ASTM G5-1994(2011)e1 Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements《制定恒电位和动电位阳极极化测量值的标准参考试验方法》.pdf
《ASTM G5-1994(2011)e1 Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements《制定恒电位和动电位阳极极化测量值的标准参考试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM G5-1994(2011)e1 Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements《制定恒电位和动电位阳极极化测量值的标准参考试验方法》.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G5 94 (Reapproved 2011)1Standard Reference Test Method forMaking Potentiostatic and Potentiodynamic AnodicPolarization Measurements1This standard is issued under the fixed designation G5; the number immediately following the designation indicates the year of originaladoption or, in the
2、case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1NOTEUpdated units statement and text editorially in November 2011.1. Scope1.1 This test method covers a
3、n experimental procedure forchecking experimental technique and instrumentation. If fol-lowed, this test method will provide repeatable potentiostaticand potentiodynamic anodic polarization measurements thatwill reproduce data determined by others at other times and inother laboratories provided all
4、 laboratories are testing referencesamples from the same lot of Type 430 stainless steel.1.2 UnitsThe values stated in SI units are to be regardedas standard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, a
5、ssociated 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:2E1338 Guide for Identification of Metals and Alloys in
6、Computerized Material Property DatabasesG3 Practice for Conventions Applicable to ElectrochemicalMeasurements in Corrosion TestingG107 Guide for Formats for Collection and Compilation ofCorrosion Data for Metals for Computerized DatabaseInput3. Significance and Use3.1 The availability of a standard
7、procedure, standard ma-terial, and a standard plot should make it easy for an investi-gator to check his techniques. This should lead to polarizationcurves in the literature which can be compared with confi-dence.3.2 Samples of a standard ferritic Type 430 stainless steel(UNS S43000) used in obtaini
8、ng standard reference plot areavailable for those who wish to check their own test procedureand equipment.33.3 Standard potentiostatic and potentiodynamic polariza-tion plots are supplied with the purchase of the referencematerial. These reference data are based on the results fromdifferent laborato
9、ries that followed the standard procedure,using that material in 1.0 N H2SO4. Maximum and minimumcurrent values are shown at each potential to indicate theacceptable range of values.3.4 This test method may not be appropriate for polarizationtesting of all materials or in all environments.3.5 This t
10、est method is intended for use in evaluating theaccuracy of a given electrochemical test apparatus, not for usein evaluating materials performance. Therefore, the use of theplots in Figs. 1 and 2 or Appendix X2 is not recommended toevaluate alloys other than Type 430, or lots of Type 430 otherthan t
11、hose available throughASTM. The use of the data in thistest method in this manner is beyond the scope and intendeduse of this test method. Users of this test method are advised toevaluate test results relative to the scatter bands correspondingto the particular lot of Type 430 stainless steel that w
12、as tested.4. Apparatus4.1 The test cell should be constructed to allow the follow-ing items to be inserted into the solution chamber: the testelectrode, two auxiliary electrodes, a Luggin capillary withsalt-bridge connection to the reference electrode, inlet andoutlet for an inert gas, and a thermom
13、eter. The test cell shall beconstructed of materials that will not corrode, deteriorate, orotherwise contaminate the test solution.1This test method is under the jurisdiction of ASTM Committee G01 onCorrosion of Metals and is the direct responsibility of G01.11 on ElectrochemicalMeasurements in Corr
14、osion Testing.Current edition approved Nov. 15, 2011. Published May 2012. Originallyapproved in 1969. Last previous edition approved in 2004 as G594(2004). DOI:10.1520/G0005-94R11E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.
15、org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3These standard samples are available from Metal Samples, P.O. Box 8,Mumford, AL 36268. Generally, one sample can be repolished and reused for manyruns. This procedure is suggest
16、ed to conserve the available material.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.NOTE 1Borosilicate glass and TFE-fluorocarbon have been foundsuitable.4.1.1 A suitable cell is shown in Fig. 3 (1).4A 1-L,roundbottom flask has bee
17、n modified by the addition of variousnecks to permit the introduction of electrodes, gas inlet andoutlet tubes, and a thermometer. The Luggin probe-salt bridgeseparates the bulk solution from the saturated calomel refer-ence electrode, and the probe tip can be easily adjusted to bringit in close pro
18、ximity with the working electrode.4.2 Potentiostat (Note 2):4.2.1 Apotentiostat that will maintain an electrode potentialwithin 1 mV of a preset value over a wide range of appliedcurrents should be used. For the type and size of standardspecimen supplied, the potentiostat should have a potentialrang
19、e from 0.6 to 1.6 V and an anodic current output rangefrom 1.0 to 105A.4.3 Potential-Measuring Instruments (Note 2):4The boldface numbers in parentheses refer to the list of references at the end ofthis test method.CURRENT DENSITY (A/cm2)FIG. 1 Typical Standard Potentiostatic Anodic Polarization Plo
20、tCURRENT DENSITY (A/cm2)FIG. 2 Typical Standard Potentiodynamic Anodic Polarization PlotG5 94 (2011)124.3.1 The potential-measuring circuit should have a highinput impedance on the order of 1011to 1014V to minimizecurrent drawn from the system during measurements. Suchcircuits are provided with most
21、 potentiostats. Instrumentsshould have sufficient sensitivity and accuracy to detect achange of 1.0 mV over a potential range between 0.6 and 1.6V.4.4 Current-Measuring Instruments (Note 2):4.4.1 An instrument that is capable of measuring a currentaccurately to within 1 % of the absolute value over
22、a currentrange between 1.0 and 105A for a Type 430 stainless steel(UNS S43000) specimen with a surface area of approximately5cm2.4.5 Anodic Polarization Circuit:4.5.1 A schematic potentiostatic anodic polarization wiringdiagram (2) is illustrated in Fig. 4.4.5.2 A scanning potentiostat is used for p
23、otentiodynamicmeasurements. For such measurements the potentiostat shall becapable of automatically varying the potential at a constant ratebetween two preset potentials. A record of the potential andcurrent is plotted continuously using such instruments as anX-Y recorder and a logarithmic converter
24、 incorporated into thecircuit shown in Fig. 4. Some potentiostats have an output ofthe logarithm of the current as a voltage, which allows directplotting of the potential log current curve using an X-Yrecorder.NOTE 2The instrumental requirements are based upon values typicalof the instruments in 15
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