ASTM_F_1136_-_F_1136M_-_11_2019.pdf

Designation:F1136/F1136M11(Reapproved 2019)Standard Specification forZinc/Aluminum Corrosion Protective Coatings forFasteners1This standard is issued under the fixed designation F1136/F1136M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers the basic requirements forwater-based zinc/aluminum dispersion inorganic basecoats andoptional sealers and topcoats for fasteners.The basecoat cancontain chrome(C)or be non-chrome(NC).1.2 These coatings are applied by conventional dip-spin,dip-drain,or spray methods to ferrous parts which can behandled through a cleaning,coating,and baking operation,andwhich are not adversely affected by baking temperatures up to330 C 626 F.1.3 The coating process does not induce the possibility ofinternal hydrogen embrittlement providing that the fastenershave not been cleaned or pre-treated with an acid or phosphate.Alkaline cleaning or vapor degreasing is required along withshot blasting to remove rust or scale.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 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.1.6 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:2B117 Practice for Operating Salt Spray(Fog)ApparatusD610 Practice for Evaluating Degree of Rusting on PaintedSteel SurfacesD3359 Test Methods for Rating Adhesion by Tape TestF606/F606M Test Methods for Determining the MechanicalPropertiesofExternallyandInternally ThreadedFasteners,Washers,Direct Tension Indicators,and RivetsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1624 Test Method for Measurement of Hydrogen Em-brittlement Threshold in Steel by the Incremental StepLoading TechniqueF1789 Terminology for F16 Mechanical FastenersF1940 Test Method for Process Control Verification toPrevent Hydrogen Embrittlement in Plated or CoatedFasteners3.Classification3.1 These coatings are classified into six grades according tothe requirements in Table 1.3.1.1 Grade 1 requires a minimum basecoat thickness of4m 16g/m2 or 0.16 mil(0.052 oz/ft2).This is usuallyapplied in two coats to bulk parts,or one coat to racked parts.No topcoat is applied in Grade 1.3.1.2 Grade 2 requires a minimum basecoat thickness of5m 20 g/m2 or 0.20 mil(0.066 oz/ft2).This is usuallyapplied in two coats to bulk parts,or one coat to racked parts.No topcoat is applied in Grade 2.3.1.3 Grade 3 requires a minimum basecoat thickness of5m 20 g/m2 or 0.20 mil(0.066 oz/ft2)and a single coat ofthe clear sealer.The sealer provides additional corrosionprotection and greater lubricity than Grade 2.3.1.4 Grade 4 requires a minimum basecoat thickness of8m 28 g/m2 or 0.31 mil(0.092 oz/ft2).This is usuallyapplied in three coats to bulk parts,or one to two coats toracked parts.No topcoat is applied in Grade 4.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.03 on Coatings onFasteners.Current edition approved April 1,2019.Published April 2019.Originallyapproved in 1988.Last previous edition approved in 2011 as F1136/F1136M11.DOI:10.1520/F1136_F1136M-11R19.2For 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.*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 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 3.1.5 Grade 5 requires a minimum basecoat thickness of5m 20 g/m2 or 0.20 mil(0.066 oz/ft2)and a single coat o