X-RAY-ABSORPTION STUDY OF ELECTROCHEMICALLY GROWN OXIDE-FILMS ON ALCR SPUTTERED ALLOYS

被引：20

作者：

FRANKEL, GS ^{[1
]}

SCHROTT, AG ^{[1
]}

DAVENPORT, AJ ^{[1
]}

ISAACS, HS ^{[1
]}

JAHNES, CV ^{[1
]}

RUSSAK, MA ^{[1
]}

机构：

[1] BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 1994年 / 141卷 / 01期

关键词：

D O I：

10.1149/1.2054714

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

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).

引用

页码：83 / 90

页数：8

共 13 条

[1]

[Anonymous], 1966, ATLAS ELECTROCHEMICA

[2] INSITU XANES DETECTION OF CR(VI) IN THE PASSIVE FILM ON FE-26CR [J].