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X-Ray Absorption Study of Electrochemically Grown Oxide Films on AlCr Sputtered Alloys II. In Situ Studies

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Title: X-Ray Absorption Study of Electrochemically Grown Oxide Films on AlCr Sputtered Alloys II. In Situ Studies
Creators: Frankel, G. S.; Schrott, A. G.; Davenport, A. J.; Isaacs, H. S.; Jahnes, C. V.; Russak, M. A.
Keywords: sputter-deposited chromium
AlCr thin films
x-ray absorption
Issue Date: 1994
Citation: Frankel, G. S.; Schrott, A. G.; Davenport, A. J.; Isaacs, H. S.; Jahnes, C. V.; Russak, M. A. "X-Ray Absorption Study of Electrochemically Grown Oxide Films on AlCr Sputtered Alloys II. In Situ Studies," Journal of the Electrochemical Society, v. 141, no. 1, 1994, pp. 83-90.
Abstract: The chemistry of chromium in the passive film on sputter-deposited chromium and AlCr thin films has been investigated in situ in an electrochemical cell under potential control by studying x-ray absorption near edge structure. At high potentials, Cr in the AlCr alloys was oxidized to the 6-valent state. Depending on the rate of potential increase, 6-valent chromium either dissolved from the alloy or was trapped in the passive film where it was electroactive, i.e., the valence state could be reversibly switched between the 3- and 6-valent states by changing the applied potential. The kinetics of these processes were investigated. Ex situ x-ray photoelectron spectroscopy measurements indicated that, during slow scanning at low potentials, the composition of both the surface oxide and underlying metallic layers changed. These changes resulted in a structure that was susceptible to transpassive dissolution of Cr at potentials above 0.2 V(MSE).
URI: http://hdl.handle.net/1811/44528
ISSN: 0013-4651 (print)
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