Issue 29, 2014

Physico-mechanical and electrochemical corrosion behavior of soy alkyd/Fe3O4 nanocomposite coatings

Abstract

The present article reports the synthesis of butylated melamine formaldehyde (BMF) cured soy alkyd (SA-BMF) and nanoferrite (Fe3O4) dispersed SA-BMF (SA-BMF–Fe3O4) nanocomposite anticorrosive coatings. The structural elucidation of SA-BMF and SA-BMF–Fe3O4 was performed by Fourier transform infra-red (FT-IR) spectroscopy. Physico-mechanical properties such as impact resistance, bend test, scratch hardness, cross hatch adhesion test of these coatings were analyzed by standard protocols. Thermogravimetric analysis (TGA) was used to evaluate the thermal stability of the coating material. The corrosion resistance performance of SA-BMF and SA-BMF–Fe3O4 coated CS was evaluated by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques in 3.5 wt% NaCl solution. The salt spray test for coated and uncoated carbon steel (CS) strips in 5 wt% NaCl solution was also performed. Study revealed that the presence of Fe3O4 nanoparticles played a prominent role in the performance of SA-BMF matrix as reflected by high thermal stability, good hydrophobicity, enhanced physico-mechanical properties and higher corrosion resistance performance. Among different compositions, SA-BMF–Fe3O4-2.5 coatings exhibited far superior physico-mechanical and corrosion inhibition properties than SA-BMF coatings and other similar reported systems. The possible mechanisms of corrosion inhibition by nanocomposite coatings are also discussed.

Graphical abstract: Physico-mechanical and electrochemical corrosion behavior of soy alkyd/Fe3O4 nanocomposite coatings

Article information

Article type
Paper
Submitted
31 Dec 2013
Accepted
27 Jan 2014
First published
28 Jan 2014

RSC Adv., 2014,4, 14936-14947

Author version available

Physico-mechanical and electrochemical corrosion behavior of soy alkyd/Fe3O4 nanocomposite coatings

O. U. Rahman and S. Ahmad, RSC Adv., 2014, 4, 14936 DOI: 10.1039/C3RA48068B

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