1、Designation:G10689(Reapproved 2015)Standard Practice forVerification of Algorithm and Equipment for ElectrochemicalImpedance Measurements1This standard is issued under the fixed designation G106;the number immediately following the designation indicates the year oforiginal adoption or,in the case of
2、 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.Scope1.1 This practice covers an experimental procedure whichcan be used to check ones instrumentation and tec
3、hnique forcollecting and presenting electrochemical impedance data.Iffollowed,this practice provides a standard material,electrolyte,and procedure for collecting electrochemical im-pedance data at the open circuit or corrosion potential thatshould reproduce data determined by others at different tim
4、esand in different laboratories.This practice may not be appro-priate for collecting impedance information for all materials orin all environments.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not pur
5、port 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:2D1193
6、Specification for Reagent WaterG3 Practice for Conventions Applicable to ElectrochemicalMeasurements in Corrosion TestingG5 Reference Test Method for Making PotentiodynamicAnodic Polarization MeasurementsG15 Terminology Relating to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G59 Test Method for
7、 Conducting Potentiodynamic Polariza-tion Resistance Measurements3.Terminology3.1 DefinitionsFor definitions of corrosion related terms,see Terminology G15.3.2 Symbols:C=capacitance(farad-cm2)E=real component of voltage(volts)E=imaginary component of voltage(volts)E=complex voltage(volts)f=frequency
8、(s1)I=real component of current(amp-cm2)I=imaginary component of current(amp-cm2)I=complex current(amp-cm2)j=21L=inductance(henry cm2)Rs=solution resistance(ohm-cm2)Rp=polarization resistance(ohm-cm2)Rt=charge transfer resistance(ohm-cm2)Z=real component of impedance(ohm-cm2)Z=imaginary component of
9、 impedance(ohm-cm2)Z=complex impedance(ohm-cm2)=phenomenological coefficients caused by depressionof the Nyquist plot below the real axis,is theexponent and is the time constant(s).=phase angle(deg)=frequency(radians-s1)3.3 Subscripts:x=in-phase componenty=out-of-phase component4.Summary of Practice
10、4.1 Reference impedance plots in both Nyquist and Bodeformat are included.These reference plots are derived from theresults from nine different laboratories that used a standarddummy cell and followed the standard procedure using a1This practice is under the jurisdiction of ASTM Committee G01 on Cor
11、rosionof Metals and is the direct responsibility of Subcommittee G01.11 on Electrochemi-cal Measurements in Corrosion Testing.Current edition approved Nov.1,2015.Published December 2015.Originallyapproved in 1989.Last previous edition approved in 2010 as G10689(2010).DOI:10.1520/G0106-89R15.2For ref
12、erenced 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
13、.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 specific ferritic type alloy UNS-S430004in 0.005 M H2SO4and 0.495 M Na2SO4.The plots for the reference material arepresented as an envelope that surrounds all of the data with andw
14、ithout inclusion of the uncompensated resistance.Plots forone data set from one laboratory are presented as well.Sincethe results from the dummy cell are independent of laboratory,only one set of results is presented.4.2 A discussion of the electrochemical impedancetechnique,the physics that underli
15、es it,and some methods ofinterpreting the data are given in the Appendix X1 AppendixX6.These sections are included to aid the individual inunderstanding the electrochemical impedance technique andsome of its capabilities.The information is not intended to beall inclusive.5.Significance and Use5.1 Th
16、e availability of a standard procedure,standardmaterial,and standard plots should allow the investigator tocheck his laboratory technique.This practice should lead toelectrochemical impedance curves in the literature which canbe compared easily and with confidence.5.2 Samples of a standard ferritic type 430 stainless steel(UNS 430000)used to obtain the reference plots are availablefor those who wish to check their equipment.Suitable resistorsand capacitors can be obtained from electronics supply