Organic modified silica obtained from DBTL polycondensation catalyst for anticorrosive coating
| Autor: | Raúl Carrera-Rodríguez, Enrique Elorza-Rodríguez, Carmen Salazar-Hernández, María Jesús Puy-Alquiza, Juan Manuel Mendoza-Miranda, Raúl Miranda-Avilés, Mercedes Salazar-Hernández |
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| Rok vydání: | 2018 |
| Předmět: |
Condensation polymer
Materials science 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences Corrosion Biomaterials chemistry.chemical_compound Brinell scale Coating Materials Chemistry Silanes General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Hardness Silane 0104 chemical sciences Electronic Optical and Magnetic Materials Solvent chemistry Chemical engineering Ceramics and Composites engineering 0210 nano-technology |
| Zdroj: | Journal of Sol-Gel Science and Technology. 87:299-309 |
| ISSN: | 1573-4846 0928-0707 |
| Popis: | DBTL as neutral polycondensation catalyst was employed to obtain organic modified silanes (ORMOSILs), which were studied as anticorrosive films for aluminum at saline corrosion. The ORMOSILs were synthesized using TEOS as silica precursor, different alkylalkoxysilanes (trimethoxy(methyl)silane, triethoxy(octyl)silane, 3-aminopropyl(triethoxy)silane and DBTL-catalyst were employed under the free solvent sol–gel process. Results of chemical characterization of ORMOSILs coatings show that under SEM technique coatings have homogenous films, and there are a crosslinking between silica and organic modified under the Infrared spectroscopy and 29Si CPMAS-NMR techniques. On the other hand, Brinell hardness and Pull-Off adhesion tests show that all ORMOSILs increase the aluminum surface hardness between 1 and 10%, and the ORMOSILs critical forces for adhesion are in the range of 106–132 N; therefore, the ORMOSILs coatings have an excellent adhesion to aluminum surface, furthermore, the saline corrosion test shows that organic modified silica avoid the pitting aluminum corrosion; corrosion rate decreases about 60–85%; the anticorrosive behavior according to modified-silica was determined as: SiO2–NH2 > SiO2–Me ∼ SiO2–Octyl. |
| Databáze: | OpenAIRE |
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