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Influence of TEOS Content on Anti-corrosion Property of Mercapto Functional Organic Silane Based Sol-gel Coatings on Copper Alloy Surface postprint

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Abstract: Organic-inorganic hybrid sol-gel coatings with high solid content were prepared on copper surface by means of hydrolysis-condensation reaction. 3-Mercaptopropyltrimethoxysilane (MPTMS), tetraethylorthosilicate (TEOS) and hydrochloric acid were used as organic precursor, inorganic precursor and catalysts respectively. The chemical composition, and the average size of solparticles and the surface- and cross section-morphology of sol-gel coatings were characterized by Fourier transform infrared spectroscopy, dynamic light scattering particle size analyzer and field emission scanning electron microscopy respectively. The adhesion and corrosion performance of sol-gel coatings were investigated by pull-off adhesion tester and electrochemical workstation. The results showed that the thermo-stability of the coatings was significantly improved due to the addition of TEOS. However, the average size of sol particles increased with the increase of TEOS content. Excessive addition of TEOS can induce holes and cracks on the surface of coatings or within the coatings. The coatings owned the best corrosion resistance when the molar ratio of TEOS to MPTMS was 0.6 due to their larger crosslinking density and fewer defects.

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[V1] 2023-03-31 20:19:54 ChinaXiv:202303.10479V1 Download
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