Measuring the Repassivation Potential of Alloy 22 Using the Potentiodynamic - Galvanostatic - Potentiostatic Method

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Traditionally, the susceptibility of Alloy 22 (N06022) to suffer crevice corrosion has been measured using the Cyclic Potentiodynamic Polarization (CPP) technique (ASTM G 61). When the alloy is not very susceptible to crevice corrosion, the values of repassivation potential obtained using the CPP technique are not highly reproducible. To circumvent the large uncertainty in the values of the repassivation potential by the CPP method, the repassivation potential of Alloy 22 may be measured using a slower method that combines sequentially potentiodynamic, galvanostatic and potentiostatic treatments (this method is called the Tsujikawa-Hisamatsu Electrochemical or THE method). In the THE method the ... continued below

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Evans, K J & Rebak, R B April 27, 2007.

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Traditionally, the susceptibility of Alloy 22 (N06022) to suffer crevice corrosion has been measured using the Cyclic Potentiodynamic Polarization (CPP) technique (ASTM G 61). When the alloy is not very susceptible to crevice corrosion, the values of repassivation potential obtained using the CPP technique are not highly reproducible. To circumvent the large uncertainty in the values of the repassivation potential by the CPP method, the repassivation potential of Alloy 22 may be measured using a slower method that combines sequentially potentiodynamic, galvanostatic and potentiostatic treatments (this method is called the Tsujikawa-Hisamatsu Electrochemical or THE method). In the THE method the anodic charge is applied to the specimen in a more controlled manner, which avoids driving the alloy to transpassivity and therefore results in more reproducible repassivation potential values. Results using THE method under various testing conditions are presented. A new standard has been prepared for ASTM balloting for the THE method. The round robin matrix results are also discussed.

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PDF-file: 18 pages; size: 0.3 Mbytes

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  • Presented at: Symposim on Advances in Electrochemical Techniques for Corrosion Monitoring and Measurement, Norfolk, VA, United States, May 22 - May 23, 2007

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  • Report No.: UCRL-CONF-230669
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 920492
  • Archival Resource Key: ark:/67531/metadc902097

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  • April 27, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 6, 2016, 1:16 p.m.

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Evans, K J & Rebak, R B. Measuring the Repassivation Potential of Alloy 22 Using the Potentiodynamic - Galvanostatic - Potentiostatic Method, article, April 27, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc902097/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.