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Characterization and corrosion inhibition studies of protective sol–gel films modified with tannin extracts on low carbon steel

  • Original Paper: Industrial and technological applications of sol-gel and hybrid materials
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Abstract

In the present work, tannins extracted from tamarind shells using water (TWE) and ethyl acetate (TEAE) were introduced into fabricated sol–gel containing 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) which were subsequently assembled over mild steel surface. The corrosion inhibitive behavior of the prepared layers in 0.5 M HCl was experimented by exploiting potentiodynamic polarization and electrochemical impedance spectroscopy analyses. Optimized GPTMS-TEOS alkoxysilane films’ functional groups were corroborated exploiting Fourier transform infrared spectroscopy. Surface morphology, elemental composition and wetting property of the optimized coatings were explored via scanning electron microscopy, energy dispersive X-ray spectroscopy and wetting angle studies, respectively. The result of the electrochemical studies revealed that the maximum inhibition efficiency achieved at 1000 ppm was up to 90%. With regards to FTIR spectra, the infrared bands at −1046 and −935 cm−1 confirmed the formation of (Si–O–Si) and (Fe–O–Si) covalent bonds. The presence of this peak indicates the formation of networks between the mild steel substrate and silicate. The study has revealed that tannins doped GPTMS-TEOS silanol matrix enhanced the protection ability by promoting crosslinking reactions of the coatings compared to undoped coatings to a significant extent.

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Highlights

  • GPTMS-TEOS coatings were applied on mild steel by self-assembled monolayer method.

  • icorr values of developed coatings were significantly lower than uncoated substrate.

  • Tannin extracts doped (GPTMS-TEOS)/Fe showed higher charge transfer resistance.

  • Developed coatings showed improved hydrophobic characteristics.

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Acknowledgements

The funding for the present study was offered by Universiti Sains Malaysia through USM External Grant-304/PKIMIA/6501087/U162.

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Authors and Affiliations

  1. Hassan Usman Katsina Polytechnic, P.M.B 2052, Katsina State, Nigeria

    Abdullahi Abdulmajid

  2. Materials Technology Research Group (MaTReC), School of Chemical Sciences, Universiti Sains Malaysia, 11800, Minden, Penang, Malaysia

    Tuan Sherwyn Hamidon & M. Hazwan Hussin

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  1. Abdullahi Abdulmajid
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Abdulmajid, A., Hamidon, T.S. & Hussin, M.H. Characterization and corrosion inhibition studies of protective sol–gel films modified with tannin extracts on low carbon steel. J Sol-Gel Sci Technol 104, 287–299 (2022). https://doi.org/10.1007/s10971-022-05941-7

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