ASTM G5-13
(Test Method)Standard Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements
Standard Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements
SIGNIFICANCE AND USE
3.1 The availability of a standard procedure, standard material, and a standard plot should make it easy for an investigator to check his techniques. This should lead to polarization curves in the literature which can be compared with confidence.
3.2 Samples of a standard ferritic Type 430 stainless steel (UNS S43000) used in obtaining standard reference plot are available for those who wish to check their own test procedure and equipment.3
3.3 Standard potentiodynamic polarization plots are shown for a lot of material originally purchased in 1992. This test method is not applicable for standard material purchased before 1992. These reference data are based on the results from different laboratories that followed the standard procedure, using that material in 1.0 N H2SO4. The four sigma probability bands for current density values are shown at each potential to indicate the acceptable range of values.
3.4 This test method may not be appropriate for polarization testing of all materials or in all environments.
3.5 This test method is intended for use in evaluating the accuracy of a given electrochemical test apparatus, not for use in evaluating materials performance. Therefore, the use of the plots in Fig. 1 is not recommended to evaluate alloys other than Type 430, or lots of Type 430 other than those available through Metal Samples. The use of the data in this test method in this manner is beyond the scope and intended use of this test method. Users of this test method are advised to evaluate test results relative to the scatter bands corresponding to the particular lot of Type 430 stainless steel that was tested.CURRENT DENSITY (μA/cm2)
FIG. 1 Typical Standard Potentiodynamic Anodic Polarization Plot
SCOPE
1.1 This test method covers an experimental procedure for checking experimental technique and instrumentation. If followed, this test method will provide repeatable potentiodynamic anodic polarization measurements that will reproduce data determined by others at other times and in other laboratories provided all laboratories are testing reference samples from the same lot of Type 430 stainless steel.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: G5 − 13
StandardReference Test Method for
Making Potentiodynamic Anodic Polarization
1
Measurements
This standard is issued under the fixed designation G5; the number immediately following the designation indicates the year of original
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Samples of a standard ferritic Type 430 stainless steel
(UNS S43000) used in obtaining standard reference plot are
1.1 This test method covers an experimental procedure for
available for those who wish to check their own test procedure
checking experimental technique and instrumentation. If
3
and equipment.
followed, this test method will provide repeatable potentiody-
namic anodic polarization measurements that will reproduce
3.3 Standard potentiodynamic polarization plots are shown
data determined by others at other times and in other labora-
for a lot of material originally purchased in 1992. This test
tories provided all laboratories are testing reference samples
method is not applicable for standard material purchased
from the same lot of Type 430 stainless steel.
before1992.Thesereferencedataarebasedontheresultsfrom
different laboratories that followed the standard procedure,
1.2 Units—The values stated in SI units are to be regarded
asstandard.Nootherunitsofmeasurementareincludedinthis usingthatmaterialin1.0NH SO .Thefoursigmaprobability
2 4
standard. bands for current density values are shown at each potential to
indicate the acceptable range of values.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.4 Thistestmethodmaynotbeappropriateforpolarization
responsibility of the user of this standard to establish appro-
testing of all materials or in all environments.
priate safety and health practices and determine the applica-
3.5 This test method is intended for use in evaluating the
bility of regulatory limitations prior to use.
accuracy of a given electrochemical test apparatus, not for use
2. Referenced Documents
in evaluating materials performance. Therefore, the use of the
2
plotsinFig.1isnotrecommendedtoevaluatealloysotherthan
2.1 ASTM Standards:
E1338Guide for Identification of Metals and Alloys in Type 430, or lots of Type 430 other than those available
through Metal Samples.The use of the data in this test method
Computerized Material Property Databases
G3Practice for Conventions Applicable to Electrochemical inthismannerisbeyondthescopeandintendeduseofthistest
Measurements in Corrosion Testing method. Users of this test method are advised to evaluate test
G107Guide for Formats for Collection and Compilation of results relative to the scatter bands corresponding to the
Corrosion Data for Metals for Computerized Database
particular lot of Type 430 stainless steel that was tested.
