Hybrid epoxy-silane coatings for improved corrosion protection of Mg alloy

abstract

New hybrid epoxy-silane coatings, with added functionalities for improved performance and durability, were designed to increase the corrosion protection of magnesium alloys. The corrosion behavior of the coated AZ31 was studied through electrochemical impedance spectroscopy (EIS) in 0.05 M NaCl. The morphology and surface chemistry of the samples were also investigated through scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR) before and after immersion in the electrolyte. The new hybrid silane coatings showed a high resistance to corrosion that persisted throughout one-month immersion in a pH-neutral NaCl solution. (c) 2012 Elsevier Ltd. All rights reserved.

keywords

2024-T3 ALUMINUM-ALLOY; AZ91D MAGNESIUM ALLOY; SOL-GEL COATINGS; SILICA HYBRIDS; SURFACE MODIFICATION; ORMOSIL COATINGS; AZ31; RESISTANCE; INHIBITORS; BEHAVIOR

subject category

Materials Science; Metallurgy & Metallurgical Engineering

authors

Brusciotti, F; Snihirova, DV; Xue, HB; Montemor, MF; Lamaka, SV; Ferreira, MGS

our authors

acknowledgements

The authors would like to acknowledge Prof. Luis Santos from Instituto Superior Tecnico for his help with FTIR measurement and the Portuguese Foundation for Science and Technology (FCT), projects PTDC/CTM-MET/112831/2009, PTDC/ECM/69132/2006 and D.V. Snihirova's PhD grant SFRH/BD/72497/2010.

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