ASTM_B_634_-_14a.pdf

Designation:B63414aStandard 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 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.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 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 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 Preparation 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 Conversion CoatingsB322 Guide for Cleaning Metals Prior to ElectroplatingB343 Practice for Preparation of Nickel for Electroplatingwith NickelB456 Specification for Electrodeposited Coatings of CopperPlus Nickel Plus Chromium and Nickel Plus ChromiumB481 Practice for Preparation of Titanium and TitaniumAlloys for ElectroplatingB482 Practice for Preparation of Tungsten and TungstenAlloys for ElectroplatingB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB507 Practice for Design of Articles to Be Electroplated onRacksB567 Test Method 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 Selection 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 Nickel Plating,Electrodeposited31This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.04 on Precious Metal Coatings.Current edition approved Nov.1,2014.Published November 2014.Originallyapproved in 1978.Last previous edition approved in 2014 as B634 14.DOI:10.1520/B0634-14A.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.Classification3.1 Electrodeposited coatings of rhodium on the basis ofthickness are classified as follows:ClassMinimum Thickness,m0.050.050.250.250.50.5112.52.56.256.25NOTE1Previous revisions of B634 included Class 6.2.Any require-ments for B634 Class 6.2 shall be required to meet the same requirementsnow within Class 6.25.4.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 governing 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),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 quality assurance(S1.2).5.Process Requirements5.1 Preparatory ProceduresThe basis metal shall be sub-jected to such cleanin