Input
4. Apparatus
3. Significance and Use
4.1 The test cell should be constructed to allow the follow-
3.1 The availability of a standard procedure, standard
ing items to be inserted into the solution chamber: the test
material, and a standard plot should make it easy for an
electrode, two auxiliary electrodes, a Luggin capillary with
investigator to check his techniques. This should lead to
salt-bridge connection to the reference electrode, inlet and
polarization curves in the literature which can be compared
outletforaninertgas,andathermometer.Thetestcellshallbe
with confidence.
constructed of materials that will not corrode, deteriorate, or
otherwise contaminate the test solution.
1
This test method is under the jurisdiction of ASTM Committee G01 on
Corrosion of Metals and is the direct responsibility of G01.11 on Electrochemical
NOTE 1—Borosilicate glass and TFE-fluorocarbon have been found
Measurements in Corrosion Testing.
suitable.
Current edition approved Feb. 1, 2013. Published February 2013. Originally
approved in 1969. Last previous edition approved in 2012 as G5–12. DOI:
10.1520/G0005-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM These standard samples are available from Metal Samples, 152 Metal Samples
Standards volume information, refer to the standard’s Document Summary page on Rd., Mumford,AL 36268. Generally, one sample can be repolished and reused for
the ASTM website. many runs. This procedure is suggested to conserve the available material.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G5−13
2
CURRENT DENSITY (µA/cm )
FIG. 1 Typical Standard Potentiodynamic Anodic Polarization Plot
4
4.1
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: G5 − 12 G5 − 13
Standard Reference Test Method for
Making Potentiostatic and Potentiodynamic Anodic
1
Polarization Measurements
This standard is issued under the fixed designation G5; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers an experimental procedure for checking experimental technique and instrumentation. If followed,
this test method will provide repeatable potentiostatic and potentiodynamic anodic polarization measurements that will reproduce
data determined by others at other times and in other laboratories provided all laboratories are testing reference samples from the
same lot of Type 430 stainless steel.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
E1338 Guide for Identification of Metals and Alloys in Computerized Material Property Databases
G3 Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing
G107 Guide for Formats for Collection and Compilation of Corrosion Data for Metals for Computerized Database Input
3. Significance and Use
3.1 The availability of a standard procedure, standard material, and a standard plot should make it easy for an investigator to
check his techniques. This should lead to polarization curves in the literature which can be compared with confidence.
3.2 Samples of a standard ferritic Type 430 stainless steel (UNS S43000) used in obtaining standard reference plot are available
3
for those who wish to check their own test procedure and equipment.
3.3 Standard potentiostatic and potentiodynamic polarization plots are shown for a lot of material originally purchased in 1992.
This test method is not applicable for standard material purchased before 1992. These reference data are based on the results from
different laboratories that followed the standard procedure, using that material in 1.0 N H SO . The four sigma probability bands
2 4
for current density values are shown at each potential to indicate the acceptable range of values.
3.4 This test method may not be appropriate for polarization testing of all materials or in all environments.
3.5 This test method is intended for use in evaluating the accuracy of a given electrochemical test apparatus, not for use in
evaluating materials performance. Therefore, the use of the plots in Figs. 1 and 2Fig. 1 is not recommended to evaluate alloys other
than Type 430, or lots of Type 430 other than those available through ASTM. Metal Samples. The use of the data in this test method
in this manner is beyond the scope and intended use of this test method. Users of this test method are advised to evaluate test results
relative to the scatter bands corresponding to the particular lot of Type 430 stainless steel that was tested.
1
This test method is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of G01.11 on Electrochemical Measurements
in Corrosion Testing.
Current edition approved Nov. 15, 2012Feb. 1, 2013. Published February 2013. Originally approved in 1969. Last previous edition approved in 20112012 as
ε1
G5–94(2011)G5 .–12. DOI: 10.1520/G0005-12.10.1520/G0005-13.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
These standard samples are available from Metal Samples, P.O. Box 8, 152 Metal Samples Rd., Mumford, AL 36268. Generally, one sample can be repolished and reused
for many runs. This procedure is suggested to conserve the available material.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G5 − 13
2
CURRENT DENSITY (μA/cm )
FIG. 21 Typical Standard Potentiodynamic Anodic Po
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