ASTM_D_2092_-_95_2001e1.pdf

Designation:D 2092 95(Reapproved 2001)e1Standard Guide forPreparation of Zinc-Coated(Galvanized)Steel Surfaces forPainting1This standard is issued under the fixed designation D 2092;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(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.e1NOTEFootnote 3 was corrected editorially in June 2001.1.Scope1.1 This guide describes eight methods of treating newzinc-coated(galvanized)surfaces produced by either the hot-dip method or by electroplating.This practice covers surfacesthat have not been treated previously at the mill to providetemporary protection against staining by moisture other than byeasily removed protective oils(see Appendix X1).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:D 1193 Specification for Reagent Water22.2Steel Structures Painting Council Specification:Paint No.27 Basic Zinc Chromate-Vinyl Butyrol WashPrimer33.Summary of Guide3.1 This guide describes treatment methods that providegalvanized surfaces suitable for painting,specifically so that anapplied coating system can develop the adhesion necessary forsatisfactory service life.3.2 Eight methods of surface preparation(Note 1 and Note2)are covered 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 are avail-able 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 standard 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,hence do not necessarily yield identical results whenpaints are subsequently applied.Service conditions will dictatethe type of surface preparation to be selected,although thequality produced by any individual method may vary withdifferent zinc coatings.3.4 Galvanized surfaces are treated by using various meth-ods and apparatus;satisfactory application may be made at thefollowing locations:MillPlantFieldMethod AYYYMethod BYY.Method CYY.Method DYYYMethod EY.Method FYY.Method GYYYMethod HYY.3.5 This guide does not describe the cleaning necessary toprovide a zinc-coated(galvanized)surface suitable for theapplication of the treatments.Many cleaning methods areapplicable and should be agreed upon between the purchaserand the supplier.NOTE3Most producers of zinc-coated(galvanized)steel sheets andcoils have adopted the practice of applying an inhibitor to the zinc surfaceto give temporary protection against staining by moisture during shippingor storage.Some of these inhibitors interfere with proper reaction of most1This 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 April 15,1995.Published June 1995.Originallypublished as D 2092 86.Last previous edition D 2092 86(1993).2ASTM Book of Standards,Vol 11.01.3Available from The Society For Protective Coatings(SSPC),2100 Wharton St.,Suite 310,Pittsburgh,PA 152031951.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.of the treatments described in these methods,and an unsatisfactory surfacefor painting results.It is strongly recommended that the purchaser consultthe supplier of the chemical treatment to be used as to the suitability of thezinc surfaces for treatment by any of these methods(see Appendix X2).4.Significance and Use4.1 This guide describes procedures that can be used toprepare new zinc-coated surfaces for painting and improve thebond of paint to the zinc surface.5.Processes5.