1、Designation: B607 91 (Reapproved 2009)Standard Specification forAutocatalytic Nickel Boron Coatings for Engineering Use1This standard is issued under the fixed designation B607; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the y
2、ear 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 Nickel boron coatings are prod
3、uced by autocatalytic(electroless) deposition from aqueous solutions. These solu-tions contain either an alkylamineborane or sodium borohy-dride as a reducing agent, a source of nickel ions, a buffer,complexant, and control chemicals.1.2 This specificationdescribes the requirements for coat-ings of
4、autocatalytic nickel boron deposited from aqueoussolutions onto substrates for engineering use. The specificationclassifies these coatings into two types:1.2.1 Type 1 coatings have a boron content of 0.1 to lessthan 3.5 mass percent with the balance nickel.1.2.2 Type 2 coatings have a boron content
5、of 3.5 to 6 masspercent and a minimum of 90 mass percent nickel.1.3 The coatings are hard and uniform in thickness, even onirregular shaped parts, and used in a wide range of applications.1.4 Process solutions formulated with an alkylamineboraneusually produce coatings that contain 0.1 to 3.5 % boro
6、n. Thincoatings of this type provide bondability and solderability onelectronic components such as lead frames, electrical contacts,and headers. To maintain solderability, these coatings aregenerally not heat treated.1.5 Process solutions formulated with sodium borohydrideare strongly alkaline and a
7、re frequently used to plate steel andtitanium parts to impart surface hardness and wear resistanceproperties. Deposits produced from these processes can contain3 to 5 % boron and thallium or other metals which are used tostabilize the plating solution and modify the coating properties.1.6 The physic
8、al and mechanical properties of these depos-its such as density, hardness, stress, and melting point will varywith the boron content. The variation of boron content alsoaffects the quantity and structure of nickel boride precipitatedduring heat treatment. In the as-plated condition the depositconsis
9、ts of a predominantly amorphous mixture of nickel andboron with a hardness of about 700 HKN. When the deposit isheated above 300C the nickel crystallizes, forming nickelclusters of Ni (111) and boron precipitates as nickel boride,Ni3B (211) and (311), increasing the hardness to greater than1000 HK10
10、0for Type 2 coatings.1.7 The nickel boron coatings are microporous and offerlimited corrosion protection. Their columnar structure, how-ever, is beneficial in reducing wear because it provides a meansof trapping lubricants within the surface of the coated part.1.8 This document describes only autoca
11、talytic nickel boroncoatings that have been produced without use of externalelectric sources.1.9 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.10 The following hazards caveat pertains only to the TestMethods section of this
12、specification: This standard does notpurport to address the safety problems associated with its use.It is the responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.NOTE 1The following AMS
13、standards are not requirements. They arereferenced for information only: AMS 2399 and AMS 2433.2. Referenced Documents2.1 ASTM Standards:2B374 Terminology Relating to ElectroplatingB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination of CrossSectionB567 T
14、est 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 MetallicCoatingsB578 Test Method for Microhardness of ElectroplatedCoatingsB602 Test Method for Att
15、ribute Sampling of Metallic and1This specification is under the jurisdiction of ASTM Committee B08 on and isthe direct responsibility of Subcommittee B08.08.01 on Engineering Coatings.Current edition approved Sept. 1, 2009. Published November 2009. Originallyapproved in 1991. Last previous edition a
16、pproved in 2008 as B607 91 (2008).DOI: 10.1520/B0607-91R09.2For 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.1C
17、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Inorganic Coatings3B656 Guide for Autocatalytic (Electroless) Nickel-Phosphorus Deposition on Metals for Engineering Use(Discontinued 2000)3B667 Practice for Construction and Use of a Pro
18、be forMeasuring Electrical Contact ResistanceB678 Test Method for Solderability of Metallic-CoatedProductsB697 Guide for Selection of Sampling Plans for Inspectionof Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsD2670 Test Met
19、hod for Measuring Wear Properties of FluidLubricants (Falex Pin and Vee Block Method)D2714 Test Method for Calibration and Operation of theFalex Block-on-Ring Friction and Wear Testing MachineE39 Methods for Chemical Analysis of NickelF519 Test Method for Mechanical Hydrogen EmbrittlementEvaluation
20、of Plating/Coating Processes and Service Envi-ronments2.2 Aerospace Materials Specifications:AMS 2399 Electroless Nickel-Boron Plating4AMS 2433 Electroless Nickel-Thallium-Boron Plating42.3 U.S. Government Standards:MIL-STD-105 Sampling Procedures and Tables for Inspec-tion by Attributes5MIL-STD-131
21、65 Shot Peening of Metal Parts53. Terminology3.1 Definitions: Many terms used in this specificationaredefined in Terminology B374.3.2 Definitions of Terms Specific to This Standard:3.2.1 cold shuta void on the surface which has beenclosed by machining and then partially opened through clean-ing.3.2.
