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<p>This study reports the development and evaluation of hybrid SiO<sub>2</sub>-based coatings modified with polyurethane, polydimethylsiloxane (PDMS), and dimethyldiethoxysilane (DMDES) using the sol–gel process for the corrosion protection of API 5L X52 steel. The coatings were applied by dip-coating at controlled withdrawal rates and tested in single and multilayer systems. Characterization was performed by SEM, AFM, and FT-IR, while electrochemical impedance spectroscopy was used to assess corrosion resistance. Results show that multilayer coatings applied at 10&#xa0;cm/min exhibited strong adhesion and barrier properties. The TEOS–PDMS–DMDES system achieved the lowest RMS roughness (2.045&#xa0;nm) and provided enhanced corrosion resistance for up to 312&#xa0;h in Na<sub>2</sub>SO<sub>4</sub> solution, surpassing conventional hybrid coatings. These findings demonstrate that hybrid sol–gel coatings combining inorganic and organic phases can effectively improve the durability of steels exposed to aggressive environments.</p> Graphical abstract <p></p>

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Evaluation of organic–inorganic coating on API steels

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Adolfo Rodrigo Torres-Ortiz,
  • Elsa Miriam Arce-Estrada,
  • Elizabeth Abigail Cerda-Macedo,
  • Marisol Hernandez-Aburto,
  • Lucía Tellez-Jurado

摘要

This study reports the development and evaluation of hybrid SiO2-based coatings modified with polyurethane, polydimethylsiloxane (PDMS), and dimethyldiethoxysilane (DMDES) using the sol–gel process for the corrosion protection of API 5L X52 steel. The coatings were applied by dip-coating at controlled withdrawal rates and tested in single and multilayer systems. Characterization was performed by SEM, AFM, and FT-IR, while electrochemical impedance spectroscopy was used to assess corrosion resistance. Results show that multilayer coatings applied at 10 cm/min exhibited strong adhesion and barrier properties. The TEOS–PDMS–DMDES system achieved the lowest RMS roughness (2.045 nm) and provided enhanced corrosion resistance for up to 312 h in Na2SO4 solution, surpassing conventional hybrid coatings. These findings demonstrate that hybrid sol–gel coatings combining inorganic and organic phases can effectively improve the durability of steels exposed to aggressive environments.

Graphical abstract