Chemical composition and corrosion protection of silane films modified with CeO2 nanoparticles

被引：277
作者：
Montemor, M. F. [1 ]
Pinto, R. [1 ]
Ferreira, M. G. S. [1 ,2 ]
机构：
[1] Univ Tecn Lisboa, Inst Super Tecn, ICEMS, DEQB, P-1049001 Lisbon, Portugal
[2] Univ Aveiro, Dept Ceram & Glass Engn, CICECO, P-3810193 Aveiro, Portugal
来源：
ELECTROCHIMICA ACTA | 2009年 / 54卷 / 22期
关键词：
Ceria; Silanes; Pre-treatments; Self-healing; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; SELF-HEALING PROPERTIES; GALVANIZED STEEL; ACTIVATED NANOPARTICLES; CERIUM(III) NITRATE; ALUMINUM CORROSION; MAGNESIUM ALLOY; SODIUM-SILICATE; NACL SOLUTIONS; THIN-FILMS;
D O I：
10.1016/j.electacta.2009.01.053
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The present work aims at understanding the role of CeO2 nanoparticles (with and without activation in cerium(III) solutions) used as fillers for hybrid silane coatings applied on galvanized steel substrates. The work reports the improved corrosion protection performance of the modified silane films and discusses the chemistry of the cerium-activated nanoparticles, the mechanisms involved in the formation of the surface coatings and its corrosion inhibition ability. The anti-corrosion performance was investigated using electrochemical impedance spectroscopy (EIS), the scanning vibrating electrode technique (SVET) and d.c. potentiodynamic polarization. The chemical composition of silanised nanoparticles and the chemical changes of the silane solutions due to the presence of additives were studied using X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance spectroscopy (NMR), respectively. The NMR and XPS data revealed that the modified silane solutions and respective coatings have enhanced cross-linking and that silane-cerium bonds are likely to occur. Electrochemical impedance spectroscopy showed that the modified coatings have improved barrier properties and the SVET measurements highlight the corrosion inhibition effect of ceria nanoparticles activated with Ce(III) ions. Potentiodynamic polarization curves demonstrate an enhanced passive domain for zinc, in the presence of nanoparticles, in solutions simulating the cathodic environment. (C) 2009 Elsevier Ltd. All rights reserved.
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页码：5179 / 5189
页数：11
相关论文
共 66 条
[1]   Surface characterisation of IrO2/TiO2/CeO2 oxide electrodes and Faradaic impedance investigation of the oxygen evolution reaction from alkaline solution [J].
Alves, VA ;
da Silva, LA ;
Boodts, JFC .
ELECTROCHIMICA ACTA, 1998, 44 (8-9) :1525-1534
[2]   Corrosion mechanisms of phosphated zinc layers on steel as substrates for automotive coatings [J].
Amirudin, A ;
Thierry, D .
PROGRESS IN ORGANIC COATINGS, 1996, 28 (01) :59-75
[3]   Self-healing mechanism of an organosiloxane polymer film containing sodium silicate and cerium(III) nitrate for corrosion of scratched zinc surface in 0.5 M NaCl [J].
Aramaki, K .
CORROSION SCIENCE, 2002, 44 (07) :1621-1632
[4]   Preparation of chromate-free, self-healing polymer films containing sodium silicate on zinc pretreated in a cerium(III) nitrate solution for preventing zinc corrosion at scratches in 0.5 M NaCl [J].
Aramaki, K .
CORROSION SCIENCE, 2002, 44 (06) :1375-1389
[5]   Cerium(IV)oxide modification by inclusion of a hetero-atom: A strategy for producing efficient and robust nano-catalysts for methanol carboxylation [J].
Aresta, Michele ;
Dibenedetto, Angela ;
Pastore, Carlo ;
Cuocci, Corrado ;
Aresta, Brunella ;
Cometa, Stefania ;
De Giglio, Elvira .
CATALYSIS TODAY, 2008, 137 (01) :125-131
[6]   The effect of pretreatments with siloxanes on the corrosion resistance of aluminium in NaCl solution [J].
Beccaria, AM ;
Padeletti, G ;
Montesperelli, G ;
Chiaruttini, L .
SURFACE & COATINGS TECHNOLOGY, 1999, 111 (2-3) :240-246
[7]   The inhibitive action of metacryloxypropylmethoxysilane (MAOS) on aluminium corrosion in NaCl solutions [J].
Beccaria, AM ;
Chiaruttini, L .
CORROSION SCIENCE, 1999, 41 (05) :885-899
[8]   Reversal of the surface charge of a mineral powder: application to electrophoretic deposition of silica for anticorrosion coatings [J].
Cabot, B ;
Foissy, A .
JOURNAL OF MATERIALS SCIENCE, 1998, 33 (15) :3945-3952
[9]   Analytical characterisation and corrosion behaviour of bis-[triethoxysilylpropyl]tetrasulphide pre-treated AA2024-T3 [J].
Cabral, A ;
Duarte, RG ;
Montemor, MF ;
Zheludkevich, ML ;
Ferreira, MGS .
CORROSION SCIENCE, 2005, 47 (03) :869-881
[10]   Silicon dioxide coating of CeO2 nanoparticles by solid state reaction at room temperature [J].
Cui, HT ;
Hong, GY ;
Wu, XY ;
Hong, YJ .
MATERIALS RESEARCH BULLETIN, 2002, 37 (13) :2155-2163
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