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Corrosion-resistant mulberry fruit (Morus nigra L.) extracts incorporated hybrid (GPTMS-TEOS) composite silanol coatings for low carbon steel protection

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

The present work aimed at the evaluation of mulberry (Morus nigra L.) fruit extracts-doped hybrid sol–gel coatings’ corrosion resistance performance for low carbon steel in NaCl electrolyte. Alkoxysilane formulation was prepared to utilize 3-glycidoxypropyltrimethoxysilane and tetraethyl orthosilicate precursors. The corrosion inhibitive properties of extracts-doped composite coatings on low carbon steel surface in NaCl electrolyte were determined by exploiting electrochemical impedance spectroscopy, electrochemical noise measurement and potentiodynamic polarization. The corrosion inhibition efficiencies obtained were 85.57% and 81.37% for hybrid coatings doped with mulberry ethanol extract and water extract, respectively. It was noted that the hybrid silanol film applied low carbon steel which was doped with 750 ppm mulberry ethanol extract rendered higher corrosion resistance. Additionally, the Tafel slopes indicated that mulberry extracts function as “mixed type” corrosion inhibitors, particularly prevailing cathodic inhibition. Surface characteristics of coated low carbon steel plates were researched engaging scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and wettability measurement. Fourier transform infrared spectroscopy established Fe–O–Si bonding among mild steel substrate and composite coating. Scanning electron micrographs affirmed that the coating provided better corrosion mitigation due to the inhibitive efficacy of the doping. Wettability analysis revealed that low carbon steel treated with 750 ppm mulberry ethanol extract doped coating was highly hydrophobic.

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Highlights

  • Developed films were coated on low carbon steel by self-assembled monolayer method.

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

  • Mulberry extracts-doped-composite coatings revealed higher charge transfer resistance.

  • Mulberry extracts-doped composite coatings demonstrated improved hydrophobicity.

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

    Nor Atikah Aina Mohamad Azran, Tuan Sherwyn Hamidon, Siti Shafiqah Azahar & M. Hazwan Hussin

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Mohamad Azran, N.A.A., Hamidon, T.S., Azahar, S.S. et al. Corrosion-resistant mulberry fruit (Morus nigra L.) extracts incorporated hybrid (GPTMS-TEOS) composite silanol coatings for low carbon steel protection. J Sol-Gel Sci Technol 105, 734–747 (2023). https://doi.org/10.1007/s10971-022-05993-9

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