ASTM_A_1059_-_A_1059M_-_18.pdf

Designation:A1059/A1059M18Standard Specification forZinc Alloy Thermo-Diffusion Coatings(TDC)on SteelFasteners,Hardware,and Other Products1This standard is issued under the fixed designation A1059/A1059M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the general requirements forprotective zinc coatings(hereinafter referred to as the coatings)to be applied by the thermo-diffusion coating(TDC)method,to various products made of carbon steel,including low andhigh tensile parts as well as of wrought iron,iron and steelcastings,sintered iron steel-powder,and various steel andstainless alloys.TDC is a dry coating process carried out byimmersing the parts in a zinc or zinc alloy powder at elevatedtemperature for a period of time,causing a metallurgicaldiffusion process of zinc and iron.Further processing may beadded,such as passivation,topcoat application,paintapplication,etc.1.2 This specification is applicable to orders in eitherinch-pound units(as A1059)or in SI units(as A1059M).Inch-pound units and SI units are not necessarily exactequivalents.Within the text of this specification and whereappropriate,SI units are shown in brackets.Each system shallbe used independently of the other without combining values inany way.In the case of orders in SI units,all testing andinspection shall be done using the metric equivalent of the testor inspection method as appropriate.In the case of orders ininch-pound units,such shall be stated to the applicator whenthe order is placed.1.3 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-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA385/A385M Practice for Providing High-Quality ZincCoatings(Hot-Dip)A700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentA902 Terminology Relating to Metallic Coated Steel Prod-uctsB487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionD521 Test Methods for Chemical Analysis of Zinc Dust(Metallic Zinc Powder)D6386 Practice for Preparation of Zinc(Hot-Dip Galva-nized)Coated Iron and Steel Product and HardwareSurfaces for PaintingE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy Current(Electromagnetic)Test-ing MethodsF1789 Terminology for F16 Mechanical FastenersF2329/F2329M Specification for Zinc Coating,Hot-Dip,Requirements for Application to Carbon and Alloy SteelBolts,Screws,Washers,Nuts,and Special ThreadedFastenersF2674 Specification for Zinc Coating,Hot-Dip,Require-ments for Application to Carbon and Alloy Steel Bolts,Screws,Washers,Nuts,and Special Threaded Fasteners1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.13 on Structural Shapes and Hardware Specifications.Current edition approved Nov.1,2018.Published November 2018.Originallyapproved in 2008.Last previous edition approved in 2013 as A1059/A1059M 08(2013).DOI:10.1520/A1059_A1059M-18.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 Metric(Withdrawn 2011)33.Terminology3.1 The following terms and definitions are specific to thisspecification.Terminology A902 contains other terms anddefinitions relating to metallic-coated steel products.Terminol-ogy F1789 contains other terms and definitions relating tomechanical fasteners.3.2 The inherent surface microroughness resulting from thethermal diffusion process makes the resulting surface wellsuited to r