ASTM G215-17
(Guide)Standard Guide for Electrode Potential Measurement
Standard Guide for Electrode Potential Measurement
SIGNIFICANCE AND USE
5.1 Electrode potential is the reversible work that is required to transfer a unit of positive charge between the surface in question and a reference electrode through the electrolyte that is in contact with both electrodes. The sign of the electrode potential is determined by the Gibbs Stockholm Convention described in Practice G3.
5.2 The electrode potential of a surface is related to the Gibbs free energy of the oxidation/reduction reactions occurring at the surface in question compared to the Gibbs free energy of the reactions occurring on the reference electrode surface.4
5.3 Electrode potentials are used together with potential-pH (Pourbaix) diagrams to determine the corrosion products that would be in equilibrium with the environment and the electrode surface.5
5.4 Electrode potentials are used in the estimation of corrosion rates by several methods. One example is by means of Tafel line extrapolation, see Practices G3 and G102. Polarization resistance measurements are also determined using electrode potential measurements, see Test Method G59 and Guide G96.
5.5 Corrosion potential measurements are used to determine whether metal surfaces are passive in the environment in question, see Test Method C876.
5.6 Corrosion potential measurements are used in the evaluation of alloys to determine their resistance or susceptibility to various forms of localized corrosion, see Test Methods F746, F2129, G61, and G150.
5.7 Corrosion potentials are used to determine the metallurgical condition of some aluminum alloys, see Test Method G69. Similar measurements have been used with hot dipped galvanized steel to determine their ability to cathodically polarize steel. See Appendix X2.
5.8 Corrosion potentials are used to evaluate aluminum and magnesium alloys as sacrificial anodes for underground and immersion cathodic protection application, see Test Method G97 and NACE TM0190–2012.
5.9 Corrosion potentials are used to evaluate the galvanic performanc...
SCOPE
1.1 This guide provides guidance on the measurement of electrode potentials in laboratory and field studies both for corrosion potentials and polarized potentials.
1.2 The values stated in SI units are to be regarded as standard. Any other units of measurements included in this standard are present because of their wide usage and acceptance.
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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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: G215 − 17
Standard Guide for
1
Electrode Potential Measurement
This standard is issued under the fixed designation G215; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope ceptibility of Iron-, Nickel-, or Cobalt-Based Alloys
G69Test Method for Measurement of Corrosion Potentials
1.1 This guide provides guidance on the measurement of
of Aluminum Alloys
electrode potentials in laboratory and field studies both for
G71Guide for Conducting and Evaluating Galvanic Corro-
corrosion potentials and polarized potentials.
sion Tests in Electrolytes
1.2 The values stated in SI units are to be regarded as
G82Guide for Development and Use of a Galvanic Series
standard. Any other units of measurements included in this
for Predicting Galvanic Corrosion Performance
standard are present because of their wide usage and accep-
G96Guide for Online Monitoring of Corrosion in Plant
tance.
Equipment (Electrical and Electrochemical Methods)
1.3 This standard does not purport to address all of the G97Test Method for Laboratory Evaluation of Magnesium
safety concerns, if any, associated with its use. It is the
SacrificialAnodeTest Specimens for UndergroundAppli-
responsibility of the user of this standard to establish appro- cations
priate safety and health practices and determine the applica-
G102Practice for Calculation of Corrosion Rates and Re-
bility of regulatory limitations prior to use. lated Information from Electrochemical Measurements
G106Practice for Verification of Algorithm and Equipment
2. Referenced Documents
for Electrochemical Impedance Measurements
2
G150Test Method for Electrochemical Critical PittingTem-
2.1 ASTM Standards:
perature Testing of Stainless Steels
C876Test Method for Corrosion Potentials of Uncoated
G193Terminology and Acronyms Relating to Corrosion
Reinforcing Steel in Concrete
3
2.2 NACE Standards:
F746Test Method for Pitting or Crevice Corrosion of
TM0497–2012Measurement Techniques Related to Criteria
Metallic Surgical Implant Materials
for Cathodic Protection on Underground or Submerged
F2129Test Method for Conducting Cyclic Potentiodynamic
Metallic Piping Systems
Polarization Measurements to Determine the Corrosion
TM0101–2012Measurement Techniques Related to Criteria
Susceptibility of Small Implant Devices
for Cathodic Protection of Underground Storage Tank
F3044Test Method for Test Method for Evaluating the
Systems
Potential for Galvanic Corrosion for Medical Implants
TM0108–2012Testing of Catalyzed Titanium Anodes for
G3Practice for Conventions Applicable to Electrochemical
Use in Soils or Natural Waters
Measurements in Corrosion Testing
TM0109–2009Aboveground Survey Techniques for the
G5Reference Test Method for Making Potentiodynamic
Evaluation of Underground Pipeline Coating Condition
Anodic Polarization Measurements
TM0190–2012Impressed Current Laboratory Testing of
G59TestMethodforConductingPotentiodynamicPolariza-
Aluminum Alloy Anodes
tion Resistance Measurements
TM0211–2011Durability Test for Copper/Copper Sulfate
G61Test Method for Conducting Cyclic Potentiodynamic
Permanent Reference Electrodes for Direct Burial Appli-
Polarization Measurements for Localized Corrosion Sus-
cations
TM0113–2013Evaluating theAccuracy of Field Grade Ref-
erence Electrode
1
This guide is under the jurisdiction ofASTM Committee G01 on Corrosion of
Metals and is the direct responsibility of Subcommittee G01.11 on Electrochemical
3. Terminology
Measurements in Corrosion Testing.
