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Corrosion performance of rosemary-extract-doped TEOS:TMSM sol-gel coatings on 304L stainless steel

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Abstract

Pure and rosemary-extract-doped hybrid nanostructure coatings have been generated using sols synthesized via acid catalyzed hydrolysis and condensation of methacryloxypropyltrimethoxysilane (TMSM) and tetraethoxysilane (TEOS) at the molar ratio of 1: 1, in combination with rosemary extract. Coatings have been deposited on stainless steel (SS) 304L substrates by spin coating followed by curing at room temperature for 24 h in air and characterized. The morphology, composition and adhesion of hybrid sol-gel coatings have been examined by SEM, EDX and pull-off test, respectively. Addition of high additive concentrations (0.1%) did not disorganize the sol-gel network. Direct pull-off test recorded a mean coating-substrate bonding strength larger than 23.21 MPa for the hybrid sol-gel coating. Corrosion testing of coatings on SS 304L was studied by potentiodynamic polarization measurements and electrochemical impedance spectroscopy after 1 h and 21 days exposure to the physiological saline solution. The corrosion resistances of hybrid rosemary-extract-doped coatings after 1 h and 21 days exposure to the physiological saline solution were higher than that of pure hybrid silica coatings, both of which had thicknesses ranging lower than 100 nm. Also the electrochemical beha-viors of doped coating were studied by potentiodynamic polarizations tests in 3.5% NaCl media and the results were shown that this system is applicable in industry.

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Authors and Affiliations

  1. Department of Material Science and Engineering, Najafabad Branch, Islamic Azad University, Isfahan, 85141-43131, Iran

    M. Nasr-Esfahani, M. Pourriahi & A. Motalebi

  2. Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran

    A. Ashrafi

Authors
  1. M. Nasr-Esfahani
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  2. M. Pourriahi
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  3. A. Ashrafi
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  4. A. Motalebi
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Correspondence to M. Nasr-Esfahani.

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Nasr-Esfahani, M., Pourriahi, M., Ashrafi, A. et al. Corrosion performance of rosemary-extract-doped TEOS:TMSM sol-gel coatings on 304L stainless steel. Surf. Engin. Appl.Electrochem. 50, 337–345 (2014). https://doi.org/10.3103/S1068375514040097

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  • DOI: https://doi.org/10.3103/S1068375514040097

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