ASTM_E_2338_-_11.pdf

Designation:E233811Standard Practice forCharacterization of Coatings Using Conformable Eddy-Current Sensors without Coating Reference Standards1This standard is issued under the fixed designation E2338;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,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.Scope*1.1 This practice covers the use of conformable eddy-current sensors for nondestructive characterization of coatingswithout standardization on coated reference parts.It includesthe following:(1)thickness measurement of a conductivecoating on a conductive substrate,(2)detection and character-ization of local regions of increased porosity of a conductivecoating,and(3)measurement of thickness for nonconductivecoatings on a conductive substrate or on a conductive coating.This practice includes only nonmagnetic coatings on eithermagnetic(0)or nonmagnetic(=0)substrates.Thispractice can also be used to measure the effective thickness ofa process-affected zone(for example,shot peened layer foraluminum alloys,alpha case for titanium alloys).For specifictypes of coated parts,the user may need a more specificprocedure tailored to a specific application.1.2 Specific uses of conventional eddy-current sensors arecovered by Practices D7091 and E376 and the following testmethods issued by ASTM:B244,E1004,and G12.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.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-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B244 Test Method for Measurement of Thickness of AnodicCoatings on Aluminum and of Other NonconductiveCoatings on Nonmagnetic Basis Metals with Eddy-Current InstrumentsD7091 Practice for Nondestructive Measurement of DryFilm Thickness of Nonmagnetic Coatings Applied toFerrous Metals and Nonmagnetic,Nonconductive Coat-ings Applied to Non-Ferrous MetalsE376 Practice for Measuring Coating Thickness byMagnetic-Field or Eddy-Current(Electromagnetic)Test-ing MethodsE543 Specification for Agencies Performing NondestructiveTestingE1004 Test Method for Determining Electrical ConductivityUsing the Electromagnetic(Eddy-Current)MethodE1316 Terminology for Nondestructive ExaminationsG12 Test Method for Nondestructive Measurement of FilmThickness of Pipeline Coatings on Steel(Withdrawn2013)32.2 ASNT Documents:4SNT-TC-1A Recommended Practice for Personnel Qualifi-cation and Certification In Nondestructive TestingANSI/ASNT-CP-189 Standard for Qualification and Certifi-cation of NDT Personnel2.3 AIA Standard:NAS 410 Certification and Qualification of NondestructiveTesting Personnel5NOTE1See Appendix X1.3.Terminology3.1 DefinitionsFor definitions of terms relating to thispractice,refer to Terminology E1316.The following defini-tions are specific to the conformable sensors:3.1.1 conformablerefers to an ability of sensors or sensorarrays to conform to nonplanar surfaces without any significanteffects on the measurement results.1This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.07 onElectromagnetic Method.Current edition approved Feb.15,2011.Published March 2011.Originallyapproved in 2004.Last previous edition approved in 2006 as E2338-06.DOI:10.1520/E2338-11.2For 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.4Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.5Available from Aerospace Industries Association of America,Inc.(AIA),1000Wilson Blvd.,Suite 1700,Arlington,VA22209-3928,http:/www.aia-aerospace.org.(Replacement standard for MIL-STD-410.)*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 3.1.2 lift-offnormal distance from the conformable sensorwinding plane to the top of the first conducting layer of the partunder examination.3.1.3 model for sensor responsea relation between theresponse of the sensor(for example,transimpedance magni-tude and phase or real and imaginary parts)to properties ofinterest,for example,electrical conductivity,magneticperm