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Organic modified silica obtained from DBTL polycondensation catalyst for anticorrosive coating

  • Original Paper: Functional coatings, thin films and membranes (including deposition techniques)
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Abstract

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.

Highlights

  • DBTL is proposed as poly-condensation catalyst between TEOS and alkylalkoxysilanes for the formation of anticorrosive coating.

  • ORMOSIL increases the hardness of aluminum surface.

  • DBTL forms ceramic hard coating with excellent adhesion.

  • ORMOSIL–DBTL diminishes the corrosion rate at 60–85%.

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Acknowledgement

The authors wish to acknowledge the financial support of the CONACyT through grant CB-186327/2012 register as SIP-2013-Re/099; also to LICAM-LAB of the University of Guanajuato for SEM analysis. Finally, the authors appreciate the technical support of Daniela Mocada in SEM analysis and Luis A. Hernández.

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Authors and Affiliations

  1. Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato. Instituto Politécnico Nacional. Av. Mineral de Valenciana No. 200 Col. Fracc. Industrial Puerto Interior, C.P, 36275, Silao de la Victoria, Gto, Mexico

    Carmen Salazar-Hernández, Juan Manuel Mendoza-Miranda & Raúl Carrera-Rodríguez

  2. Departamento de Minas, Metalurgia y Geología. División de Ingenierías Campus Guanajuato, Universidad de Guanajuato. Ex Hacienda de San Matías S/N Colonia San Javier, C.P, 36020, San Javier, Gto, Mexico

    Mercedes Salazar-Hernández, Raúl Miranda-Avilés, Enrique Elorza-Rodríguez & María J. Puy-Alquiza

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  1. Carmen Salazar-Hernández
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  2. Mercedes Salazar-Hernández
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  3. Juan Manuel Mendoza-Miranda
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  4. Raúl Miranda-Avilés
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  5. Enrique Elorza-Rodríguez
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  6. Raúl Carrera-Rodríguez
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  7. María J. Puy-Alquiza
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Correspondence to Carmen Salazar-Hernández or Mercedes Salazar-Hernández.

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Salazar-Hernández, C., Salazar-Hernández, M., Mendoza-Miranda, J.M. et al. Organic modified silica obtained from DBTL polycondensation catalyst for anticorrosive coating. J Sol-Gel Sci Technol 87, 299–309 (2018). https://doi.org/10.1007/s10971-018-4732-9

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  • DOI: https://doi.org/10.1007/s10971-018-4732-9

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