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<p>In this paper, we present the synthesis and characterization of hybrid coatings based on silica modified using polydimethylsiloxane containing methyl and methylphenyl groups in its linear chain. The synthesis was conducted using a polycondensation catalyst (di-butyl dilaurate tin; DBTL) and in the absence of a solvent. Infrared spectroscopy indicates the formation of two silica clusters and the presence of the main functional groups. In addition, TGA–DSC analysis corroborated the formation of a polysiloxane chain bonded to the formed silica. Moreover, atomic force microscopy (AFM) revealed a modification in the microstructure of the coatings. Consequently, the functional group has been demonstrated to modify the anticorrosive behavior of the ceramic. This conclusion is corroborated by the results obtained by EIS, which demonstrate that the R<sub>estimated</sub>, defined as the diameter of the semicircle in the Nyquist diagram, increased by 10–16 times for uncoated aluminum, 28–33 times for the SiO<sub>2</sub>/DMS-CH<sub>3</sub> coating, and 28–33 times for the SiO<sub>2</sub>/PDS coating. These findings suggest that the SiO<sub>2</sub>/PDS coating exhibits a greater anticorrosive capacity than the SiO<sub>2</sub>/DMS-CH<sub>3</sub> coating, particularly as the siloxane chain content in the ceramic increases. Moreover, the PDS functional group (CH<sub>3</sub> and phenyl) demonstrates a greater effect on the anticorrosive behavior.</p> Graphical Abstract <p></p>

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Hybrid Silica (SiO2/PDMS) anticorrosive coating: EIS-analysis and effect of functional groups in PDMS chains

  • 期刊论文

  • 发表日期：

    2026年2月5日

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  • Mercedes Salazar-Hernández,
  • Juan Carlos Baltazar-Vera,
  • Juan Manuel Mendoza-Miranda,
  • Enrique Elorza-Rodríguez,
  • Jesús E. Rodríguez-Dahmlow,
  • Raúl Miranda-Avilés,
  • Joel Moreno-Palmerín,
  • Carmen Salazar-Hernández

摘要

In this paper, we present the synthesis and characterization of hybrid coatings based on silica modified using polydimethylsiloxane containing methyl and methylphenyl groups in its linear chain. The synthesis was conducted using a polycondensation catalyst (di-butyl dilaurate tin; DBTL) and in the absence of a solvent. Infrared spectroscopy indicates the formation of two silica clusters and the presence of the main functional groups. In addition, TGA–DSC analysis corroborated the formation of a polysiloxane chain bonded to the formed silica. Moreover, atomic force microscopy (AFM) revealed a modification in the microstructure of the coatings. Consequently, the functional group has been demonstrated to modify the anticorrosive behavior of the ceramic. This conclusion is corroborated by the results obtained by EIS, which demonstrate that the Restimated, defined as the diameter of the semicircle in the Nyquist diagram, increased by 10–16 times for uncoated aluminum, 28–33 times for the SiO2/DMS-CH3 coating, and 28–33 times for the SiO2/PDS coating. These findings suggest that the SiO2/PDS coating exhibits a greater anticorrosive capacity than the SiO2/DMS-CH3 coating, particularly as the siloxane chain content in the ceramic increases. Moreover, the PDS functional group (CH3 and phenyl) demonstrates a greater effect on the anticorrosive behavior.

Graphical Abstract