ASTM_D_6294_-_D_6294M_-_13.pdf

Designation:D6294/D6294M13Standard Test Method forCorrosion Resistance of Ferrous Metal Fastener AssembliesUsed in Roofing and Waterproofing1This standard is issued under the fixed designation D6294/D6294M;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 test method covers components of ferrous metalfastener assemblies,excluding those of stainless steel,such asfasteners,stress plates,and batten bars used in low sloperoofing and waterproofing,to a sulfurous acid environment.This test method evaluates relative corrosion resistance of thecomponents by determination of percentage of rust or whiterust.1.2 The components may or may not have a surface treat-ment applied.1.3 Alimiting factor is the subjectiveness when determiningactual percentage of rust or white rust corrosion.1.4 Other performance characteristics of ferrous metal com-ponents such as abrasion resistance of barrier coatings are notevaluated in this method.1.5 This test method was developed based on Practice G87.1.6 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.1.7 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:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD1079 Terminology Relating to Roofing and WaterproofingG15 Terminology Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G87 Practice for Conducting Moist SO2Tests3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,seeTerminology D1079,G15,and D16.3.2 Definitions of Terms Specific to This Standard:3.2.1 barrierany material limiting passage through itselfof solids,liquids,semi-solids,gases,vapors,or forms ofenergy such as ultraviolet light.3.2.2 surface treatmenta process by which the surface ofthe ferrous metal component is treated with a barrier coating toinhibit corrosion.Examples of barrier coatings for ferrousmetal components include galvanization,zinc plating with orwithout yellow or clear chromate sealer,cadmium,mechanicalzinc plating and organic or inorganic polymers.4.Summary of Test Method4.1 This test method exposes ferrous metal specimens to 15or 30(24)h cycles consisting of the following:4.1.1 Eight(8)h exposure to the sulfur dioxide atmospherein a closed chamber.4.1.2 An intermediate step of rinsing with distilled water,and4.1.3 Sixteen(16)h of drying under vented conditions atcontrolled temperature and humidity.4.2 After drying,the test specimens are visually examinedto evaluate the percentage of rust or white rust that formed onthe surface.4.3 The total surface area of the components exposed in thechamber is 0.5 6 0.1 m2775 6 155 in.2.1This test method is under the jurisdiction ofASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.20 onRoofing Membrane Systems.Current edition approved May 1,2013.Published June 2013.Originallyapproved in 1998.Last previous edition approved in 2009 as D6294 98(2009)E01.DOI:10.1520/D6294_D6294M-13.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 It is important to evaluate the corrosion resistance offerrous metal components used in low-slope roofing andwaterproofing because they provide integrity and securementof other system components,such as insulation and mem-branes.Corrosion of ferrous metal components may result intheir early deterioration and may lead to roofing or waterproof-ing system failure.5.2 Results from testing ferrous metal components in anacidic atmosphere serve as an indication of the relativecorrosion resistance of such components,coated or uncoated,to the environment of the test chamber.The results are not tobe construed as a general guideline to the corrosion resistanceof such components in other environments or in usage that maybe conducive to corrosion.5.3 Moist air containing sulfur dioxide quickly produceseasily visible corrosion on many ferr