1、/+/a43 MIL-R-46085B Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, S Army Materials and Mechanics Research Center, ATTN: DRXMR-SMS, Watertown, MA 02172 by using the self-addressed Sta
2、ndardization Document Improvement Proposal (DD Form 1426) appearing at the end of this docunent or by letter. 24 April 1984 SUPERSEDING MIL-R-46085A 23 March 1972 MILITARY SPECIFICATION RHODIUM PLATING, ELECTRODEPOSITED This specification is approved for use by all Department and Agencies of the Dep
3、artment of Def-ense. . 1. SCOPE 1.1 Scope. This specification covers the requirements for the electrodeposition of rhodium over metallic surfaces. 1.2 Classification. Rhodium plating shall be of the following classes, as specified (see 6.2 and 6.6): Class 1 - 0.000002 inch thick, minimum Class 2 - 0
4、.00001 inch thick, minimum Class 3 - 0.00002 inch thick, minimum Class 4 - 0.00010 inch thick, minimum Class 5 - 0.00025 inch thick, minimum 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. Unless otherwise specified, the following specifications. sta
5、ndards, and handbooks of the issue listed in that issue of the Department 4 3efense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. / AREA MFFP / NO DELIVERABLE DATA REQUIRED BY THIS DOCUMENT .- a Provided
6、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- NIL-R-46085B MF m 777790b 0420863 2 m MIL-R-46085B SPECIFICATIONS FEDERAL QQ-N-290 - Nickel Plating, Electrodeposited STANDARDS FEDERAL Fed. Test Method Std, No. 151 - Metals; Test Methods MILITARY MIL-STD-105
7、 - Sampling Procedures and Tables for Inspection by Attributes (Copies of specifications, standards, handbooks, drawings, and publications required by manufacturers in connection with specific acquisition functions should be obtained from the contracting aktivity or as directed by the contracting of
8、ficer , ) 2.2 Other publications, The following document(s) form a part of this specification to the extent specified herein, The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if applicable. AMERICAN SOCIETY FOR
9、 TESTING AND MATERIALS (ASTM) B 487 - Measuring Metal and Oxide Coating Thickness by Microscopical Examination of a Cross-Section. B 529 - Measurement of Coating Thickness by Eddy Current Test Method; Nonconductive Coatings on Nonmagnetic Basis Metals E 8 - Tension Testing of Metallic Materials (Cop
10、ies may be obtained from Ibc merican Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.) (Industry association specifications and standards are generally available for reference from libraries. They are also distributed among technical groups and using Federal age
11、ncies.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specification shall take precedence. 3, REQUIREMENTS 3.1 Preproduction sample. When specified in the invitation for bids, contract or order (see 6.2),
12、samples of electrodeposited rhodium, repre- sentative of the class to be furnished in accordance with this specification, shall be subject to preproduction inspection and approval prior to submission of lots for acceptance inspection. 3.2 Material. The material used shall produce deposits which meet
13、 the requirements of this specification. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-h085B NF 9999906 0920864 4 - MIL-R-46085B 3.3 General requirements. 3.3.1 Plating application, Unless otherwise specified in the contract or order, the p
14、lating shall be applied after all machining, brazing, welding, forming, and perf orating. of the article have been completed. 3.3.2 Stress relief treatment. All ferrous parts having a hardness of Rockwell C33 and above which are machined, ground, cold formed or cold straightened shall be given a hea
15、t treatment at a minimum of 190OC (3750F) for 3 hours or more prior to cleaning and plating for the relief of damaging residual tensile stresses. 3.3.3 EmErittlement relief. All ferrous parts having a hardness. of Rockwell C40 and higher shall be baked at a minimum of 190OC (375OF) for 3 hours or mo
16、re, within 4 hours after plating to provide hydrogen embrittlement relief. The baked parts, when tested as specified in 4.5.4, shall not crack or fail by fracture. Plated springs and other parts subject to flexure shall not be flexed prior to hydrogen embrittlenent relief treatment. . 3.4 Preparatio
17、n of surfaces for plating. Surfaces shall be electrocleaned or otherwise subjected to any cleaning process necessary to insure rhodium plating meeting the requirements specified herein. Unless specified otherwise, ferrous metals having a hardness of Rockwell C40 or higher shall not be cleaned cathod
