TEOS/GPTMS Silane Sol-Gel Hybrid Film for Corrosion Protection of Carbon Steel

Santos, Sérgio Leonardo Butski Soares; Freitas, Fagner Luiz da Costa; Benvenuti, Tatiane; Capelossi, Vera Rosa

doi:10.1007/978-981-16-4921-9_179-1

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“…Chromatization and phosphating are widely used commercial pretreatments, but they are harmful to the environment and human health 7 . Silanes are organofunctional molecules with organic and inorganic properties, such as TEOS (tetraethylorthosilane), acting as a coupling agent on the inorganic surface of the metal and organic surfaces of future coatings, being a potential sustainable substitute for commercial pretreatments 8 .…”

Section: Introductionmentioning

confidence: 99%

TEOS Silane Film Modified with SBA-15 Loaded with Cocoa Husk Extract as Pretreatment of ASTM 1008 Steel

Silva,

Carrijo-Gonçalves,

Barreto

et al. 2024

Mat. Res.

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Research on eco-friendly methods led to the investigation of natural inhibitors and silane films modified with nanostructured mesoporous silica (SBA-15), a molecular sieve that can carry molecules with inhibitory properties. Combining natural extracts such as cocoa husk with SBA-15 aims to develop an enhanced silane-based pretreatment. This involves obtaining an alcoholic extract, and then mixing it with SBA-15 to modify the silane film. Different concentrations (1%, 2%, and 3%) of SBA-15 loaded with extract were prepared. Electrochemical tests, especially electrochemical impedance spectroscopy (EIS), in a 0.1 mol/L NaCl solution, revealed improved corrosion resistance with the tetraethylorthosilane (TEOS) film modified using 3% SBA-15 loaded with extract. Scanning electron microscopy showed the film and SBA-15 on the steel surface, while Fourier transform infrared spectroscopy identified functional groups characteristic of SBA-15, pure or loaded, and silane film. Therefore, it was possible to enhance the TEOS silane film by adding SBA-15 loaded with plant residue extract.

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Section: Introductionmentioning

confidence: 99%