ASTM_B_841_-_99_2010.pdf

Designation:B84199(Reapproved 2010)Standard Specification forElectrodeposited Coatings of Zinc Nickel Alloy Deposits1This standard is issued under the fixed designation B841;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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 the requirements for electrode-posited zinc nickel alloy coatings on metals.1.2 The values stated in SI units are to be regarded as thestandard.1.3 The following precautionary statement pertains to thetest method portion only,Section 8,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusB183 Practice for Preparation of Low-Carbon Steel forElectroplatingB242 Guide for Preparation of High-Carbon Steel for Elec-troplatingB320 Practice for Preparation of Iron Castings for Electro-platingB322 Guide for Cleaning Metals Prior to ElectroplatingB374 Terminology Relating to ElectroplatingB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB499 Test Method for Measurement of Coating Thicknessesby the Magnetic Method:Nonmagnetic Coatings onMagnetic Basis MetalsB504 Test Method for Measurement of Thickness of Metal-lic Coatings by the Coulometric MethodB507 Practice for Design of Articles to Be Electroplated onRacksB568 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 Electrodeposited Metallic and Inorganic CoatingsB762 Test Method of Variables Sampling of Metallic andInorganic CoatingsB849 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 EmbrittlementD3951 Practice for Commercial Packaging3.Terminology3.1 DefinitionsMany items used in this specification aredefined in Terminology B374.3.2 Definitions of Terms Specific to This Standard:3.2.1 significant surface,nthat portion of a coated arti-cles surface where the coating is required to meet all therequirements of the coating specification for that article.Significant surfaces are usually those that are essential to theserviceability or function of the article,or that can be a sourceof corrosion products or tarnish films that interfere with thefunction or desirable appearance of the article.3.2.2 DiscussionSignificant surfaces are those surfacesthat are identified by the purchaser by,for example,indicatingthem on an engineering drawing of the product or marking asample item of the product.4.Classification4.1 There is one class of zinc nickel coating defined asfollows:4.1.1 Class 1Deposits having a minimum of 5 and maxi-mum 12 mass%nickel,the balance being zinc.4.2 There are five chromate conversion coating types thatare defined as follows:4.2.1 Type AWith colorless(blue bright)conversioncoatings,4.2.2 Type BWith yellow iridescent conversion coatings,4.2.3 Type CWith bronze conversion coatings,1This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatingsand is the direct responsibility of SubcommitteeB08.06 on Soft Metals.Current edition approved Jan.1,2010.Published February 2010.Originallyapproved in 1993.Last previous edition approved in 12004 as B841 99(2004).DOI:10.1520/B0841-99R09.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2.4 Type DWith black chromate conversion coatings,and4.2.5 Type EAny of the above plus organic topcoat.NOTE1Whereas colored chromate conversion coatings are usuallymeant to include various shades of yellow to bronze when used withnonalloyed zinc,yellow and bronze chromate conversion coatings areconsidered distinctly different in appearance and performance whenapplied to alloyed zinc coatings and are formulated specifically to producethe desired coating and are formulated specifically to produce the desiredcoating.4.3 There are three grades according to thickness and aredefined as follows:Minimum Thickness,mNew ASTM GradeOld ASTM Grade551882101035.Ordering Information5.1 In order to mak