ASTM G61-86(2003)

Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-Based Alloys

SCOPE
1.1 This test method gives a procedure for conducting cyclic potentiodynamic polarization measurements to determine relative susceptibility to localized corrosion (pitting and crevice corrosion) for iron-, nickel-, or cobalt-based alloys in a chloride environment. This test method also describes an experimental procedure which can be used to check one's experimental technique and instrumentation.  
1.2  This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2003
• ICS: 77.060 - Corrosion of metals
• Technical Committee: G01 - Corrosion of Metals
• Drafting Committee: G01.11 - Electrochemical Measurements in Corrosion Testing

Relations

• Replaces: ASTM G61-86(1998) - Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-Based Alloys
• Effective Date: 01-Oct-2003
• Replaced By: ASTM G61-86(2003)e1 - Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of Iron-, Nickel-, or Cobalt-Based Alloys
• Effective Date: 01-Oct-2003
• Referred By: ASTM G46-21 - Standard Guide for Examination and Evaluation of Pitting Corrosion
• Effective Date: 01-Oct-2003
• Referred By: ASTM G199-09(2020)e1 - Standard Guide for Electrochemical Noise Measurement
• Effective Date: 01-Oct-2003
• Referred By: ASTM G192-08(2020)e1 - Standard Test Method for Determining the Crevice Repassivation Potential of Corrosion-Resistant Alloys Using a Potentiodynamic-Galvanostatic-Potentiostatic Technique
• Effective Date: 01-Oct-2003
• Referred By: ASTM F2129-19a - Standard Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements to Determine the Corrosion Susceptibility of Small Implant Devices
• Effective Date: 01-Oct-2003
• Referred By: ASTM G215-17 - Standard Guide for Electrode Potential Measurement
• Effective Date: 01-Oct-2003
• Referred By: ASTM B1015-20 - Standard Practice for Form and Style of Standards Relating to Refined Nickel and Cobalt and Their Alloys
• Effective Date: 01-Oct-2003
• Referred By: ASTM G108-23 - Standard Test Methods for Electrochemical Reactivation (EPR) for Detecting Sensitization of AISI Type 304 and 304L Stainless Steels
• Effective Date: 01-Oct-2003
• Referred By: ASTM F1875-98(2022) - Standard Practice for Fretting Corrosion Testing of Modular Implant Interfaces: Hip Femoral Head-Bore and Cone Taper Interface
• Effective Date: 01-Oct-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:G61–86(Reapproved2003)
Standard Test Method for
Conducting Cyclic Potentiodynamic Polarization
Measurements for Localized Corrosion Susceptibility of
1
Iron-, Nickel-, or Cobalt-Based Alloys
ThisstandardisissuedunderthefixeddesignationG61;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2 Ingeneral,onceinitiated,localizedcorrosioncanpropa-
gate at some potential more electropositive than that at which
1.1 This test method covers a procedure for conducting
the hysteresis loop is completed. In this test method, the
cyclic potentiodynamic polarization measurements to deter-
potential at which the hysteresis loop is completed is deter-
mine relative susceptibility to localized corrosion (pitting and
mined at a fixed scan rate. In these cases, the more electrop-
crevicecorrosion)foriron-,nickel-,orcobalt-basedalloysina
ositive the potential at which the hysteresis loop is completed
chloride environment. This test method also describes an
the less likely it is that localized corrosion will occur.
experimental procedure which can be used to check one’s
3.3 If followed, this test method will provide cyclic poten-
experimental technique and instrumentation.
tiodynamic anodic polarization measurements that will repro-
1.2 This standard does not purport to address all of the
duce data developed at other times in other laboratories using
safety concerns, if any, associated with its use. It is the
this test method for the two specified alloys discussed in 3.4.
responsibility of the user of this standard to establish appro-
The procedure is used for iron-, nickel-, or cobalt-based alloys
priate safety and health practices and determine the applica-
in a chloride environment.
bility of regulatory limitations prior to use.
3.4 A standard potentiodynamic polarization plot is in-
2. Referenced Documents
cluded.These reference data are based on the results from five
different laboratories that followed the standard procedure,
2.1 ASTM Standards:
2
using specific alloys of Type 304 stainless steel, UNS S30400
D1193 Specification for Reagent Water
4
and Alloy C-276, UNS N10276. Curves are included which
G3 PracticeforConventionsApplicabletoElectrochemical
3
have been constructed using statistical analysis to indicate the
Measurements in Corrosion Testing
acceptable range of polarization curves.
G5 Reference Test Method for Making Potentiostatic and
3
3.5 The availability of a standard test method, standard
Potentiodynamic Anodic Polarization Measurements
material, and standard plots should make it easy for an
3. Significance and Use
investigator to check his techniques to evaluate susceptibility
to localized corrosion.
3.1 An indication of the susceptibility to initiation of local-
ized corrosion in this test method is given by the potential at
4. Apparatus
whichtheanodiccurrentincreasesrapidly.Themorenoblethis
4.1 The polarization cell should be similar to the one
potential, obtained at a fixed scan rate in this test, the less
described in Practice G5. Other polarization cells may be
susceptible is the alloy to initiation of localized corrosion.The
equally suitable.
resultsofthistestarenotintendedtocorrelateinaquantitative
4.1.1 The cell should have a capacity of about 1 L and
manner with the rate of propagation that one might observe in
should have suitable necks or seals to permit the introduction
service when localized corrosion occurs.
of electrodes, gas inlet and outlet tubes, and a thermometer.
The Luggin probe-salt bridge separates the bulk solution from
thesaturatedcalomelreferenceelectrode.Theprobetipshould
1
This test method is under the jurisdiction of ASTM Committee G01 on
beadjustablesothatitcanbebroughtintocloseproximitywith
Corrosion of Metals and is the direct responsibility of Subcommittee G01.11 on
the working electrode.
Electrochemical Measurements in Corrosion Testing.
Current edition approved October 1, 2003. Published October 2003. Originally
approved in 1986. Last previous edition approved in 1998 as G 61–86 (1998).
2 4
Annual Book of ASTM Standards, Vol 11.01. These standard samples are available as a set of one of each type fromASTM
3
Annual Book of ASTM Standards, Vol 03.02. Headquarters at a nominal cost Order PCN ADJG0061.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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G61–86 (2003)
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4.2 Specimen Holder: 10 µAshouldbeused.Manycommercialunitshaveabuild-in
4.2.1 Specimens should be mounted in a suitable holder instrument with an output as a voltage, which is preferred for
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designe
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