ASTM_D_7396_-_14.pdf

Designation:D739614Standard Guide forPreparation of New,Continuous Zinc-Coated(Galvanized)Steel Surfaces for Painting1This standard is issued under the fixed designation D7396;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.Scope*1.1 This guide covers surface cleaning and various methodsfor treating new,continuous zinc-coated(galvanized)steelsurfaces produced by either the hot-dip method or by electro-plating.This guide is applicable to only surface preparation forapplication of liquid paint and coating products,and not forpowder coating applications.This guide covers surfaces thathave not been treated previously at the mill to providetemporary protection against staining by moisture other than byeasily removed protective oils(see Appendix X1).For prepar-ing surfaces of new or weathered items of zinc-coated steelproduced by batch processing,refer to Practice D6386.1.2 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A780 Practice for Repair of Damaged and Uncoated Areasof Hot-Dip Galvanized CoatingsD4285 Test Method for Indicating Oil or Water in Com-pressed AirD6386 Practice for Preparation of Zinc(Hot-Dip Galva-nized)Coated Iron and Steel Product and HardwareSurfaces for PaintingD6492 Practice for Detection of Hexavalent Chromium OnZinc and Zinc/Aluminum Alloy Coated Steel2.2 SSPCThe Society for Protective Coatings Standards:3Surface Preparation Specification No.1 Solvent CleaningSurface Preparation Specification No.2 Hand Tool CleaningSurface Preparation Specification No.3 Power Tool Clean-ingSurface Preparation Specification No.16 Brush-Off BlastCleaning of Coated and Uncoated Galvanized Steel,Stainless Steel,and Non-Ferrous MetalsPaint Specification No.27 Basic Zinc Chromate-Vinyl Bu-tyral Wash Primer3.Summary of Guide3.1 This guide describes surface cleaning and treatmentmethods that provide galvanized surfaces suitable for painting,specifically so that an applied coating system can develop theadhesion necessary for satisfactory service life.3.2 Eight methods of treatment(Note 1 and Note 2)arecovered as follows:3.2.1 Method AZinc Phosphate Treatment.3.2.2 Method BChromate Treatment.3.2.3 Method CAqueous Chromic-Organic Treatment.3.2.4 Method DAcid-Curing Resinous Treatment.3.2.5 Method EAnnealing Heat Treatments.3.2.6 Method FAmorphous Complex-Oxide Treatment.3.2.7 Method GAbrasive Blast Cleaning.3.2.8 Method HFluro-Titanic/Zirconic Polymer Treat-ment.NOTE1Materials employed in these methods of treatment areavailable from a number of sources as proprietary compounds or methods.Selection may be made from available sources.NOTE2The use of solvents containing volatile organic compounds toprepare or treat the surface of metal components contributes to airpollution in the same manner as the use of solvent containing paints andcoatings.The user of this guide must determine the applicability ofappropriate regulations governing the volatile organic compound contentof the materials used in a shop application(Miscellaneous Metal Parts),field painting(Architectural),or specific process industry.3.3 Variations in surface preparation produce end conditionsthat differ and hence do not necessarily yield identical resultswhen paints are subsequently applied.Service conditions will1This guide 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 Dec.1,2014.Published January 2015.Originallyapproved in 2007.Last previous edition approved in 2008 as D7396 08.DOI:10.1520/D7396-14.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 dictate the type of surface preparation to be selected,althoughthe quality produced by any individual method may vary withdifferent zinc coatings.3.4 Galvanized surfaces are treated by using various meth-ods and apparatus;satisfactory ap