Monodisperse Ag@SiO2 Core–Shell Nanoparticles as Active Inhibitors for Marine Anticorrosion Applications
Authors: Zhang, Xin-Sheng; Wang, Jie-Xin; Xu, Ke; Le, Yuan; Chen, Jian-Feng
Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 4, April 2011 , pp. 3481-3487(7)
Publisher: American Scientific Publishers
Abstract:Monodisperse Ag@SiO2 core–shell structured nanoparticles were firstly utilized as a novel corrosion inhibitor for marine anticorrosion applications. The related marine anticorrosion properties were evaluated with an electrochemical noise (ECN) analysis during 2 weeks of accelerated immersion tests in natural seawater with the addition of various inorganic salts and nutriments. The experimental results indicate that the corrosion activity is markedly reduced by nearly 1–3 orders of magnitude owing to the introduction of Ag@SiO2 core–shell nanoparticles into coating. The inhibition efficiency of corrosion can reach as high as about 99%. More importantly, such a coating exhibits an excellent long-term sustained marine anticorrosion effect. So it could be reasonably inferred that silver cores as active inhibitors effectively prevent the corrosion damage from microorganisms, while silica shells act as a good protection for silver nanoparticles, delay the release of silver ions, and also function as the corrosion inhibiting action for inorganic salts. Therefore, this would make monodisperse Ag@SiO2 core–shell nanoparticles a potential and promising corrosion inhibitor for developing future advanced multifunctional coatings.
Document Type: Research Article
Publication date: April 1, 2011
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