1、Designation:D718720Standard Test Method forMeasuring Mechanistic Aspects of Scratch/Mar Behavior ofPaint Coatings by Nanoscratching1This standard is issued under the fixed designation D7187;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,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.Scope1.1 This test method covers a nanoscratch method fordetermining the resistance of paint coatings on smooth fla
3、tsurfaces to scratch/mar.1.2 Other methods used in scratch/mar evaluation physi-cally scratch or mar a samples surface with single or multiplecontact cutting,and then use visual inspection to assign aranking.It has been recognized that loss of appearance ismainly due to surface damage created.This m
4、ethod quantita-tively and objectively measures scratch/mar behavior by mak-ing the evaluation process two steps with emphasis on surfacedamage.Step one is to find the relationship between damageshape and size and external input(such as forces,contactgeometry,and deformation).Step two is to relate da
5、mage shapeand size to visual loss of luster.The first step is covered by thismethod;in addition,a survey in the appendix provides anexample of an experiment to relate the damage to the change inluster.1.3 There are three elementary deformation mechanisms:elastic deformation,plastic deformation and f
6、racture;only thelatter two contribute significantly to mar.This method evalu-ates scratch/mar based on the latter two damage mechanisms.1.4 Although this standard was developed for paintcoatings,it can also be applied to other types of similarpolymer-based coatings,for example,lacquers,varnishes,gla
7、zes and other decorative and protective layers deposited onhard substrates.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its us
8、e.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.1.7 This international standard was developed in accor-dance with internationally recognized principles o
9、n 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:2D609 Practice for Preparation of Cold-Rolle
10、d Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating ProductsD823 Practices for Producing Films of Uniform Thicknessof Paint,Coatings and Related Products on Test PanelsD1005 Test Method for Measurement of Dry-Film Thick-ness of Organic Coatings Using MicrometersD1044 Test
11、Method for Resistance of Transparent Plastics toSurface Abrasion by the Taber AbraserD3363 Test Method for Film Hardness by Pencil Test(Withdrawn 2020)3D3924 Specification for Standard Environment for Condi-tioning and Testing Paint,Varnish,Lacquer,and RelatedMaterialsD5178 Test Method for Mar Resis
12、tance of Organic CoatingsD6037 Test Methods for Dry Abrasion Mar Resistance ofHigh Gloss CoatingsD6279 Test Method for Rub Abrasion Mar Resistance ofHigh Gloss CoatingsD7027 Test Method for Evaluation of Scratch Resistance ofPolymeric Coatings and Plastics Using an InstrumentedScratch MachineD7091 P
13、ractice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous MetalsG171 Test Method for Scratch Hardness of Materials Usinga Diamond Stylus1This test method is under the jurisdiction of AST
14、M Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.23 on Physical Properties of Applied Paint Films.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 2005.Last previous edition approved in 2015 as D
15、7187 15.DOI:10.1520/D7187-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For ASTM Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this hist
16、orical standard is referenced onwww.astm.org.Copyright 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.3.Summary of Test Method3.1 This
