Photo-assisted reduction in nanostructured cerium-based coatings

被引：13
|
作者：
Castano, Carlos E. [1 ]
O'Keefe, Matthew J. [1 ]
Fahrenholtz, William G. [1 ]
机构：
[1] Missouri Univ Sci & Technol, Mat Res Ctr, Dept Mat Sci & Engn, Rolla, MO 65409 USA
来源：
SCRIPTA MATERIALIA | 2013年 / 69卷 / 06期
关键词：
Photochemical reaction; Cerium oxides; Nanostructured materials; Magnesium alloys; AQUEOUS SYSTEMS; PHASE-STABILITY; CEO2; DIAGRAM; OXIDE;
D O I：
10.1016/j.scriptamat.2013.06.010
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Nanostructured cerium-based coatings on AZ31 Mg alloy substrates exposed to sunlight under ambient conditions had an similar to 30% increase in Ce(III) species compared to unexposed coatings as measured by X-ray photoelectron spectroscopy. A decrease in film cracks and shift in bandgap from 2.5 eV to 2.7 eV were also measured. Visible changes in color, from yellow to translucent, with exposure were also observed and suggest that cerium-based coatings are reduced by light exposure in humid environments. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：489 / 492
页数：4
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