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

页码：489 / 492

页数：4

共 19 条

[1] Cerium dioxide as a photocatalyst for water decomposition to O2 in the presence of Ce4+aq and Fe3+aq species [J].

Bamwenda, GR ;

Arakawa, H .

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2000, 161 (1-2) :105-113

[2] A Comparative Study on the Corrosion Resistance of Cerium-Based Conversion Coatings on AZ91D and AZ31B Magnesium Alloys [J].

Castano, C. E. ;

Maddela, S. ;

O'Keefe, M. J. ;

Wang, Y. M. .

COATINGS FOR CORROSION PROTECTION, 2012, 41 (15) :3-12

[3]

Castano CarlosE., 2013, MAGNESIUM TECHNOLOGY, P169

[4] Defect and transport properties of nanocrystalline CeO2-x [J].

Chiang, YM ;

Lavik, EB ;

Kosacki, I ;

Tuller, HL ;

Ying, JY .

APPLIED PHYSICS LETTERS, 1996, 69 (02) :185-187

[5] Characterization of cerium-based conversion coatings for corrosion protection of aluminum alloys [J].

Fahrenholtz, WG ;

O'Keefe, MJ ;

Zhou, HF ;

Grant, JT .

SURFACE & COATINGS TECHNOLOGY, 2002, 155 (2-3) :208-213

[6] Nanostructured oxides in chemistry:: Characterization and properties [J].

Fernández-García, M ;

Martínez-Arias, A ;

Hanson, JC ;

Rodriguez, JA .

CHEMICAL REVIEWS, 2004, 104 (09) :4063-4104

[7] MIXED-VALENT GROUND-STATE OF CEO2 [J].

FUJIMORI, A .

PHYSICAL REVIEW B, 1983, 28 (04) :2281-2283

[8] Oxygen vacancies in transition metal and rare earth oxides: Current state of understanding and remaining challenges [J].

Ganduglia-Pirovano, M. Veronica ;

Hofmann, Alexander ;

Sauer, Joachim .

SURFACE SCIENCE REPORTS, 2007, 62 (06) :219-270

[9] The phase stability of cerium species in aqueous systems -: I.: E-pH diagram for the Ce-HClO4-H2O system [J].

Hayes, SA ;

Yu, P ;

O'Keefe, TJ ;

O'Keefe, MJ ;

Stoffer, JO .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (12) :C623-C630

[10] The effect of post-treatment time and temperature on cerium-based conversion coatings on Al 2024-T3 [J].

Heller, Daimon K. ;

Fahrenholtz, William G. ;

O'Keefe, Matthew J. .

CORROSION SCIENCE, 2010, 52 (02) :360-368

← 1 2 →