ASTM_B_975-18.pdf

This 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.Designation:B975-18ATIONALStandard Test Method forMeasurement of Internal Stress of Metallic Coatings by SplitStrip Evaluation(Deposit Stress Analyzer Method)This standard is issued under the fixed designation B975: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(e)indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe deposit stress analyzer method provides a rapid,accurate,and economical means for thedetermination of the internal tensile and compressive stress in metallic and nonmetallic coatings.Internal stress is expressed in pounds per square inch or megapascals.This procedure for measuringinternal stress offers the advantages of test specimens that are pre-calibrated by the manufacturer,asmall test specimen coating surface area,and rapid determination of the internal stress in the appliedcoating.1.Scope2.Referenced Documents1.1 This test method for determining the internal tensile or2.1 ASTM Standards:2compressive stress in applied coatings is quantitative.It isB636 Test Method for Measurement of Internal Stress ofapplicable to metallic layers that are applied by the processesPlated Metallic Coatings with the Spiral Contractometerof electroplating or chemical deposition that exhibit internalE177 Practice for Use of the Terms Precision and Bias intensile or compressive stress values from 200 to 145 000 psiASTM Test Methods(1.38to1000MPa).E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method1.2 The values stated in either SI units or inch-pound units2.2 IEC Standard:are to be regarded separately as standard.The values stated inIEC 61010 Safety Requirements for Electrical Equipmenteach system are not necessarily exact equivalents;therefore,tofor Measurement,Control,and Laboratory Useensure conformance with the standard,each system shall be3.Terminologyused independently of the other,and values from the twosystems shall not be combined.3.1 Definitions of Terms Specific to This Standard:3.1.1 average deposit thickness,n-average deposit thick-1.3 This standard does not purport to address all of theness equals the deposit weight in grams divided by the specificsafety concerns,if any,associated with its use.It is thegravity of the deposit in grams per cubic centimetre multipliedresponsibility of the user of this standard to establish appro-by the plated deposit surface area per test strip(see Eq 3).priate safety,health,and environmental practices and deter-3.1.2 constant K.n-this certifiable calibrated number ismine the applicability of regulatory limitations prior to use.determined experimentally for each material lot of test strips1.4 This international standard was developed in accor-manufactured to enable simple mathematical calculation of thedance with internationally recognized principles on standard-internal deposit stress while factoring the influence of theization established in the Decision on Principles for thepercent elongation difference between the deposit and theDevelopment of International Standards,Guides and Recom-substrate without the use of complicated bent strip formulas.mendations issued by the World Trade Organization TechnicalSee Note 4 in Section 8.Barriers to Trade(TBT)Committee.3.1.3 helix,n-metal strip approximately 0.01 to 0.013 in.(0.025 to 0.033 cm)thick formed as a helix approximatelyThis test method is under the jurisdiction of ASTM Committee B08 on Metallic2 For referenced ASTM standards,visit the ASTM website.www.astm.org.orand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 oncontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMTest Methods.Standards volume information,refer to the standards Document Summary page onCurrent edition approved Dec.1.2018.Published January 2019.Originallythe ASTM website.approved in 2015.Last previous edition approved in 2015 as B975-15.DOl:Available from Intemational Electrotechnical Commission(IEC).3.rue de10.1520VB0975.18Varembe,P.O.Box 131.1211 Geneva 20.Switzerland,http:/www.iec.ch.CopyrightASTM Intemational,100 Barr Harbor Drive,PO Box C700.West Conshohocken,PA 19428-2959.United States