ASTM B994 B994M-2015 Standard Specification for Nickel-Cobalt Alloy Coating《镍-钴合金涂层的标准规格》.pdf
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1、Designation: B994/B994M 15Standard Specification forNickel-Cobalt Alloy Coating1This standard is issued under the fixed designation B994/B994M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in
2、parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification describes the requirements forcorrosion-resistant coatings of electrodeposited nickel-cobalton metallic substrates and electro
3、deposited nickel-cobalt usedfor electroforming.NOTE 1The nickel-cobalt alloy is principally deposited as a coatingon steel products. It can also be electrodeposited on iron, stainless steel,aluminum, titanium and any other metal substrate.NOTE 2The nickel-cobalt alloy coating has a low coefficient o
4、ffriction of 0.08 that provides a dry lubricant on part surfaces that are incontact with each other and are subject to galling.1.2 This specification incorporates an accelerated exposuretest method to evaluate the effects of corrosion and galling onthe coating, and incorporates a means of reporting
5、the results tothe purchaser.1.3 The specification incorporates a classification schemethat establishes service conditions for thickness, classes ofdeposits based on the level of monitoring, and type based onsupplemental coatings used after deposition.1.4 The coating thickness ranges from 5 to 30 m,
6、and itcan be applied to machined parts, springs, latches, threadedparts, fasteners, etc. The deposit can also be used to electro-form parts requiring high strength with the alloy being main-tained at 50% nickel-cobalt.1.5 The nickel-cobalt alloy is used to protect ferrous metalsin contact with corro
7、sive environments such as: oil and gasproduction facilities, costal marine, andACQ (Alkaline CopperQuaternary) treatments for wood treatments.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equiva
8、lents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of
9、this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.8 This standard has been revised to comply with theRestriction of Hazardous Substances RoHS Requirements thatseek to limit the exposure of workers and the pub
10、lic to toxicmetals. The nickel-cobalt alloy does not contain any of the sixRestricted Hazardous Substances.2. Referenced Documents2.1 ASTM Standards:2A193/A193M Specification for Alloy-Steel and StainlessSteel Bolting for High Temperature or High PressureService and Other Special Purpose Application
11、sA194/A194M Specification for Carbon and Alloy Steel Nutsfor Bolts for High Pressure or High Temperature Service,or BothA681 Specification for Tool Steels AlloyB117 Practice for Operating Salt Spray (Fog) ApparatusB183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Prep
12、aration of High-Carbon Steel for Elec-troplatingB254 Practice for Preparation of and Electroplating onStainless SteelB320 Practice for Preparation of Iron Castings for Electro-platingB322 Guide for Cleaning Metals Prior to ElectroplatingB368 Test Method for Copper-Accelerated Acetic Acid-SaltSpray (
13、Fog) Testing (CASS Test)B374 Terminology Relating to ElectroplatingB568 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
14、tion of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic Coatings1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subco
15、mmittee B08.03 onEngineering Coatings.Current edition approved March 1, 2015. Published March 2015. DOI: 10.1520/B0994_B0994M15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informatio
16、n, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1B849 Specification for Pre-Treatments of Iron or Steel forReducing Risk of Hydrogen EmbrittlementB850 Guide for Post-Co
17、ating Treatments of Steel for Reduc-ing the Risk of Hydrogen EmbrittlementD1193 Specification for Reagent WaterE2465 Test Method for Analysis of Ni-Base Alloys byWavelength Dispersive X-Ray Fluorescence SpectrometryF519 Test Method for Mechanical Hydrogen EmbrittlementEvaluation of Plating/Coating P
18、rocesses and Service En-vironmentsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionG59 Test Method for Conducting Potentiodynamic Polariza-tion Resistance MeasurementsG85 Practice for Modified Salt Spray (Fog) TestingG102 Practice for Calculation of
19、 Corrosion Rates and Re-lated Information from Electrochemical MeasurementsG193 Terminology and Acronyms Relating to Corrosion2.2 ISO Standard:3ISO/IEC 17025:2005 General Requirements for the Compe-tence of Testing and Calibration Laboratories3. Terminology3.1 DefinitionsDefinitions of terms used in
20、 this specifica-tion are in accordance with Terminologies B374 and G193.4. Classification4.1 The coatings of nickel-cobalt have been classified asfollows: service condition by thickness, class by test methodsrequired, and type by secondary treatments.4.2 Service Condition (SC)This number signifies t
21、hethickness requirement based on the type of environment anddesired mechanical properties.NOTE 3The 50% NiCo alloy produces a high strength alloy that isused in electroforming to manufacture parts. These deposits can be usedat various thicknesses ranging from 1 m to hundreds of microns.4.2.1 SC5 sig
22、nifies that the application is slightly corrosiveand that a minimum 5 m of coating is sufficient for protectionand to provide the mechanical properties.4.2.2 SC12 signifies that the application is mildly corrosiveand that a minimum 12 m of coating is sufficient to protectagainst corrosion and provid
23、e the mechanical properties.4.2.3 SC18 signifies that the application is corrosive andthat a minimum of 18 m of coating is sufficient to protectagainst corrosion and provide the mechanical properties.4.2.4 SC25 signifies that the application is corrosive andthat a minimum 25 m of coating is sufficie
24、nt to protect againstcorrosion and provide the mechanical properties.4.3 ClassThis number signifies the type and frequency oftesting and monitoring programs that are used to control theprocess.4.3.1 Class 1Incorporates these standard tests: Galling(see Appendix X1) , Composition (see 9.3), Test Meth
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