1、Designation:B994/B994M15Standard 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 parent
2、heses 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 electrodeposited
3、 nickel-cobalt usedfor electroforming.NOTE1The 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.NOTE2The nickel-cobalt alloy coating has a low coefficient offriction of 0
4、.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 the results tot
5、he 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,and itcan be appli
6、ed 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 corrosive environments such as
7、: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 equivalents;therefore,eachsystem shal
8、l 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 this standard to establish appro-pria
9、te 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 public to toxicmetals.The nickel-cobalt
10、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 ApplicationsA194/A194M Specification for Carbon an
11、dAlloy 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 Preparation of High-Carbon Steel for Elec-trop
12、latingB254 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(Fog)Testing(CASS Test)B374 Terminology Rela
13、ting 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 Selection of Sampling Plans for Inspectionof Elect
14、rodeposited 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 Subcommittee B08.03 onEngineering Coatings.Current
15、 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 information,refer to the standards Document Summary page onthe
16、ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 B849 Specification for Pre-Treatments of Iron or Steel forReducing Risk of Hydrogen EmbrittlementB850 Guide for Post-Coating 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 Em