Methods of Calculation of Resistance to Polarization (Corrosion Rate) Using ASTM G 59

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The corrosion rate of a metal (alloy) can be measured using: (1) Immersion tests or weight loss such as in ASTM G 1 and G 31 or (2) Electrochemical techniques such as in ASTM G 59. In the polarization resistance (PR) or linear polarization method (G 59), the resistance to polarization (Rp) of a metal is measured in the electrolyte of interest in the vicinity of the corrosion potential (E{sub corr}). This polarization resistance can be mathematically converted into corrosion rates (CR). A plot of E vs. I in the vicinity of E{sub corr} is generated by increasing the potential ... continued below

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Wong, L L; King, K J; Martin, S I & Rebak, R B February 5, 2006.

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The corrosion rate of a metal (alloy) can be measured using: (1) Immersion tests or weight loss such as in ASTM G 1 and G 31 or (2) Electrochemical techniques such as in ASTM G 59. In the polarization resistance (PR) or linear polarization method (G 59), the resistance to polarization (Rp) of a metal is measured in the electrolyte of interest in the vicinity of the corrosion potential (E{sub corr}). This polarization resistance can be mathematically converted into corrosion rates (CR). A plot of E vs. I in the vicinity of E{sub corr} is generated by increasing the potential at a fixed rate of 0.1667 mV/s and measuring the output current. The polarization resistance (Rp) is defined as the slope of a potential (E) (Y axis) vs. Current (I) (X axis) plot in the vicinity of the corrosion potential (E{sub corr}). When the potential is ramped and the current is measured, E is the independent variable and I is the dependent variable. In a proper mathematical plot, E should be represented in the X axis and I in the Y axis. However, in the conventions of the corrosion community, E is always plotted in the Y axis and I in the X axis. Therefore, how this plot of Delta E/Delta I is analyzed is a matter of current debate.

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PDF-file: 19 pages; size: 0.3 Mbytes

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  • Report No.: UCRL-TR-218665
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/894779 | External Link
  • Office of Scientific & Technical Information Report Number: 894779
  • Archival Resource Key: ark:/67531/metadc891073

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • February 5, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 8:05 p.m.

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Wong, L L; King, K J; Martin, S I & Rebak, R B. Methods of Calculation of Resistance to Polarization (Corrosion Rate) Using ASTM G 59, report, February 5, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc891073/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.