skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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 Imore » in the X axis. Therefore, how this plot of Delta E/Delta I is analyzed is a matter of current debate.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
894779
Report Number(s):
UCRL-TR-218665
TRN: US200702%%332
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CORROSION; ELECTROLYTES; POLARIZATION

Citation Formats

Wong, L L, King, K J, Martin, S I, and Rebak, R B. Methods of Calculation of Resistance to Polarization (Corrosion Rate) Using ASTM G 59. United States: N. p., 2006. Web. doi:10.2172/894779.
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. United States. https://doi.org/10.2172/894779
Wong, L L, King, K J, Martin, S I, and Rebak, R B. 2006. "Methods of Calculation of Resistance to Polarization (Corrosion Rate) Using ASTM G 59". United States. https://doi.org/10.2172/894779. https://www.osti.gov/servlets/purl/894779.
@article{osti_894779,
title = {Methods of Calculation of Resistance to Polarization (Corrosion Rate) Using ASTM G 59},
author = {Wong, L L and King, K J and Martin, S I and Rebak, R B},
abstractNote = {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.},
doi = {10.2172/894779},
url = {https://www.osti.gov/biblio/894779}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Feb 05 00:00:00 EST 2006},
month = {Sun Feb 05 00:00:00 EST 2006}
}