1、Designation:D648601(Reapproved 2011)Standard Practice forShort Term Vehicle Service Exposure of AutomotiveCoatings1This standard is issued under the fixed designation D6486;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、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.Scope1.1 This practice covers the protocol for vehicle serviceexposure testing of automotive coatings.Such exposure testingis valuab
3、le for the verification of the performance of automo-tive coatings and correlation with laboratory test data.Vehicleservice exposure is intended to provide short term(2 to 20weeks)exposure to the stress factors associated with vehicleoperation.Factors included are scratch,mar,impact,stonechipping,in
4、sect impact,bird dropping,tree sap and staining,environmental fallout,etc.NOTE1Vehicle service exposure is not intended to provide theconditions that are needed for characterizing the long term effects ofweathering or corrosion exposure.1.2 The exposure conditions are produced by the placementof mul
5、tiple test panels of automotive finishes on automotivetest fleets that traverse a defined road course.Exposure to theoperating environment can be 20 h/day,7 days/week allowingfor accumulation of over 100 000 miles in 10 weeks ofexposure.1.3 The values stated in SI units are to be regarded as thestan
6、dard.The values given in parentheses are for informationonly.1.4 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-bil
7、ity of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D523 Test Method for Specular GlossD609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating ProductsD714 Test Method for Evaluating Degree of Blisteri
8、ng ofPaintsD823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1186 Test Methods for Nondestructive Measurement ofDry Film Thickness of Nonmagnetic Co
9、atings Applied toa Ferrous Base(Withdrawn 2006)3D1400 Test Method for Nondestructive Measurement of DryFilm Thickness of Nonconductive Coatings Applied to aNonferrous Metal Base(Withdrawn 2006)3D3170 Test Method for Chipping Resistance of CoatingsD3359 Test Methods for Measuring Adhesion by Tape Tes
10、tD5767 Test Methods for Instrumental Measurement ofDistinctness-of-Image Gloss of Coating Surfaces2.2 U.S.Federal Standard:DOT NHTSA Reg.#49 CFR Part 57543.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 blistering,nformation in the film of dome-shaped,liquid-or gas-filled projec
11、tions resulting from local loss ofadhesion and lifting of the film from the previously appliedcoating or the substrate.3.1.2 chipping,nremoval of a coating,usually in smallpieces,resulting from impact by hard objects or from wearduring service.3.1.3 cracking,nformation of breaks in a film that exten
12、dthrough to the underlying surface.3.1.4 distinctness-of-image-gloss,naspect of gloss char-acterized by the sharpness of images of objects produced byreflection at a surface.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is
13、the direct responsibility ofSubcommittee D01.55 on Factory Applied Coatings on Preformed Products.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 1999.Last previous edition approved in 2005 as D6486 01(2005).DOI:10.1520/D6486-01R11.2For referenced ASTM standards,visit
14、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.4Available from U.S
15、.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 gloss,nangular selectivity of reflectance,involv
16、ingsurface-reflected light,responsible for the degree to whichreflected highlights or images of objects may be seen assuperimposed on a surface.3.1.6 staining,ndiscoloration,arising from foreignmaterials,that penetrates into the coating.4.Significance and Use4.1 Since the exposure of automotive coatings to the variousmechanical and chemical stresses encountered in actualoperations,is very opportunistic,obtaining statistically signifi-cant data from which valid conclusions can be drawn,requiresri