22、2 hot halide stress-corrosion crackinga type of me-chanical failure produced by halogenated solvents that havebeen absorbed onto titanium and then in the presence of heatcause microcracking, and the loss of mechanical strength.3.2.3 lap cracksa surface imperfection caused by coldworking of steels pr
23、oducing a void which can be duplicated inthe deposit.3.2.4 significant surfacethose substrate surfaces whichthe coating must protect and that are essential to the appear-ance.4. Classification4.1 The classification by type of these coatings establishesthe amount of boron in the alloy.4.1.1 Type 1Coa
24、tings shall contain 0.1 to less than 3.5mass percent boron with the balance nickel.4.1.2 Type 2Coatings shall contain 3.5 to 6 mass percentboron and a minimum of 90 mass percent nickel.4.2 The classification by class of these coatings establishesthe post treatment to be performed on the part(s). The
25、 posttreatment steps are designed to reduce the potential forhydrogen embrittlement, increase the adhesion of the coatingto the substrate, improve the fatigue properties of the part(s),and increase the wear resistance and hardness of the coating:4.2.1 Class 1Parts are supplied as plated with no post
26、 heattreatment.4.2.2 Class 2Parts are heat treated after plating to increasehardness. The coating is heat treated at 365 to 385C for 90min (see 7.2.4).4.2.3 Class 3Parts are heat treated after plating at 180 to200C for 2 to 23 h to improve coating adhesion on steel andfor hydrogen embrittlement reli
27、ef of steels (see 7.2.4).4.2.4 Class 4Parts are heat treated after plating at 120 to130C for a minimum of1htoimprove adhesion onheat-treatable (age-hardened) aluminum alloys and carburizedsteels (see 7.2.4).4.2.5 Class 5Parts are heat treated after plating at 365 to375C for a minimum of4htoimprove a
28、dhesion on titaniumand titanium alloys (see 7.2.4).4.3 The classification by grade establishes the minimumthickness of the coating:4.3.1 Grade AParts are plated to a minimum coatingthickness of 0.5 m.4.3.2 Grade BParts are plated to a minimum coatingthickness of 12 m.4.3.3 Grade CParts are plated to
29、 a minimum coatingthickness of 25 m.4.3.4 Grade DParts are plated to a minimum coatingthickness of 75 m.5. Ordering Information5.1 The purchaser should be aware of several processingconsiderations or options available to the processor and whenordering should supply the information described in 5.1.1
30、through 5.1.15 in the purchase order and drawings.5.1.1 Title, ASTM designation, and year of issue of thisspecification.5.1.2 Composition and metallurgical condition of the basismetal, assemblies of dissimilar materials must be identified.5.1.3 Classification of the coating: type, class, and grade f
31、orthis specification (see Section 4).5.1.4 Minimum thickness required on the significant sur-face, and any maximum dimensions or tolerance requirements,if any (see 7.2.2).5.1.5 Method of adhesion testing from Test Method B571 tobe used in acceptance requirements (see 8.3).5.1.6 Requirements for cert
32、ification and test reports (seeSection 11).5.1.7 Requirements for heat treatment of the part(s) forstress relief prior to plating (see 7.2.4).5.1.8 Optional sampling plan for lot inspection of the part(s)(see 9.1 and 13.1).5.1.9 Increased sampling frequency, if any, for qualificationtests (see 7.3).
