Anodic oxidation of silver alloys in concentrated sulfuric acid solutions

被引：2
|
作者：
Grishina, EP
Udalova, AM
Rumyantsev, EM
机构：
[1] Russian Acad Sci, Inst Chem Solut, Ivanovo 153045, Russia
[2] Ivanovo State Univ Chem Technol, Ivanovo 153007, Russia
来源：
RUSSIAN JOURNAL OF ELECTROCHEMISTRY | 2003年 / 39卷 / 08期
关键词：
silver alloys; anodic oxidation; passivation; sulfuric acid;
D O I：
10.1023/A:1025172609768
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Anodic oxidation of Ag-Cu and Ag-Pd alloys in concentrated sulfuric acid solutions is studied by cyclic voltammetry. Influence of electronegative (Cu) and electropositive (Pd) constituents on the rate and mechanism of the silver electrooxidation in non-steady-state conditions is revealed. The maximum silver oxidation current increases with the copper content due to a decreased H2SO4 concentration in the near-electrode layer and increased solubility of passivating phase Ag2SO4. The mechanism of ionization of palladium-doped silver is complicated by two electrochemical reactions involving the formation of Ag2SO4 and Ag-solv(+).
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页码：903 / 906
页数：4
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