gold plating is subjected to the solderability test of 4.6.5, the solder coating shall be even, free from lumps and shall not flake or peel when subjected to the adhesion test of 4.6.2. 3.6.7 Composition. The type (purity) of gold shall be as spec
36、ified in the contract or purchase order (see 1.2.1 and 6.2). 3.6.7.1 Impurities. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45204D 63.6.7.1.1 Type I, grade A and type III. Metallic impurities such as chromium, copper, tin, lead, silver,
37、cadmium, or zinc shall not be present in the deposit at a concentration greater than 0.1 percent. The percent by weight of iron, nickel, and cobalt combined shall be less than 0.050 and no one of these three elements shall be present in amounts greater than 0.030 percent by weight. 3.6.7.1.2 Type I,
38、 grades B and C and type II. Individual metallic impurities in the deposit shall not exceed 0.1 percent. Metallic hardening agents, which are purposely added to a bath are not to be considered impurities. 3.7 Postplating procedures. 3.7.1 Removal of plating salts. Residual plating salts shall be rem
39、oved from the plated articles. Articles difficult to clean, as spot-welded articles or other prefabricated articles with lap seams or joints, shall be cleaned after plating in well-agitated hot water (200 to 212 F). If any blisters appear after cleaning, the plated article shall be considered defect
40、ive. 3.7.2 Heating of hardened parts (embrittlement relief). All steel parts having a hardness of Rockwell C40 and higher shall be baked at 375 25 F (191 14 C) for 3 hours or more, within one hour after plating to provide hydrogen embrittlement relief. Plated springs or other parts subject to flexur
41、e shall not be flexed prior to baking operations. No plated part shall develop cracks or fail by fracture (see 4.6.6). 3.8 Workmanship. Gold plating shall be smooth, fine grained, adherent and free from exposed basis metal or underplate, visible blisters, pits, nodules, porosity, indications of burn
42、ing, excessive edge buildup and other detrimental defects. Correction of a burned condition by burnishing or tumbling is not acceptable. 3.9 Identification marking. When specified in the contract or purchase order (see 6.2), the plated articles shall be marked with a fluid which is not affected by w
43、ater and which shall not rub off or smear during shipment or storage, or shall carry a tag giving the following information: (a) The basis metal. (b) The type of gold plating. (c) The grade of gold plating. (d) The class of gold plating. (e) The number of this specification. (f) Strike, if used. (g)
44、 Underplate, if used. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as conformance inspection (see 4.2). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-45204D 74.2 Conformance
45、inspection. The supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified (see 6.2), the supplier may utilize his own or any other inspection facilities and services acceptable to the Government. Inspection records of the examinatio
46、n and tests shall be kept complete and available to the Government as specified in the contract or order (see 6.2). The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure that supplies and services conf
47、orm to prescribed requirements. 4.2.1 Inspection terms and definitions. Reference shall be made to ASQCA8402 to define the inspection terms used. 4.2.2 Inspection conditions. Unless otherwise specified (see 6.2), all inspections shall be performed in accordance with ISO 17025. 4.3 Lot. A lot shall c
48、onsist of articles of the same basis metal, type, grade, and class, plated under the same conditions and of approximately the same size and shape, submitted for delivery at one time. 4.4 Sampling. 4.4.1 Submittal of product. Unless otherwise specified in the contract or purchase order (see 6.2), the
49、 contractor shall submit the product in accordance with MIL-STD-1916. 4.4.2 Visual examination. A representative sample from each lot shall be selected for examination of visual characteristics in accordance with MIL-STD-1916. The specific acceptance level shall be specified in the contract or purchase order (see 6.2). All nonconforming material shall be rejected. 4.4.