33、3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.4Available from Society of Automotive Engineers (SAE), 400 CommonwealthDr., Warrendale, PA 15096-0001, http:/www.sae.org.5Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins
34、Ave., Philadelphia, PA 19111-5094, Attn: NPODS.B607 91 (2009)25.1.10 Supplemental requirements for shot peening of thepart(s) (see 12.1).5.1.11 Supplemental requirements for wear testing (see 12.2and 12.3).5.1.12 Supplemental requirements for heat treatment invacuum or inert or reducing atmosphere (
35、see 7.2.1 see 9.2) is examined for compliance with the requirements placed on theparts, a relatively small number of partsthe sampleis selected atrandom and inspected. The inspection lot is then classified as complyingor not complying with the requirements based on the results of theinspection sampl
36、e. The size of the sample and the criteria of complianceare determined by the application of statistics. The procedure is known assampling inspection. Test Method B602, Guide B697, and Method B762contain sampling plans that are designed for the sampling inspection ofcoatings.Test Method B602 contain
37、s four sampling plans, three for use with teststhat are nondestructive and one for use with tests that are destructive. Thepurchaser and producer may agree on the plan(s) to be used. If they do not,Test Method B602 identifies the plan to be used.Guide B697 provides a large number of plans and also g
38、ives guidanceon the selection of a plan. When Guide B697 is specified, the purchaserand producer need to agree on the plan to be used.Method B762 can be used only for coating requirements that have anumerical limit, such as coating thickness. The test must yield a numericalvalue and certain statisti
39、cal requirements must be met. Method B762contains several plans and also gives instructions for calculating plans tomeet special needs. The purchaser and producer may agree on the plan(s)to be used. If they do not, Method B762 identifies the plan to be used.9.2 An inspection lot shall be defined as
40、a collection ofcoated parts that are of the same kind, that have been producedto the same specification, that have been coated by a singleproducer at one time or approximately the same time underessentially identical conditions, and that are submitted foracceptance or rejection as a group.9.3 If sep
41、arate test specimens are used to represent thepart(s) in the test, the number shall be that required in 8.1.TABLE 2 Heat Hardening of Nickel Boron DepositsTemperature, C Time, min375 6 10 90TABLE 3 Post Heat Treatment for Class 4 and 5 CoatingsClass Temperature, C Time, minimum, hClass 4 125 6 51Cla
42、ss 5 370 6 54B607 91 (2009)410. Rejection and Rehearing10.1 Part(s) that fail to conform to the requirements of thisspecificationmay be rejected. Rejection shall be reported to theproducer promptly in writing. In the case of dissatisfactionwith the results of a test, the producer may make a claim fo
43、r arehearing. Coatings that show imperfections may be rejected.11. Certification11.1 When specified in the purchase order or contract, thepurchaser shall be furnished certification that the samplesrepresenting each lot have been processed, tested, and in-spected as directed in this specification and
44、 the requirementshave been met. When specified in the purchase order orcontract, a report of the test results shall be furnished.12. Supplementary Requirements12.1 Shot PeeningWhen specified by the purchaser in theordering information, the part(s) shall be shot peened prior toplating in accordance w
45、ith MIL-STD-13165.12.2 Abrasive WearWhen specified by the purchaser inthe ordering information, the coating shall be tested forabrasion wear resistance using the procedure described inAppendix X2 of this specification. The coating shall meet amaximum wear rate which is specified by the purchaser and
46、agreed to by the producer.12.3 Adhesive WearWhen specified by the purchaser inthe ordering information, the coating shall be tested foradhesive wear resistance using Test Method D2714 or D2670.The wear rate shall be specified by the purchaser and agreed toby the producer.12.4 Inert AtmosphereWhen sp
47、ecified by the purchaser inthe ordering information, the coating shall be heat treated in avacuum or an inert or reducing atmosphere to prevent surfaceoxidation of the coating.12.5 Contact ResistanceWhen specified by the purchaserin the ordering information, the coating shall be tested forcontact re
48、sistance using Practice B667.12.6 SolderabilityWhen specified by the purchaser in theordering information, the unaged coating shall pass TestMethod B678.13. Special Government Regulations13.1 SamplingThe producer when plating part(s) for theU.S. government and military use shall use a sampling planf
49、rom MIL-STD-105.13.2 Shot PeeningHigh strength steel part(s) processedfor U.S. government and military use shall be shot peened inaccordance with MIL-STD-13165.APPENDIXES(Nonmandatory Information)X1. DENSITY OF NICKEL BORON COATINGSX1.1 Many thickness test methods measure the mass perunit area and display the thickness in linear units. These testmethods require a density factor to calculate the thickness. Fig.X1.1 can be used to determine the density of nickel coatingswith varying boron contents.FIG. X1.1 Density of Nickel Coatings with Varyin