18、ically or acid cleaned. 3.5 Underplating. Surfaces other than nickel, silver. gold or platinum shall be nickel plated (or nickel over copper plated as applicable) in accordance with QQ-N-290. An underplating of nickel shall be used when parts are of corrosion or heat resistant steels. The nickel pla
19、ting shall be of . . such a thickness that after rhodium plating, the drawing dimensions shall be met. The thickness of the underplating shall not be used in the determination of the rhodium plating as stated herein. 3.6 Thickness. Thickness of the plating shall be in accordance- with the requiremen
20、ts of the class specifiefi by the procuring agency (see 1.2). Unless otherwise specified, the minimum plating thickness shall be as specified on all visible surfaces which Lcrlt be touched by a ball 0.75 inch in diameter. 3.7 Coverage. The plating shall cover all surfaces as stated in 3.6 including
21、cornels, recesses and roots of threads. 3.8 Adhesion. The adhesion of the rhodium plating and any ,undercoat(s) shall be such that when testing in accordance with 4.5.2 and examined at a magnification of four diameters, neither the rhodium plating nor any electrodeposited undercoat shall show separa
22、tion from the basis metal or from each other at their common interfaces. 3.9 Finish. When required for reflective purposes, the plating shall be sufficiently smooth to give a reflectance of at least 75 percent when tested in accordance with 4.5.3 (see 6.2). The reflectance standard shall be as speci
23、fied by the procuring activity. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- NIL-R-46085B NF m O6 0420865 b m MIL-R-46085B * 3.10 iforkmanship. The plated articles shall be of smooth surface and free of cracks, streaks, burns, milkiness, poor c
24、overage, built-up edges, or any other defect which might adversely affect the use or function of the part, 4. QUALITY ASSURANCE PROVISIONS 4.1. Responsibility for inspection. Unless otherwise specified in the Except as otherwise contract or purchase order, the contractor is responsible for the perfo
25、rmance of all inspection requirements as specified herein. 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 the Government Governnent reserves the ri
26、ght to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure suppiies and services conform to prescribed requirements. The * 4.2 Classification of inspection. The inspection requirements specified herein are classified as follows : 1, 2.
27、Prep.roduc t ion sample inspect ion ( see 4.3). Lot acceptance inspection (see 4.4). 4.3 Preproduction sample inspection. When specified in the contract or order, prior to the production plating of any article, the contractor shall prepare preproduction samples representing the minimum acceptable pl
28、ating quality to be used in production. The preproduction sample shall Fe articles of the same basis metal and prepared for plating by similar procedures to those applying to the articles to be plated in production, The preproduction samples selected in accordance with 4.4.2 and 4.4.3 shall be subje
29、cted to all examination and tests specified herein. Equivalent substitute specimens may be used in lieu of the actual articles to be plated in production subject to the provisions of 4.4.3.1. Unless otherwise specified in the contract or order, the Government will perform the examinations and test f
30、or preproduction acceptance at the contractors plant, Preproduction samples which do not meet all the requirements of this specification shall be rejected and returned to the contractor. Before submitting another preproduction sample, full particulars c0nceri.li.F; previous rejection and the action
31、taken to correct the defects shall be made available to the contracting officer. Articles to be plated under this specification will not be considered for acceptance until approval of the preproduction samples has been obtained, 4.4 Lot acceptance inspection. Lot acceptance samples shall conform wit
32、h the samplinp procedures and tests specified herein. 4.4.1 - Lot. A lot shall consist of plated articles of the same class, of approximately the same size and shape, plated under the same conditions by the same contractor and submitted at one time for inspection. 4.4.2 Sampling for visual examinati
33、on. Unless otherwise specified in the contract or order, samples for visual examination shall be obtained in accordance with KtL-STD-105, inspection level III, AL (acceptable quality level) = 1.0 percent defective. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
34、e from IHS-,-,-MIL-R-qbO5B HF m 99799Ob 0420bb MIL-R-46085B 4.4.2.1 Visual examination. Samples selected in accordance with 4.4.2 shall be visually examined or compliance with the workmanship requirements (3.30). O 4.4.3 Sampling for thickness, adhesion, finish and enhrittlement relief. Unless other