Current edition approved Jan. 1, 2017. Published January 2017. Originally
3.1 Definitions—The terminology used herein shall be in
approved in 2016. Last previous edition approved in 2016 as G215–16. DOI:
accordance with Terminology G193.
10.1520/G0215-17.
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
3
Standards volume information, refer to the standard’s Document Summary page on AvailablefromNACEInternational(NACE),15835ParkTenPl.,Houston,TX
the ASTM website. 77084, http://www.nace.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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G215 − 17
4. Summary of Practice systems and to confirm the performance of these systems in
soils,concrete,andnaturalwaters,seeNACETM0497,NACE
4.1 Electrode potential measurements are made by electri
...
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: G215 − 16 G215 − 17
Standard Guide for
1
Electrode Potential Measurement
This standard is issued under the fixed designation G215; 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 guide provides guidance on the measurement of electrode potentials in laboratory and field studies both for corrosion
potentials and polarized potentials.
1.2 The values stated in SI units are to be regarded as standard. Any other units of measurements included in this standard are
present because of their wide usage and acceptance.
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:
C876 Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete
F746 Test Method for Pitting or Crevice Corrosion of Metallic Surgical Implant Materials
F2129 Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements to Determine the Corrosion Suscepti-
bility of Small Implant Devices
F3044 Test Method for Test Method for Evaluating the Potential for Galvanic Corrosion for Medical Implants
G3 Practice for Conventions Applicable to Electrochemical Measurements in Corrosion Testing
G5 Reference Test Method for Making Potentiodynamic Anodic Polarization Measurements
G59 Test Method for Conducting Potentiodynamic Polarization Resistance Measurements
G61 Test Method for Conducting Cyclic Potentiodynamic Polarization Measurements for Localized Corrosion Susceptibility of
Iron-, Nickel-, or Cobalt-Based Alloys
G69 Test Method for Measurement of Corrosion Potentials of Aluminum Alloys
G71 Guide for Conducting and Evaluating Galvanic Corrosion Tests in Electrolytes
G82 Guide for Development and Use of a Galvanic Series for Predicting Galvanic Corrosion Performance
G96 Guide for Online Monitoring of Corrosion in Plant Equipment (Electrical and Electrochemical Methods)
G97 Test Method for Laboratory Evaluation of Magnesium Sacrificial Anode Test Specimens for Underground Applications
G102 Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements
G106 Practice for Verification of Algorithm and Equipment for Electrochemical Impedance Measurements
G150 Test Method for Electrochemical Critical Pitting Temperature Testing of Stainless Steels
G193 Terminology and Acronyms Relating to Corrosion
3
2.2 NACE Standards:
TM0497–2012 Measurement Techniques Related to Criteria for Cathodic Protection on Underground or Submerged Metallic
Piping Systems
TM0101–2012 Measurement Techniques Related to Criteria for Cathodic Protection of Underground Storage Tank Systems
TM0108–2012 Testing of Catalyzed Titanium Anodes for Use in Soils or Natural Waters
TM0109–2009 Aboveground Survey Techniques for the Evaluation of Underground Pipeline Coating Condition
TM0190–2012 Impressed Current Laboratory Testing of Aluminum Alloy Anodes
1
This guide is under the jurisdiction of ASTM Committee G01 on Corrosion of Metals and is the direct responsibility of Subcommittee G01.11 on Electrochemical
Measurements in Corrosion Testing.
Current edition approved May 1, 2016Jan. 1, 2017. Published May 2016January 2017. Originally approved in 2016. Last previous edition approved in 2016 as G215 – 16.
DOI: 10.1520/G0215-16.10.1520/G0215-17.
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
Available from NACE International (NACE), 15835 Park Ten Pl., Houston, TX 77084, http://www.nace.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
G215 − 17
TM0211–2011 Durability Test for Copper/Copper Sulfate Permanent Reference Electrodes for Direct Burial Applications
TM0113–2013 Evaluating the Accuracy of Field Grade Reference Electrode
3. Terminology
3.1 Definitions—The terminology used herein shall be in accordance with Terminol
...
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