ASTM_B_530_-_09_2014.pdf

Designation:B53009(Reapproved 2014)Standard Test Method forMeasurement of Coating Thicknesses by the MagneticMethod:Electrodeposited Nickel Coatings on Magnetic andNonmagnetic Substrates1This standard is issued under the fixed designation B530;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the use of magnetic instrumentsfor the nondestructive measurement of the thickness of anelectrodeposited nickel coating on either a magnetic or non-magnetic substrate.It is intended to supplement manufacturersinstructions for the operation of the instruments and is notintended to replace them.1.2 These instruments measure either the magnetic attrac-tion between a magnet and the coating-substrate combination(categorized as“magnetic pull-off”),or the change in magneticflux density within the probe(categorized as“electronic”).1.3 For this test method,there are two types of coating-substrate combinations that can be encountered:TypeA,nickelcoatings on a magnetic substrate,and Type B,nickel coatingson a nonmagnetic substrate.1.4 The effective measuring ranges of instruments using theprinciple of magnetic attraction are up to 50 m(2 mils)forType A coatings,and up to 25 m(1 mil)for Type B coatings.For gages based on change in magnetic flux density principles,the effective ranges are much greater,and measurements up to1 mm(40 mils)or more,can be made on both types ofcoatings.1.5 Measurements made in accordance with this test methodwill be in compliance with the requirements of ISO Stan-dard 2361 as printed in 1982.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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:2B487 Test Method for Measurement of Metal and OxideCoating Thickness by Microscopical Examination ofCross SectionB499 Test Method for Measurement of Coating Thicknessesby the Magnetic Method:Nonmagnetic Coatings onMagnetic Basis MetalsB504 Test Method for Measurement of Thickness of Metal-lic Coatings by the Coulometric MethodB748 Test Method for Measurement of Thickness of Metal-lic Coatings by Measurement of Cross Section with aScanning Electron Microscope2.2 ISO International Standard:ISO 2361 Electrodeposited Nickel Coatings on Magneticand Nonmagnetic SubstratesMeasurement of CoatingThicknessMagnetic Method33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accuracy,nthe measure of the magnitude of errorbetween the result of a measurement and the true thickness ofthe item being measured.3.1.2 adjustment,nthe physical act of aligning an instru-ments thickness readings to match those of a known thicknesssample(removal of bias),in order to improve the accuracy ofthe instrument on a specific surface or within a specific portionof its measurement range.An adjustment will affect theoutcome of subsequent readings.1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 1970.Last previous edition approved in 2009 as B530 09.DOI:10.1520/B0530-09R14.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.3 calibration,nthe high-level,controlled and docu-mented process of obtaining measurements on traceable cali-bration standards over the full operating range of theinstrument,then making the necessary instrument adjustments(as required)to correct any out-of-tolerance conditions.3.1.3.1 DiscussionCalibration of coating thickness instru-ments is performed by the equipment manufacturer,an autho-rized agent,or by an authorized,trained calibration laboratoryin a controlled environment using a documented process.Theoutcome of the calibration process is to restore/realign theinstrument to meet/exceed the manufacturers stated accuracy.3.1.4 reference standard,na specimen of known thicknessused to verify the accuracy of a coati