35、wise specified in the contract or order, samples for thickness, adhesion, finish, and embrittlement relief shall be composed of a minimum of four plated articles selected at random from each lot. 4.4.3.1 Use of equivalent specimens. Unless otlierrise specified in the contract or order, equivalent sp
36、ecimens may be included in a lot as substitutes for plated articles that are not suited to the tests specified herein. Equivalent specimens shall be of the same basis metal; shall be prepared for plating in the same manner as the article it is to represent and shall be plated concurrently with the a
37、rticle. Controllable conditions that affect the plating should be as nearly as possible the same for the equivalent specimens as for the represented article. The substitute specimens shall be 1 by 4 by 0.04 inches. 4.5 Test procedures. 4.5.1 Thickness of plating. For nondestructive measuring of plat
38、ing thickness, procedures in accordance with Fed. Test Method No. 151, method 520 (electronic test) or ASTH B 529 (eddy current) may be used. For destructive measuring, the microscopic method in accordance with ASTM B 487 may be used. At the option of the supplier, other instruments such as those us
39、ing the principle of beta radiation back scatter or x-ray fluorescence may be used. For plating thickness less than 0.0001 inch, microscopic, magnetic, or eddy current methods should not be used. O 4.5.2 Adhesion test. The samples shall De repeatedly bent through an angle of 180 degress on a diamete
40、r equal to the thickness of the specimen until fracture of the basis metal occurs. Following fracture, it shall not be possible to detach areas of the coating by use of a pointed instrument. If the edge of the ruptued plate can be peeled back or if separation between rhodium or underplating and the
41、basis metal, or any plating from each other can be seer. tiL the point of rupture, when examined at 4 diameters magnification, adhesion is not satisfactory. The formation of cracks that do . not result iri flaking or peeling of the deposit shall not be considered as nonconforming to this requirement
42、. 4.5.3 Finish test. When the rhodium plates surface is to bk tested for reflectivity, a device similar to the one shown in figure 1 shall be used. The angle of reflection and incidence shall be measured at 45 degrees plus or minus 2 degrees. A flat surface shall be used for reflectivity tests. 5 ._
43、 . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ MIL-R-ib0CB MF 9 9999906 0420b7 T 9 MIL-R-46085B 4.5.4 Embrittlement relief. Samples of parts as specified in 4.4.3, which will be subjected to sustained tensile ioad in use, shall be subjected to
44、 a sustained tensile load equal to 80 + 5 percent of the tensile yield strength of the material. hours and then examined for cracks. The lot shall be rejected if any plated part develops cracks, Parts which require special fixtures, extreme loads to comply with the above requirements, or where maxim
45、um design yield load is not known, may be represented by separate specimens, in accordance with figure 8 of ASTM E 8. The notched specimens shall be subjected to a sustained tensile load equal to 75% of the ultimate notch tensile strength of the material. held under load for at least 200 hours and t
46、hen examined for cracks or fracture. The parts shall be held under the load for at least 100 The configuration shall be The articles, parts or specimens shall be 4.6 Rejection. 4.6.1 Examination for defects. Any sample unit having one or more defects If the number of nonconforming sample units in th
47、e sample shall be rejected, exceeds the accpetance number specified in 4.4.2, the entire lot shall be rejected . 4.6.2 Thickness, adhesion, finish and embrittlement relief tests. A lot shall be rejected for failure to meet any of the test requirements when tested in accordance with 4.5. 4.7 Retest.
48、Individual plated articles or lots of plated articles rejected as defective may be reprocessed and resubmitted for testing under conditions specified by the procuring agency. 5. PACKAGING 5.1 Packaging Requirements. Preparation for delivery shall be as specified by the detailed specification coverin
49、g the item or order. If there are not detailed specifications, preparation for delivery shall be as specified in the costract or order. 6. NOTES 6.1 Intended use. Rhodium plating of metallic parts is intended to protect articles from corrosion, prevent galling of sliding electrical contacts, furnish a highly decorative finish and provide a mirror surface which is highly reflective and non-tarnishing. 6 Provided by IHSNot for ResaleNo reproduction or network
