Abstract
Silica-based coatings prepared using sol-gel polymerizing technology have been shown to exhibit excellent chemical stability combined with reducing the corrosion of metal substrates, showing promising use in aerospace and marine applications to protect light alloys. Moreover, this technology is an eco-friendly technique route for producing surface coatings, showing high potential for replacing toxic pre-treatment coatings of traditional conversation chromate coatings. This study aims to investigate the enhancement in corrosion protection of a hybrid-organic-inorganic silica-based coating cured at 80 °C by increasing the hydrophobicity to work on the aluminium 2024-T3 alloy. This approach involving a novel silica-based hybrid coating was prepared by introducing 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) into the base hybrid formula created from tetraethylorthosilicatesilane (TEOS) and triethoxymethylsilane (MTMS) precursors; this formula was enhanced by introducing a Polydimethylsiloxane polymer (PDMS). The corrosion protection properties of these coatings were examined by being immersed in 3.5% NaCl with electrochemical impedance testing (EIS) and Potentiodynamic polarization scanning (PDPS). The chemical elements confirmation was performed using infrared spectroscopy (ATR-FTIR); all this was supported by analysing the surface morphology before and after the immersion by using scanning electron microscopy (SEM). The results of the electrochemical impedance testing analyses reveal the new open finite-length diffusion circuit element due to electrolyte media diffusion prevented by fluorinated groups. Additionally, it shows increases in corrosion protection arising from the increasing hydrophobicity of the fluorinated coating compared to other formulas cured under similar conditions and bare substrate. Additionally, the modified sol-gel exhibited improved resistance to cracking, while the increased hydrophobicity may also promote self-cleaning.
Highlights
The hybrid silica-based derived coatings have already been identified as a potential solution for the aerospace and marine industry in terms of corrosion protection [1,2,3]
The results for SHX-80 and PF-SHX-80 are presented in Figure 2, along with the result of a test conducted on a bare 2024-T3 aluminium alloy for comparison
The results show that the coatings reduced the measured current when compared to the uncoated aluminium alloy and shifted the corrosion pocurrent when compared to the uncoated aluminium alloy and shifted the corrosion potential tential to more noble values
Summary
The hybrid silica-based derived coatings have already been identified as a potential solution for the aerospace and marine industry in terms of corrosion protection [1,2,3]. 2021, 7, 6 sol-gel process is an eco-friendly method of surface protection, which offers many options, including using single- or multi-layer coating systems with anti-corrosion and antifouling sol-gel process is an eco-friendly method of surface protection, which offers many options, systems [2,4,5,6]. Sol-gel coatings can present other desirable properties, such including using single- or multi-layer coating systems with anti-corrosion and antifouling as preventing ice accumulation, oxidation resistance and abrasion resistance [7,8,9]. Sol-gel coatings can present other desirable properties, such ertheless, long-term exposure tooxidation moistureresistance can negatively influence many coatings sysas preventing ice accumulation, and abrasion resistance [7,8,9].
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