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ASTM G5-14(2021)

(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 reference 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 reference test method may not be appropriate for polarization testing of all materials or in all environments.  
3.5 This reference 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 reference test method in this manner is beyond the scope and intended use of this reference test method. Users of this reference 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.
FIG. 1 Typical Standard Potentiodynamic Anodic Polarization Plot
CURRENT DENSITY (μA/cm2)
SCOPE
1.1 This reference test method covers an experimental procedure for checking experimental technique and instrumentation. If followed, this reference 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Jul-2021
ICS
71.040.50 - Physicochemical methods of analysis
Technical Committee
G01 - Corrosion of Metals
Drafting Committee
G01.11 - Electrochemical Measurements in Corrosion Testing
Current Stage
Ref Project

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ASTM G5-14(2021) - Standard Reference Test Method for Making Potentiodynamic Anodic Polarization MeasurementsASTM G5-14(2021) - Standard Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements
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ASTM G5-14(2021) - Standard Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements
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Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: G5 − 14 (Reapproved 2021)
Standard Reference 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 Measurements in Corrosion Testing
G107Guide for Formats for Collection and Compilation of
1.1 This reference test method covers an experimental
Corrosion Data for Metals for Computerized Database
procedureforcheckingexperimentaltechniqueandinstrumen-
Input
tation. If followed, this reference test method will provide
repeatable potentiodynamic anodic polarization measurements
3. Significance and Use
that will reproduce data determined by others at other times
3.1 The availability of a standard procedure, standard
and in other laboratories provided all laboratories are testing
material, and a standard plot should make it easy for an
referencesamplesfromthesamelotofType430stainlesssteel.
investigator to check his techniques. This should lead to
1.2 Units—The values stated in SI units are to be regarded
polarization curves in the literature which can be compared
asstandard.Nootherunitsofmeasurementareincludedinthis
with confidence.
standard.
3.2 Samples of a standard ferritic Type 430 stainless steel
1.3 This standard does not purport to address all of the
(UNS S43000) used in obtaining standard reference plot are
safety concerns, if any, associated with its use. It is the
available for those who wish to check their own test procedure
3
responsibility of the user of this standard to establish appro-
and equipment.
priate safety, health, and environmental practices and deter-
3.3 Standard potentiodynamic polarization plots are shown
mine the applicability of regulatory limitations prior to use.
for a lot of material originally purchased in 1992. This
1.4 This international standard was developed in accor-
reference test method is not applicable for standard material
dance with internationally recognized principles on standard-
purchased before 1992. These reference data are based on the
ization established in the Decision on Principles for the
results from different laboratories that followed the standard
Development of International Standards, Guides and Recom-
procedure, using that material in 1.0 N H SO .The four sigma
2 4
mendations issued by the World Trade Organization Technical
probability bands for current density values are shown at each
Barriers to Trade (TBT) Committee.
potential to indicate the acceptable range of values.
2. Referenced Documents
3.4 This reference test method may not be appropriate for
2
polarization testing of all materials or in all environments.
2.1 ASTM Standards:
E691Practice for Conducting an Interlaboratory Study to
3.5 This reference test method is intended for use in
Determine the Precision of a Test Method
evaluating the accuracy of a given electrochemical test
E1338Guide for Identification of Metals and Alloys in
apparatus, not for use in evaluating materials performance.
Computerized Material Property Databases
Therefore, the use of the plots in Fig. 1 is not recommended to
G3Practice for Conventions Applicable to Electrochemical
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 reference test method in this manner is beyond the
1
This reference test method is under the jurisdiction ofASTM Committee G01
scope and intended use of this reference test method. Users of
onCorrosionofMetalsandisthedirectresponsibilityofG01.11onElectrochemical
this reference test method are advised to evaluate test results
Measurements in Corrosion Testing.
Current edition approved Aug. 1, 2021. Published August 2021. Originally
relative to the scatter bands corresponding to the particular lot
ε1
approved in 1969. Last previous edition approved in 2014 as G5–14 . DOI:
of Type 430 stainless steel that was tested.
10.1520/G0005-14R21.
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
...

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1.1 This test method covers the analysis of cast iron by spark atomic emission spectrometry for the following elements in the ranges shown (Note 1):
Ranges, %  
Elements  
Applicable Range, %  
Quantitative Range, %A  
Carbon  
1.9 to 3.8  
1.90 to 3.8  
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0 to 2.0  
0.025 to 2.0  
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0 to 0.75  
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0 to 1.8  
0.03 to 1.8  
Molybdenum  
0 to 1.2  
0.01 to 1.2  
Nickel  
0 to 2.0  
0.02 to 2.0  
Phosphorus  
0 to 0.4  
0.005 to 0.4  
Silicon  
0 to 2.5  
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Sulfur  
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Note 1: The ranges of the elements listed have been established through cooperative testing of reference materials. These ranges can be extended by the use of suitable reference materials.  
1.2 This test method covers analysis of specimens having a diameter adequate to overlap the bore of the spark stand opening (to effect an argon seal). The specimen thickness should be sufficient to prevent overheating during excitation. A heat sink backing may be used. The maximum thickness is limited only by the height that the stand will permit.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    7 pages
    English language
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  • Standard
    7 pages
    English language
    sale 15% off