ASTM_D_6386_-_22.pdf

Designation:D638622Standard Practice forPreparation of Zinc(Hot-Dip Galvanized)Coated Iron andSteel Product and Hardware Surfaces for Painting1This standard is issued under the fixed designation D6386;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice describes methods of preparing surfaces ofnew and weathered hot-dip galvanized steel for painting withliquid paint and coating products.Preparing surfaces of newand partially weathered galvanized steel for powder coating isaddressed in Practice D7803.Hot-dip galvanized steel isproduced by the immersion of fabricated or unfabricatedproducts in a bath of molten zinc,as specified in SpecificationsA123/A123M or A153/A153M.This practice covers surfacepreparation on iron and steel products and hardware that havenot been painted previously.Galvanized surfaces may havebeen treated with protective coatings to prevent the occurrenceof wet storage stain.This practice does not apply to sheetgalvanized steel products nor to the coil coating or continuousroller coating processes.Sheet and coil surface preparation canbe done in accordance with Practice D7396.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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:2A123/A123M Specification for Zinc(Hot-Dip Galvanized)Coatings on Iron and Steel ProductsA153/A153M Specification for Zinc Coating(Hot-Dip)onIron and Steel HardwareA780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized CoatingsB201 Practice for Testing Chromate Coatings on Zinc andCadmium SurfacesD4285 Test Method for Indicating Oil or Water in Com-pressed AirD6492 Practice for Detection of Hexavalent Chromium OnZinc and Zinc/Aluminum Alloy Coated SteelD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous MetalsD7396 Guide for Preparation of New,Continuous Zinc-Coated(Galvanized)Steel Surfaces for PaintingD7803 Practice for Preparation of Zinc(Hot-Dip Galva-nized)Coated Iron and Steel Product and HardwareSurfaces for Powder CoatingE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy Current(Electromagnetic)Test-ing Methods2.2 SSPC Specifications:3Surface Preparation Specification No.1 Solvent CleaningSurface Preparation Specification No.2 Hand Tool CleaningSurface Preparation Specification No.3 Power Tool Clean-ing1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protective Coatings.Current edition approved Jan.1,2022.Published February 2022.Originallyapproved in 1999.Last previous edition approved in 2016 as D6386 16a.DOI:10.1520/D6386-22.2For 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.3Available from Society for Protective Coatings(SSPC),40 24th St.,6th Floor,Pittsburgh,PA 15222-4656,http:/www.sspc.org.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.1Surface Preparation Specification No.7 Brush-Off BlastCleaningSurface Preparation Specification No.11 Power Tool Clean-ing to Bare MetalSurface Preparation Specification No.16 Brush-Off BlastCleaning of Non-Ferrous MetalsPaint Specification No.27 Basic Zinc Chromate-Vinyl Bu-tyral Wash PrimerSSPC Guide 15 Field Methods for Extraction and Analysisof Soluble Salts on Steel and Other Nonporous Substrates3.Summary of Pra