Making a superior oxide corrosion passivation layer on aluminum using ozone

Citation
A. Kuznetsova et al., Making a superior oxide corrosion passivation layer on aluminum using ozone, LANGMUIR, 17(7), 2001, pp. 2146-2152
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
0743-7463 → ACNP
Volume
17
Issue
7
Year of publication
2001
Pages
2146 - 2152
Database
ISI
SICI code
0743-7463(20010403)17:7<2146:MASOCP>2.0.ZU;2-J
Abstract
Aluminum oxidation by ozone produces an aluminum oxide layer which is super ior in its corrosion properties compared to natural oxide, as measured by e lectrochemical methods. The electrochemically measured impedance of the O-3 -grown films is similar to 10 times greater than that of O-2-grown films of equivalent thickness. An enhanced pitting potential is observed for the O- 3-grown oxide film. Transmission electron microscopy results show that the pore size of O-3-grown oxide films is considerably smaller than that of O-2 -grown films. Transmission electron microscopy electron diffraction studies show that the amorphous O-3-grown films are similar to 4% more dense than the O-2-grown film. The initial sticking coefficient for ozone on atomicall y clean polycrystalline aluminum is 3.8 times larger than for oxygen at 300 K