Abstract
In this study, the electrophoretic deposition of chitosan films doped with Nd2Ti2O7nanoparticles was carried out as corrosion protection systems for exposed materials in aqueous environments rich in chlorides. Completely crystalline Nd2Ti2O7nanoparticles with an average size of 100-200 nm were obtained. Electrophoretic deposition of chitosan films with Nd2Ti2O7nanoparticles was possible. With a working voltage of 5 V and 20 minutes of deposition, homogenous chitosan films with a thickness of 4 microns were obtained. According to the FT-IR (Fourier transform infrared spectroscopy), Raman, and XRD (X-ray diffraction) analyses, it was observed that the presence of the nanoparticles modified the properties of the chitosan films, that is, their crystallinity was increased and their moisture absorption capacity was reduced. These modifications caused a better performance against the corrosion of chitosan films deposited on 1018 carbon steel. Its electrochemical evaluation showed that the chitosan films perform as cathodic coatings by affecting the oxygen reduction reaction. This was possible due to the barrier effect of the Nd2Ti2O7nanoparticles, by blocking the effective area for the diffusion of the aggressive electrolyte species.
Highlights
It is known that the main objective of organic coatings as protective systems against corrosion is to prevent or mitigate the attack of the substrate by the aggressive anions present in the electrolyte [1, 2]
The electrophoretic deposition of chitosan films doped with Nd2Ti2O7 nanoparticles was carried out as corrosion protection systems for exposed materials in aqueous environments rich in chlorides
According to the FT-IR (Fourier transform infrared spectroscopy), Raman, and XRD (X-ray diffraction) analyses, it was observed that the presence of the nanoparticles modified the properties of the chitosan films, that is, their crystallinity was increased and their moisture absorption capacity was reduced
Summary
It is known that the main objective of organic coatings as protective systems against corrosion is to prevent or mitigate the attack of the substrate by the aggressive anions present in the electrolyte [1, 2]. Protective systems based on environmentally friendly coatings have found great interest in the scientific community. In this sense, due to its excellent properties such as biocompatibility, antimicrobial activity, biodegradability, and its ability to form stable films, chitosan emerges as an alternative for both the formulation and development of protective films that reduce the degradation of materials [4, 5]. Its applications are very diverse and range from medicine, articles for beauty (cosmetics), and the food industry among others
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