ASTM B984-2012 Standard Specification for Electrodeposited Coatings of Palladium- Cobalt Alloy for Engineering Use《工程用钯钴铝电解沉积镀层的标准规格》.pdf
《ASTM B984-2012 Standard Specification for Electrodeposited Coatings of Palladium- Cobalt Alloy for Engineering Use《工程用钯钴铝电解沉积镀层的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM B984-2012 Standard Specification for Electrodeposited Coatings of Palladium- Cobalt Alloy for Engineering Use《工程用钯钴铝电解沉积镀层的标准规格》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B984 12Standard Specification forElectrodeposited Coatings of Palladium- Cobalt Alloy forEngineering Use1This standard is issued under the fixed designation B984; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 palladium-cobalt alloy coatings containing approxima
3、tely80% of palladium and 20% of cobalt. Composite coatingsconsisting of palladium-cobalt with a thin gold overplate forapplications involving electrical contacts are also covered.Palladium and palladium-cobalt remain competitive finishesfor high reliability applications.1.2 PropertiesPalladium is th
4、e lightest and least noble ofthe platinum group metals (1)2. IIt has the density of 12 gm percubic centimeter, specific gravity of 12.0, that is substantiallylower than the density of gold, 19.29 gm per cubic centimeter,specific gravity 19.3, and platinum 21.48 gm per cubiccentimeter, specific gravi
5、ty 21.5. The density of cobalt on theother hand is even less than palladium. It is only 8.69 gm percubic centimeter, specific gravity 8.7. This yields a greatervolume or thickness of coating and, consequently, some savingof metal weight and reduced cost. Palladium-cobalt coatedsurface provides a har
6、d surface finish (ASTM E18) thusdecreasing wear and increasing durability. Palladium-cobaltcoated surface also has very low coefficient of friction 0.43compared to hard gold 0.60 thus providing lower mating andunmating forces for electrical contacts (1)2. Palladium-cobalthas smaller grain size (ASTM
7、 E112), 50 150 Angstroms,compared to Hard Gold 200 250 Angstroms (1)2.515nanometer, compared to hard gold 20 25 nanometer (1)2.Palladium-cobalt has low porosity (ASTM B799) 0.2 porosityindex compared to hard gold 3.7 porosity index (1)2.Palladium-cobalt coated surface has higher ductility (ASTMB489)
8、 3-7 than that of hard gold 3 (1)2. The palladium-cobaltcoated surface is also thermally more stable 395C than hardgold 150C, and silver 170C. The following Table 1 comparesthe hardness range of electrodeposited palladium-cobalt withother electrodeposited noble metals and alloys (3,4).2TABLE 1 - Har
9、dness of Noble MetalsApproximate Hardness (HK25)Gold 50250Palladium 75600Platinum 150550Palladium-Nickel 300650Palladium-Cobalt 500650Rhodium 7501100Ruthenium 60013001.3 UnitsThe values stated in SI units are to be regardedas standard. No other units of measurement are included in thisstandard.1.4 T
10、his 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. Some specifichazard
11、s statements are given in Section 7 on Hazards.2. Referenced Documents2.1 ASTM Standards:3B183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Preparation of High-Carbon Steel for Elec-troplatingB254 Practice for Preparation of and Electroplating onStainless SteelB281 Pr
12、actice 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 NickelB374 Terminology Relating to ElectroplatingB481 Practice for Preparation of Tita
13、nium 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 Section1This specification is under the jurisdiction of ASTM Committee B0
14、8 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.08.02 on Precious Metal Coatings.Current edition approved May 1, 2012. Published September 2012. DOI:10.1520/B0984-122The boldface numbers in parentheses refer to the list of references at the end ofthis specific
15、ation.3For 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.Copyright ASTM International, 100 Barr Harbor Drive, PO
16、 Box C700, West Conshohocken, PA 19428-2959. United States1B488 Specification for Electrodeposited Coatings of Goldfor Engineering UsesB489 Practice for Bend Test for Ductility of Electrodepos-ited and Autocatalytically Deposited Metal Coatings onMetalsB499 Test Method for Measurement of Coating Thi
17、cknessesby the Magnetic Method: Nonmagnetic Coatings onMagnetic Basis MetalsB507 Practice for Design of Articles to Be Electroplated onRacksB542 Terminology Relating to Electrical Contacts and TheirUseB558 Practice for Preparation of Nickel Alloys for Electro-platingB567 Test Method for Measurement
18、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 CoatingsB679 Specification for Electrodeposit
19、ed Coatings of Palla-dium for Engineering UseB689 Specification for Electroplated Engineering NickelCoatingsB697 Guide for Selection of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB741 Test Method for Porosity In Gold Coatings On MetalSubstrates By Paper Electrogr
20、aphy (Withdrawn 2005)4B748 Test Method for Measurement of Thickness of Metal-lic Coatings by Measurement of Cross Section with aScanning Electron MicroscopeB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsB765 Guide for Selection of Porosity and Gross Defect Testsfor Electrode
21、posits and Related Metallic CoatingsB799 Test Method for Porosity in Gold and PalladiumCoatings by Sulfurous Acid/Sulfur-Dioxide VaporB809 Test Method for Porosity in Metallic Coatings byHumid Sulfur Vapor (“Flowers-of-Sulfur”)D1125 Test Methods for Electrical Conductivity and Resis-tivity of WaterD
22、3951 Practice for Commercial PackagingE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE112 Test Methods for Determining Average Grain Size3. Terminology3.1 DefinitionsMany terms used in this specification aredefined in Terminology B374 or B542.3.2 Definitions of Terms Specific to This S
23、tandard:3.2.1 underplating, na metallic coating layer between thebasis metal or substrate and the topmost metallic coating. Thethickness of underplating is usually greater than 1 m. For highenergy electrical contact the thickness may be 2.0 4.0 m.3.2.2 significant surfaces, ndefined as those normall
24、yvisible (directly or by reflector) or essential to the serviceabilityor function of the article. Can be the source of corrosionproducts or tarnish films that interfere with the function ordesirable appearance of the article. The significant surfacesshall be indicated on the drawings of the parts or
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