Preparation and characterization of cerium doped silica sol-gel coatings on glass and aluminum substrates

被引:124
作者
Pepe, A
Aparicio, M
Ceré, S
Durán, A
机构
[1] CSIC, Inst Ceram & Vidrio, Madrid 28049, Spain
[2] Consejo Nacl Invest Cient & Tecn, INTEMA, Mar Del Plata, Argentina
关键词
D O I
10.1016/j.jnoncrysol.2004.08.141
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Chromates are among the most common substances used as corrosion inhibitors. However, these compounds are highly toxic, and an intense effort is being undertaken to replace them. Cerium compounds seem to fulfil the basic requirements for consideration as alternative corrosion inhibitors. The aim of this work was to study the effect of the incorporation of cerium ions in silica sol-gel coatings on aluminum alloys as potential replacement of chromate treatments. The main idea was to combine the 'barrier' effect of silica coatings with the 'corrosion inhibitor' effect of the cerium inside the coatings. Thin (below 1 mum for a single layer) and transparent cerium doped silica sol-gel coatings were prepared by dipping 3005 aluminum alloys in so]-gel solutions. Ultra-violet-visible spectra (UV-vis) show that cerium ions, Ce3+ and Ce4+, always are present in the coatings, independently of the cerium salt or firing atmosphere used. Active protection with single and two layer coatings prepared with Cc (IV) salt seems to improve corrosion protection of the coated aluminum while coatings prepared with Ce(III) salt only entails a protection when applied as a two layer, possibly due to sealing of pre-existent defects in the first layer. The improvement of active protection with immersion time would imply that corrosion is inhibited by cerium ions that migrate through the coating to the site of the attack (a defect in the coatings) and then react to passivate the site. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:162 / 171
页数:10
相关论文
共 38 条
[1]   Cerium: a suitable green corrosion inhibitor for tinplate [J].
Arenas, MA ;
Conde, A ;
de Damborenea, JJ .
CORROSION SCIENCE, 2002, 44 (03) :511-520
[2]   Inhibition of 5083 aluminium alloy and galvanised steel by lanthanide salts [J].
Arenas, MA ;
Bethencourt, M ;
Botana, FJ ;
de Damborenea, J ;
Marcos, M .
CORROSION SCIENCE, 2001, 43 (01) :157-170
[3]   Rare earth doped sol-gel materials as potential absorbance standards [J].
Aubonnet, S ;
Perry, CC .
JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 300 :224-229
[4]   LANTHANIDE SALTS AS ALTERNATIVE CORROSION-INHIBITORS [J].
BERNAL, S ;
BOTANA, FJ ;
CALVINO, JJ ;
MARCOS, M ;
PEREZOMIL, JA ;
VIDAL, H .
JOURNAL OF ALLOYS AND COMPOUNDS, 1995, 225 (1-2) :638-641
[5]   Lanthanide compounds as environmentally-friendly corrosion inhibitors of aluminium alloys:: A review [J].
Bethencourt, M ;
Botana, FJ ;
Calvino, JJ ;
Marcos, M ;
Rodríguez-Chacón, MA .
CORROSION SCIENCE, 1998, 40 (11) :1803-1819
[6]  
*CMS100 SYST, 1996, OP MAN ADD CHANG CE
[7]   ELECTROCHEMICAL-BEHAVIOR OF SIO2 SOL-GEL COATINGS ON STAINLESS-STEEL [J].
DEDAMBORENEA, J ;
PELLEGRI, N ;
DESANCTIS, O ;
DURAN, A .
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY, 1995, 4 (03) :239-244
[8]   PROTECTIVE GLASS COATINGS ON METALLIC SUBSTRATES [J].
DESANCTIS, O ;
GOMEZ, L ;
PELLEGRI, N ;
PARODI, C ;
MARAJOFSKY, A ;
DURAN, A .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 1990, 121 (1-3) :338-343
[9]   Formation and UV absorption of cerium, europium and terbium ions in different valencies in glasses [J].
Ebendorff-Heidepriem, H ;
Ehrt, D .
OPTICAL MATERIALS, 2000, 15 (01) :7-25
[10]   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