MIL-DTL-45204D 29 June 2007 SUPERSEDING
MIL-G-45204C
7 June 1983 w/AMENDMENT 3 9 June 1993
DETAIL SPECIFICATION
GOLD PLATING, ELECTRODEPOSITED
This specification is approved for u by all Departments and Agencies of the Department of Defen.
1. SCOPE
1.1 Scope. This specification covers electrodeposited gold plating on metallic surfaces (e 6.1). 1.2 Classification. Gold plating will be furnished in the following types, class, and hardness grade as specified (e 6.2).
极速前进第四季1.2.1 Types. The following types will contain the minimum level (purity) of gold as specified in Table I.
1.2.2 Grades. 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 purcha order, then Type I will be furnished at hardness Grade A and Type II will be furnished at hardness Grade C.樱花飘落
1.2.3 Purity (Type) and Hardness (Grade) relationship. The purity and hardness combinations will be as designated in Table III.
AMSC N/A
AREA MFFP
TABLE I. Types.
Percent
新都桂湖公园Type Minimum
Gold
Type I 99.7 percent
Type II 99.0 percent
Type III 99.9 percent
TABLE II. Grades.
(Knoop)
Grade Hardness
Grade A 90 max.
Grade B 91 – 129, 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)说服教育法
1.2.4 Class. Unless otherwi specified in the contract or purcha order (e 6.2), the thickness will conform to the class designation specified in Table IV.
TABLE IV. Minimum class thickness.
Class Minimum Thickness (Inches)
Class 00 0.00002
Class 0 0.00003
关于安全的手抄报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 ction are specified in ctions 3, 4, or 5 of this specification. This ction does not include documents cited in other ctions 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 urs are cautioned that they must meet all specified requirements of documents cited in ctions 3, 4, or 5 of this specification, whether or not they are listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwi specified, the issues of the documents are tho cited in the solicitation or contract.
DEPARTMENT OF DEFENSE STANDARDS
MIL-STD-202 - Test Method Standard – Electronic and Electrical Component Parts
MIL-STD-1916 - DoD Preferred Methods for Acceptance of Product
(Copies of the documents are available online at assist.daps.dla.mil/quickarch/
东北交通大学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 otherwi specified, the issues of the documents are tho cited in the solicitation or contract.
American Society for Quality (ASQ)
ASQC-A8402 - Quality Management and Quality Assurance - Vocabulary
Adopted)
(DoD
(Copies of this document are available from www.asq or American Society for Quality, 600 Plankinton Avenue, Milwaukee, WI 53203.)
ASTM INTERNATIONAL
ASTM B487 - Metal and Oxide Coating Thickness by Microscopical
Section, Measurement of. (DoD Adopted)
Cross
a
of
Examination
ASTM B567 - Measurement of Coating Thickness by the Beta Backscatter
Adopted)
(DoD
Method
ASTM B568 - Measurement of Coating Thickness by X-Ray Spectrometry (DoD Adopted)
ASTM B578 - Coatings, Electroplated, Microhardness of (DoD Adopted) ASTM E8 - Materials, Metallic, Tension Testing of (DoD Adopted)
ASTM E384 - Materials, Microindentation Hardness of (DoD Adopted)
(Copies of the documents are available from www.astm or ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.)
INTERNATIONAL STANDARDIZATION AGREEMENTS
ISO 17025 - General requirements for the competence of testing and calibration
Adopted)
(DoD
laboratories
(Copies of this document are available from www.iso.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 text of this document takes precedence. Nothing in this document, however, superdes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Plating materials and process. The materials and process ud shall produce coatings that meet the requirements of this specification. Either bright or matte deposits are acceptable unless otherwi specified in the contract or purcha order (e 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 adverly affect the appearance and the performance of coatings applied thereto despite the obrvance of the best plating practice.
3.2.1 Preplating operations. Unless otherwi specified in the contract or purcha order (e 6.2), plating shall be applied after all basis metal heat treatments and mechanical operations 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 Plating of steel parts. Unless otherwi specified in the contract or purcha order (e 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 given a stress relief heat treatment at a range o
f 375° ± 25° F (191° ± 14° C) for 3 hours or more prior to cleaning and plating if they contain tensile stress caud by machining, grinding, or cold forming operations. Parts which are cold straightened are considered to contain damaging stress. The temperature and time at temperature shall be such that maximum stress relief is obtained without reducing the hardness below the specified minimum (e 6.2.1).
3.3 Pretreatment. Articles shall be cleaned, pickled, or otherwi pretreated as necessary. Acid pickling on high strength steels shall be prohibited.
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 purcha order (e 6.2 and 6.3). For exterior u and when the basis
metal is low alloy steel or other non-copper ba 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 otherwi specified in the contract or purcha order (e 6.2), gold over silver underplate combinations shall be excluded from electronic hardware. Silver or copper plus silver may not be ud 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-diffusion underplate such as nickel shall be applied.
3.5 Plating equipment and process. Unless otherwi specified in the contract or purcha order (e 6.2), the plating equipment and process ud shall be at the option of the supplier (e 6.2.1).星花木兰
3.6 Plating properties.
3.6.1 Thickness. The 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 drawings, contract or purcha order (e 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 undercoating shall not parate 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 purcha order (e 1.2.2 and 6.2) and shall be determined in accordance with
4.6.3.
3.6.4 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 specified in the contract or purcha order (e 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 purcha order (e 6.2), the gold plating shall meet 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.
最大的蝎子3.6.7 Composition. The type (purity) of gold shall be as specified in the contract or purcha order (e 1.2.1 and 6.2).
3.6.7.1 Impurities.
