Synthesis and Characterization of Anti-Scratch and Anti-Corrosion Hybrid Nanocomposite Coatings Based on Sol-Gel Process
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ORIGINAL PAPER
Synthesis and Characterization of Anti-Scratch and Anti-Corrosion Hybrid Nanocomposite Coatings Based on Sol-Gel Process Leila Shasti Karimi 1 & Sahar Amiri 1 & Mariam Hosseini Zori 2 Received: 24 July 2020 / Accepted: 16 September 2020 # Springer Nature B.V. 2020
Abstract Hybrid nanocomposite coatings containing SiO2, TiO2, ZnO, and ZrO2 particles were synthesized based on sol-gel precursors, including tetraethoxysilane (TEOS), 3glycidoxypropyl trimethoxysilane (GPTMS), tetra(nbutylorthotitanate) (TBT), zinc acetate dihydrate, and zirconium chloride (IV). The nanocomposites were characterized using FTIR, SEM, DLS, and EDAX methods. Results indicated that the size of the inorganic particles was in the range of nanometer (283.3, 163.5, 99.2, and 2.5 nm for ZrO2, SiO2, ZnO, and TiO2, respectively) with a very uniform distribution and dispersion. Hybrid nanocomposite coatings containing different amounts of nanozirconia were prepared on a 30-μm thick steel sheet for the subsequent scratch test. The highest scratch resistance of 3950 g was associated with the coating containing 0.0015 g nanozirconia. The electrochemical properties of the composite coating were investigated using potentiodynamic polarization (TOEFL) and electrochemical impedance spectroscopy (EIS). The results showed that the corrosion resistance of the steel sheet coated with zirconia composite is much better than that without the coating. The ZrO2 composite coating also showed better corrosion inhibition and improving surface resistance against mechanically induced scratches, without any trade-off in transparency. Keywords Sol-gel process . SiO2 . TiO2 . ZnO . ZrO2 . Nanocomposite coatings . Anti-scratch
1 Introduction Due to different economic and environmental considerations, protection of metals and alloys against corrosion is of great importance in modern metal finishing industries [1]. The most valuable and successful methods for prevents corrosion and scratch process of metals is applying an external layer of polymeric coating onto a metal substrate. Polymeric coatings were widely used as a barrier layer between the corrosive ions and the metal surface to prevent corrosion [1, 2]. This method limited contact of metal surface with environment and corrosive functions, although these coatings must be
* Sahar Amiri [email protected] 1
Department of Polymer Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2
Department of Inorganic Pigments and Glazes, Institute for Color Science and Technology (ICST), PO Box 1668814811, Tehran, Iran
flexible, resistance against impact, chemical resistance to the environment, resistance to permeation of moisture, good adhesion and cohesion. Organic coatings are utilizing via different strategies, including physical vapor deposition (PVD), chemical vapor deposition (CVD), electrochemical deposition, plasma spraying, and sol-gel processes [3]. Sol-gel processing is an appropriate chemical method to combine inorganic and organic components as a high purity homogene
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