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Open AccessArticle

Improving the Protectiveness of 3-Mercaptopropyl-Trimethoxysilane Coatings on Bronze by Addition of Oxidic Nano- and Microparticles

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“A. Daccò” Corrosion and Metallurgy Study Centre, Engineering Department, University of Ferrara, 44122 Ferrara, Italy
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“A. Daccò” Corrosion and Metallurgy Study Centre, University of Ferrara, 44122 Ferrara, Italy
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Author to whom correspondence should be addressed.
Coatings 2020, 10(3), 225; https://doi.org/10.3390/coatings10030225
Received: 22 January 2020 / Revised: 27 February 2020 / Accepted: 28 February 2020 / Published: 1 March 2020
The protectiveness of coatings based on 3-mercaptopropyl-trimethoxysilane (PropS-SH) applied on bronze artworks was enhanced by investigating and tuning a variety of factors. In particular, the coating performances were optimized by proper additive choice among oxide nanoparticles (CeO2, La2O3, TiO2) and microparticles (fly ash (FA)), and by varying the aging time of the nanoparticle suspensions before coating application and the RT curing time of the coatings. Moreover, the possibility of conservation of the silane solution under refrigerated conditions was assessed. The aggressive environment was a tenfold concentrated synthetic acid rain (AR × 10). The techniques adopted comprised electrochemical tests (polarization curve recording and EIS tests) and SEM-Energy Dispersion Spectroscopy (EDS) observations. In the case of FA microparticles, never used before as additives in silane coatings, further tests were performed in FA suspensions in AR × 10 to clarify the contribution of these particles to PropS-SH coating protectiveness. The tests included pH measurements, elemental chemical analyses, and electrochemical tests on bare bronze. Improved performances of PropS-SH coatings were achieved by La2O3, CeO2, and FA addition, with La2O3 affording the best results during 20 days of immersion. The positive influence of FA was connected to its alkaline character and to the release of soluble silicates. View Full-Text
Keywords: organosilane coatings; synthetic acid rain; oxide nanoparticles; fly ash; bronze organosilane coatings; synthetic acid rain; oxide nanoparticles; fly ash; bronze
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Monticelli, C.; Zanotto, F.; Grassi, V.; Seyedi, M.; Balbo, A. Improving the Protectiveness of 3-Mercaptopropyl-Trimethoxysilane Coatings on Bronze by Addition of Oxidic Nano- and Microparticles. Coatings 2020, 10, 225.

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