Electrochemical Potential Oscillations during Galvanostatic Passivation of Copper in NaNO2 Solutions and Their Role in TGSCC Mechanism

Y. Yagodzinskyy, Pertti Aaltonen, Hannu Hänninen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

Auto-oscillations of the electrochemical potential around its average value close to +100 mVSCE under galvanostatic polarization of pure copper in 0.3M NaNO2 solution were studied in annealed state of copper and during slow strain rate tensile tests of cold-deformed copper. The oscillations occur in the potential range where the passivation current increases dramaticaly due to Cu++ cation generation in the semi-coherent oxide film on the copper substrate. Parameters of the oscillations were measured depending on the polarization conditions. It was supposed that the observed oscillations represent a nonlinear relaxation process in the passive oxide film interacting with the metal substrate at the semi-coherent oxide/metal interface. Based on the idea that cation vacancy balance at the Cu2O/Cu interface depends on the stresses induced in the metal substrate by the interface conditions, a model of the observed nonlinear phenomena was formulated.
Original languageEnglish
Title of host publicationPassivation of Metals and Semiconductors, and Properties of Thin Oxide Layers
Subtitle of host publicationA Selection of Papers from the 9th International Symposium
EditorsPhilippe Marcus, Vincent Maurice
Place of PublicationOxford
PublisherElsevier
Pages525-530
ISBN (Print)978-0-444-52224-5
DOIs
Publication statusPublished - 2006
MoE publication typeA4 Article in a conference publication
Event9th International Symposium on the Passivation of Metals and Semiconductors and the Properties of Thin Oxide Layers, PASSIVITY-9 - Paris, France
Duration: 27 Jun 20051 Jul 2005
Conference number: 9

Conference

Conference9th International Symposium on the Passivation of Metals and Semiconductors and the Properties of Thin Oxide Layers, PASSIVITY-9
Abbreviated titlePASSIVITY-9
Country/TerritoryFrance
CityParis
Period27/06/051/07/05

Keywords

  • copper
  • cuprus oxide
  • cation vacancy
  • galvanostic polarisation
  • electrochemical potential oscillation

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