Corrosion protection of carbon steel by silica-based hybrid coatings containing cerium salts: Effect of silica nanoparticle content

SURFACE & COATINGS TECHNOLOGY

卷:265

Article

Santana, Ianina¹  Pepe, Andres¹  Jimenez-Pique, Emilio³  Pellice, Sergio¹  Milosev, Ingrid²  Cere, Silvia¹ 

[1] Univ Nacl Mar del Plata, CONICET, INTEMA, Mar Del Plata, Buenos Aires, Argentina

[2] Jozef Stefan Inst, Dept Phys & Organ Chem, SI-1000 Ljubljana, Slovenia

[3] Univ Politecn Cataluna, Dept Ciencia Dels Mat & Engn Met, E-08028 Barcelona, Spain

关键词: Carbon steel;    Hybrid coating;    Silica nanoparticles;    Cerium;    Corrosion;   

DOI  :  10.1016/j.surfcoat.2015.01.050

来源: Elsevier

【 摘 要 】

One strategy for minimising corrosive attack on carbon steel involves the application of hybrid coatings rich in rare earths, on the basis of their low toxicity and environmental sustainability. Tetraethoxysilane (TEOS) and 3-glycidoxypropyl-trimethoxysilane (GPTMS) were each used here as precursors, together with various quantities of colloidal silica suspension, to improve barrier properties of the coatings. Ce(NO3)(3)center dot 6H(2)O was added as a source of Ce(III) for further inhibition of corrosion. The corrosion resistance of each kind of sample was evaluated using potentiodynamic polarisation measurements and electrochemical impedance spectroscopy (EIS) in 0.35 wt.% NaCI solution. The electrochemical behaviour at various immersion times was modelled by equivalent circuits to demonstrate the effect of silica nanoparticle loading on corrosion. Additional testing was performed under harsh conditions of salt spray chamber. The microstructure and composition of sol-gel coatings were characterised by scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDS), focused-ion beam SEM/EDS analysis, X-ray photoelectron spectroscopy and confocal microscopy. (C) 2015 Elsevier B.V. All rights reserved.

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