Corrosion Study of Cr-Oxide Ceramics Using Rotating Ring Disk Electrode

Abstract

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The Chalkboard: A Positive Spin on Corrosion Measurements: The Rotating Ring-Disk Electrode

“…Using a disk electrode made of a material of interest, one can employ the ring to detect and quantify the release of soluble species from the disk occurring as a result of its degradation during free corrosion or under electrochemical polarization. This approach may provide key information about the oxidation state of the species dissolving from the disk surface [16][17][18][19][20] or allow the identification and quantification of individual components dissolving from an alloy, [21][22][23][24][25] oxide, 26,27 or even a polymer. 28 For example, the dissolution of magnetite, Fe 3 O 4 , an oxide containing both ferrous and ferric ions, was deconvoluted to determine the relative amounts of Fe(II) and Fe(III) released under open-circuit conditions and at different applied potentials to quantify the contributions of congruent dissolution and reductive dissolution mechanisms to the overall process as a function of potential, as can be seen in Fig.…”