ASTM B634-1988(2009) Standard Specification for Electrodeposited Coatings of Rhodium for Engineering Use《工程用铑电解沉积镀层的标准规范》.pdf
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1、Designation: B634 88 (Reapproved 2009)Standard Specification forElectrodeposited Coatings of Rhodium for Engineering Use1This standard is issued under the fixed designation B634; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers requirements for electrodepos-ited coatings of rhodium used for engineering purposes
3、.1.2 Coatings of rhodium covered by this specification areusually employed for their corrosion resistance, stable electri-cal contact resistance, wear resistance, reflectivity, and heatresistance.1.3 Appendix X1 covers some typical applications forelectrodeposited rhodium.1.4 The values stated in SI
4、 units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health
5、practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 The following documents form a part of this documentto the extent referenced herein.2.2 ASTM Standards:2B183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Prepa
6、ration of High-Carbon Steel for Elec-troplatingB252 Guide for Preparation of Zinc Alloy Die Castings forElectroplating and Conversion CoatingsB254 Practice for Preparation of and Electroplating onStainless SteelB281 Practice for Preparation of Copper and Copper-BaseAlloys for Electroplating and Conv
7、ersion CoatingsB322 Guide for Cleaning Metals Prior to ElectroplatingB343 Practice for Preparation of Nickel for Electroplatingwith NickelB456 Specification for Electrodeposited Coatings of Cop-per Plus Nickel Plus Chromium and Nickel Plus Chro-miumB481 Practice for Preparation of Titanium and Titan
8、iumAlloys for ElectroplatingB482 Practice for Preparation of Tungsten and TungstenAlloys for ElectroplatingB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination of CrossSectionB507 Practice for Design of Articles to Be Electroplated onRacksB567 Test Method
9、 for Measurement of Coating Thicknessby the Beta Backscatter MethodB568 Test Method for Measurement of Coating Thicknessby X-Ray SpectrometryB571 Practice for Qualitative Adhesion Testing of MetallicCoatingsB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB697 Guide for Selec
10、tion of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsE8 Test Methods for Tension Testing of Metallic Materials2.3 Military Standards:MIL-R-46085 Rhodium Plating, Electrodeposited3QQ-N-290 Nicke
11、l Plating, Electrodeposited33. Classification3.1 Electrodeposited coatings of rhodium on the basis ofthickness are classified as follows:Class Minimum Thickness, m0.05 0.050.25 0.250.5 0.5112.5 2.51This specification is under the jurisdiction of ASTM Committee B08 on and isthe direct responsibility
12、of Subcommittee B08.08.02 on Precious Metal Coatings.Current edition approved Sept. 1, 2009. Published November 2009. Originallyapproved in 1978. Last previous edition approved in 2004 as B634 88 (2004)1.DOI: 10.1520/B0634-88R09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, o
13、rcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1
14、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 6.254. Ordering Information4.1 To make application of this standard complete, thepurchaser needs to supply the following information to theseller in the purchase order or other gover
15、ning document:4.1.1 Name, designation, and year of issue of this standard,4.1.2 Class including a maximum thickness, if appropriate(3.1),4.1.3 Nature of substrate, for example, high strength steel,need for stress relief, undercoats, embrittlement relief (5.1, 5.2,5.3),4.1.4 Significant surfaces (6.2
16、),4.1.5 Appearance (6.3),4.1.6 Requirements and methods of testing for one or moreof the following requirements: need for and type of testspecimens (8.1); thickness (8.2); adhesion (8.3); absence ofembrittlement (8.4); reflectivity (8.5); and undercoats (S1.4),and4.1.7 Sampling plans (Section 7) and
17、 quality assurance(S1.2).5. Process Requirements5.1 Preparatory ProceduresThe basis metal shall be sub-jected to such cleaning procedures as are necessary to ensure asurface satisfactory for subsequent electroplating. Materialsused for cleaning shall have no damaging effects on the basismetal result
18、ing in pits, intergranular attack, stress corrosioncracking, or hydrogen embrittlement.NOTE 1For basis metal preparations, the following appropriateASTM standards are recommended: Practices B183, B242, B252, B254,B281, B322, B343, B481, and B482.5.2 Preplating Operations:5.2.1 Electroplating shall b
19、e applied after all basis metalheat treatments and mechanical operations such as forming,machining, and joining of the article have been completed.5.2.2 Stress Relief TreatmentAll steel parts having anultimate tensile strength of 1050 MPa (approximately 35 HRC)and above and that have been machined,
20、ground, cold formed,or cold straightened shall have heat treatment to 190 6 15Cfor a minimum of 5 h before cleaning and electroplating.5.3 Post-Plating Procedures:5.3.1 Embrittlement ReliefSteel parts having an ultimatetensile strength of 1200 MPa (approximately 38 HRC) orgreater shall be baked at 1
21、90 6 15C for a minimum of 8 hwithin 4 h after electroplating to provide hydrogen embrittle-ment relief. Steel parts having an ultimate tensile strengthgreater than 1300 MPa (approximately 40 HRC) shall be bakedat 190 6 15C for a minimum of 23 h within 4 h afterelectroplating.6. Coating Requirements6
22、.1 Nature of CoatingThe coating shall be essentiallypure rhodium produced by electrodeposition from aqueouselectrolytes.6.2 ThicknessThe rhodium coating thickness on all sig-nificant surfaces shall conform to the requirements of thespecified class as defined in Section 3.6.3 Significant SurfacesSign
23、ificant surfaces are defined asthose normally visible (directly or by reflection) or are essentialto the serviceability or function of the article or which can bethe source of corrosion products or tarnish films that interferewith the function or desirable appearance of the article. Whennecessary, t
24、he significant surfaces shall be indicated on thedrawings of the parts, or by the provision of suitably markedsamples.NOTE 2Variation in the coating thickness from point-to-point on acoated article is an inherent characteristic of electroplating processes.Therefore, the coating thickness will have t
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