VALENCE AND CORE PHOTOEMISSION OF THE FILMS FORMED ELECTROCHEMICALLY ON ALUMINUM IN NITRIC-ACID

被引:17
作者
THOMAS, S [1 ]
SHERWOOD, PMA [1 ]
机构
[1] KANSAS STATE UNIV AGR & APPL SCI,DEPT CHEM,WILLARD HALL,MANHATTAN,KS 66506
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1993年 / 89卷 / 02期
关键词
D O I
10.1039/ft9938900263
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The chemical composition of the oxide films formed on aluminium after electrochemical oxidation in nitric acid solution has been examined by valence and core photoemission. Angle-resolved X-ray photoemission in the valence band indicated that the films in 0.5 mol dm-3 nitric acid consisted of a mixed composition at less positive potentials consisting of a gibbsite [Al(OH)3] surface with an inner layer of gamma-Al2O3. At more positive potentials the film consisted entirely of gamma-Al2O3. In more concentrated acid (5 mol dm -3) , especially for longer (60 min) exposure time, the films were essentially gamma-Al2O3.
引用
收藏
页码:263 / 266
页数:4
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