1、Designation:D4541091Standard Test Method forPull-Off Strength of Coatings Using Portable AdhesionTesters1This standard is issued under the fixed designation D4541;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revis
2、ion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEPractice D3980 was deleted from Section 2 in August 2010.1.Scope*1.1 This test method covers a procedure for evaluating thepull-off strengt
3、h(commonly referred to as adhesion)of acoating system from metal substrates.Pull-off strength ofcoatings from concrete is described in Test Method D7234.Thetest determines either the greatest perpendicular force(intension)that a surface area can bear before a plug of materialis detached,or whether t
4、he surface remains intact at a pre-scribed force(pass/fail).Failure will occur along the weakestplane within the system comprised of the test fixture,adhesive,coating system,and substrate,and will be exposed by thefracture surface.This test method maximizes tensile stress ascompared to the shear str
5、ess applied by other methods,such asscratch or knife adhesion,and results may not be comparable.NOTE1The procedure in this standard was developed for metalsubstrates,but may be appropriate for other rigid substrates such as plasticand wood.Factors such as loading rate and flexibility of the substrat
6、e mustbe addressed by the user/specifier.1.2 Pull-off strength measurements depend upon both ma-terial and instrumental parameters.Results obtained by eachtest method may give different results.Results should only beassessed for each test method and not be compared with otherinstruments.There are fi
7、ve instrument types,identified as TestMethods B-F.It is imperative to identify the test method usedwhen reporting results.NOTE2Method A,which appeared in previous versions of thisstandard,has been eliminated as its main use is for testing on concretesubstrates(see Test Method D7234).1.3 This test me
8、thod uses a class of apparatus known asportable pull-off adhesion testers.2They are capable of apply-ing a concentric load and counter load to a single surface sothat coatings can be tested even though only one side isaccessible.Measurements are limited by the strength of adhe-sion bonds between the
9、 loading fixture and the specimensurface or the cohesive strengths of the adhesive,coatinglayers,and substrate.1.4 This test can be destructive and spot repairs may benecessary.1.5 The values stated in MPa(inch-pound)units are to beregarded as the standard.The values given in parentheses arefor info
10、rmation only.1.6 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.Ref
11、erenced Documents2.1 ASTM Standards:3D2651 Guide for Preparation of Metal Surfaces forAdhesiveBondingD3933 Guide for Preparation of Aluminum Surfaces forStructural Adhesives Bonding(Phosphoric Acid Anodiz-ing)D7234 Test Method for Pull-Off Adhesion Strength of Coat-ings on Concrete Using Portable Pu
12、ll-Off Adhesion Tes-tersE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ANSI Standard:N512 Protective Coatings(Paints)for the Nuclear Industry42.3 ISO Standard:ISO 4624 Paints and VarnishPull-Off Test for Adhesion43.Summary of Test Method3.1 The ge
13、neral pull-off test is performed by securing aloading fixture(dolly,stud)normal(perpendicular)to the1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.46 on Industrial Protectiv
14、e Coatings.Current edition approved Feb.1,2009.Published April 2009.Originallyapproved in 1993.Last previous edition approved in 2002 as D4541 02.DOI:10.1520/D4541-09E01.2The term adhesion tester may be somewhat of a misnomer,but its adoption bytwo manufacturers and at least two patents indicates co
15、ntinued usage.3For 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 standars Document Summary page onthe ASTM website.4Available from American National Standards Institute
16、(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*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 States1 surface of the coating with an adhesive.After the adhesive iscured,a testing apparatus is attached to the loading fixture andaligned to apply tension normal to the test surface.The forceapplied to the loading fixture is then gradually increased andmonitored