High protective performance coatings for mild steel

High protective performance coatings were prepared by dispersing polyaniline (PANI) nanowires into epoxy modified furfural-acetone (EMFA) resin matrix and then cured with phenalkamine.

Steel grids stacked on top of each other.
High performance EMFA/PANI coating was prepared by adding PANI nanowires into EMFA resin and then cured with phenalkamine. Source: congerdesign / Pixabay. -

The protective performance of coatings was investigated by immersion experiments in 12% NaCl solution at 90 °C and Electrochemical Impedance Spectroscopy (EIS) measurements.

The coating containing 1.0% PANI nanowires showed high impedance (>1010 ohm·cm2) after 80 days immersion, exhibiting great protective performance.

Excellent flexibility of pure EMFA coating and EMFA/PANI coating

X-ray photoelectron spectroscopy (XPS) surveys verified the formation of passive layer (Fe2O3/Fe3O4) on steel surface beneath the coating with 1.0% PANI. The bending test suggested that both the pure EMFA coating and the EMFA/PANI coating showed excellent flexibility of 2 mm.

Here, measurement of water absorption, adhesion strength, pencil hardness and impact resistance were conducted to evaluate coatings performance.

The study is published in: Progress in Organic Coatings Volume 134, September 2019, Pages 48-57.

Image Source: Pixabay

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