Protective coatings for AA 2024 based on cyclotetrasiloxane and various alkoxysilanes
| Autor: | Romana Cerc Korošec, Matjaž Koželj, Angelja K. Surca, Lidija Slemenik Perše, Miran Gaberšček, Mirjana Rodošek |
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| Rok vydání: | 2017 |
| Předmět: |
In situ
Materials science General Chemical Engineering Analytical chemistry 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Corrosion chemistry.chemical_compound symbols.namesake Coating General Materials Science Spectroscopy Polarization (electrochemistry) General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Dielectric spectroscopy chemistry Siloxane engineering symbols 0210 nano-technology Raman spectroscopy Nuclear chemistry |
| Zdroj: | Corrosion Science. 126:55-68 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2017.06.011 |
| Popis: | An alkoxysilyl-functionalised precursor, 1,3,5,7-tetramethyl-1,3,5,7-tetra-(2-(3-trimethoxysilyl)propylsulfanyl)ethyl-cyclotetrasiloxane was synthesized to produce protective coatings. The addition of bis-end-capped 1,2-bis(trimethoxysilyl)ethane and various alkoxysilanes led to formation of more crosslinked coatings as evidenced by 29 Si NMR and IR reflection-absorption spectroscopy. The structural changes during forced anodic polarization were followed using ex situ IR reflection-absorption and in situ Raman spectroelectrochemistry. The former technique shows hydration of coatings and cleavage of some siloxane bonds. In situ Raman bands revealed decrease in intensity, while imaging enabled to follow pit formation. The potentiodynamic polarization, impedance spectroscopy and exposure in salt chamber showed that coating with hexadecyltrimethoxysilane is the most efficient. |
| Databáze: | OpenAIRE |
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