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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 .
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.
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.
5.4 Electrode potentials are used in the estimation of corrosion rates by several methods. One example is by means of Tafel line extrapolation, see Practices and . Polarization resistance measurements are also determined using electrode potential measurements, see Test Method and Guide .
5.5 Corrosion potential measurements are used to determine whether metal surfaces are passive in the environment in question, see Test Method .
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 , , , and .
5.7 Corrosion potentials are used to determine the metallurgical condition of some aluminum alloys, see Test Method . Similar measurements have been used with hot dipped galvanized steel to determine their ability to cathodically polarize steel. See .
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 and NACE TM0190–2012.
5.9 Corrosion potentials are used to evaluate the galvanic performance of alloy pairs for use in seawater and other conductive electrolytes, see Test Method , Guide , and Guide .
5.10 Electrode potential measurements are used to establish cathodic protection levels to troubleshoot cathodic protection systems and to confirm the performance of these systems in soils, concrete, and natural waters, see NACE TM0497, NACE TM0108, and NACE TM0109.
5.11 Electrode potential measurements are necessary for the determination of hydrogen overvoltage values in testing for hydrogen embrittlement and related issues with hydrogen cracking. See .
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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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 Susceptibility 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
NACE StandardsTM0101–2012 TM0113–2013 Evaluating the Accuracy of Field Grade Reference Electrode TM0190–2012 Impressed Current Laboratory Testing of Aluminum Alloy Anodes TM0211–2011 Durability Test for Copper/Copper Sulfate Permanent Reference Electrodes for Direct Burial Applications TM0497–2012 Measurement Techniques Related to Criteria for Cathodic Protection on Underground or Submerged Metallic Piping Systems
ICS Number Code 25.220.99 (Other treatments and coatings); 77.060 (Corrosion of metals)
UNSPSC Code 39121436(Electrodes)
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ASTM G215-17, Standard Guide for Electrode Potential Measurement, ASTM International, West Conshohocken, PA, 2017, www.astm.orgBack to Top