1、Designation:B60715Standard 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 year of last revision.A
2、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 U.S.Department of Defense.1.Scope1.1 Nickel boron coatings are produced by autocatalytic(el
3、ectroless)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 specification describes the requirements for coat-ings of autocatalytic nickel boron d
4、eposited 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 of 3.5 to 6 masspercent and a
5、 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%boron.Thincoatings of this type provi
6、de 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 are frequently used to plate steel and
7、titanium 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 physical and mechanical properties of these de
8、pos-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 depositconsists of a predominantly amorphous mixture of ni
9、ckel 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 HK100for Type 2 coatings.1.7 The nickel boron coatings ar
10、e microporous and offerlimited corrosion protection.Their columnar structure,however,is beneficial in reducing wear because it provides ameans of trapping lubricants within the surface of the coatedpart.1.8 This document describes only autocatalytic nickel boroncoatings that have been produced witho
11、ut 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 specification:This standard does notpurport to address the
12、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.NOTE1The following AMS standards are not requirements.They arereferenced for informa
13、tion 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 ofCross SectionB567 Test Method for Measurement of Coating Thicknessby the Beta Backs
14、catter MethodB568 Test Method for Measurement of Coating Thicknessby X-Ray SpectrometryB571 Practice for Qualitative Adhesion Testing of MetallicCoatings1This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of Subcommit
15、teeB08.03 on Engineering Coatings.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1991.Last previous edition approved in 2014 as B607 91(2014).DOI:10.1520/B0607-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at
16、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 Box C700,West Conshohocken,PA 19428-2959.United States1 B578 Test Method for Microhardness of Electroplated Coat-ingsB602 Test Method for Attribute Sampling of Metallic andInorganic CoatingsB656 GuideforAutocatalytic(Electroless)Nickel-Phosphorus Deposition on Metals for Engineering Use(Discontinued 2000)(Withdra
