Corrosion protective properties of nanostructured sol–gel hybrid coatings to AA2024-T3

The work aims at investigating the corrosion behavior of AA2024-T3 substrates pretreated with sol–gel derived hybrid coatings. The hybrid sols were prepared by copolymerization of 3-Glycidoxypropyltrimethoxysilane (GPTMS), tetraethylortosilicate (TEOS) and tetra- n-propoxyzirconium (TPOZ). Coatings...

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Bibliographic Details
Published in:Surface & coatings technology 2006-02, Vol.200 (9), p.3084-3094
Main Authors: Zheludkevich, M.L., Serra, R., Montemor, M.F., Salvado, I.M. Miranda, Ferreira, M.G.S.
Format: Article
Language:English
Subjects:
AA2024-T3
Applied sciences
Corrosion
Corrosion environments
Corrosion prevention
Cross-disciplinary physics: materials science
rheology
EIS
Exact sciences and technology
Materials science
Metals. Metallurgy
Nanostructured coating
Other topics in materials science
Physics
SKPFM
Sol–gel
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Summary:The work aims at investigating the corrosion behavior of AA2024-T3 substrates pretreated with sol–gel derived hybrid coatings. The hybrid sols were prepared by copolymerization of 3-Glycidoxypropyltrimethoxysilane (GPTMS), tetraethylortosilicate (TEOS) and tetra- n-propoxyzirconium (TPOZ). Coatings with Zr/Si atomic ratios of 1:9 and 1:4 were also prepared. During the synthesis process, there is formation of ZrO 2 nanoparticles, which content depends on the temperature and time of the TPOZ hydrolysis/condensation reactions. The results show that the ZrO 2 nanoparticles have diameters ranging between 40 and 200 nm. These particles are amorphous and they improve the corrosion protection of the sol–gel coatings. The presence of ZrO 2 nanoparticles seems to have a pore blocking effect in the coatings with higher content of particles.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2004.09.007