期刊
PROGRESS IN ORGANIC COATINGS
卷 124, 期 -, 页码 286-295出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2018.02.025
关键词
Aluminium; Corrosion; Hybrid sol-gel; Chemical stability; Multi-nuclear NMR spectroscopy
资金
- Slovenian Research Agency [P2-0393]
- project Lightweight alloys based on aluminium as materials with increasing potential in transport industry - Slovenian Research Agency [J1-6734]
The aim of this study was to prepare transparent hybrid sol-gel coatings to serve as a barrier for corrosion protection of aluminium. The coatings were synthesised using silicon precursors tetraethyl orthosilicate (TEOS) and organically modified silicon precursor 3-methacryloxypropyltrimethoxysilane (MAPTMS) which were then mixed with different amounts of zirconium(IV) propoxide (ZTP) chelated using methacrylic acid (MAA). The synthesis process was followed using in-situ Fourier transform infrared spectroscopy and liquid-state H-1, C-13 and Si-29 nuclear magnetic resonance spectroscopy. The coating properties, such as transparency, topography, chemical composition, morphology and wettability were evaluated. Corrosion properties were analysed using electrochemical methods in similar to 0.1 N NaCl in a pH range between 3 and 10. The chemical stability was evaluated in strongly alkaline solution. Homogeneous composition of the coatings was achieved through condensation reactions between Si- and Zr-based precursors. Obtained coatings were highly transparent, increased the contact water angle for polar and non-polar liquids compared to bare substrate, and improved the cleaning properties. The electrochemical measurements confirmed remarkable barrier protection in NaCl solutions of various pHs, especially for coatings with high Zr/Si ratios. In harsh media such as 0.1 N NaOH, the coating with low Zr/Si ratio was more stable. The results were interpreted in terms of different degrees of polycondensation of Si species as a function of Zr content in the coating. The importance of chemical speciation of the sol during synthesis were emphasised as this affects the subsequent coating properties.
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