ASTM_B_842_-_99_2016.pdf

Designation:B84299(Reapproved 2016)Standard Specification forElectrodeposited Coatings of Zinc Iron Alloy Deposits1This standard is issued under the fixed designation B842;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 iron alloy coatings on metals.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The following precautionary caveat pertains to the testmethod 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 MethodB568 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 terms 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.3.2.1.1 DiscussionSignificant surfaces are usually thosethat are essential to the serviceability or function of the article,or that can be a source of corrosion products or tarnish filmsthat interfere with the function or desirable appearance of thearticle.Significant surfaces are those surfaces that are identi-fied by the purchaser by,for example,indicating them on anengineering drawing of the product or marking a sample itemof the product.4.Classification4.1 There is one class of zinc iron alloy that is defined asfollows:4.1.1 Class 1Deposits having approximately 99 mass%zinc,balance iron.4.2 There are two coating types that are defined as follows:4.2.1 Type AZinc iron with black chromate conversioncoating,and4.2.2 Type BZinc iron with iridescent yellow chromateconversion coating.1This specification is under the jurisdiction of ASTM Committee B08 onMetallic and Inorganic Coatings and is the direct responsibility of SubcommitteeB08.06 on Soft Metals.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1993.Last previous edition approved in 2011 as B842 99(2011).DOI:10.1520/B0842-99R16.2For 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 4.3 There are three coating grades according to thicknessthat are defined as follows:Minimum Thickness,mNew ASTM GradeOld ASTM Grade66112122181835.Ordering Information5.1 In order to make the application of this specificationcomplete,the purchaser needs to supply the following infor-mation to the seller in the purchase order and drawings:5.1.1 Title,ASTM designation number,and date of issue ofthis specification,5.1.2 Deposit by classification including class(see 4.1),type(see 4.2),and grade(see 4.3),5.1.3 Composition and metallurgical condition of the sub-strate to be coated,5.1.4 Location of significant surfaces(see 3.2),5.1.5 Heat treatment for stress relief,whether it has beenperformed by purchaser or is required(see 6.7),5.1.6 Heat treatment after electropla