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Friday, 22 November 2019
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Raw materials & technologies, Technologies

Effect of tetraaniline nanofiber on the anticorrosion performance of waterborne epoxy coating

Wednesday, 19 June 2019

A recent study discusses the addition of tetraaniline based conducting nanofiber (TANF) on the anticorrosive properties of waterborne epoxy coatings on Q235 mild steel.

Waterborne epoxy coating containing 0.5 wt% TANF exhibited improved corrosion resistance (symbol image). Image source: Fotoschlick – stock.adobe.com.

Waterborne epoxy coating containing 0.5 wt% TANF exhibited improved corrosion resistance (symbol image). Image source: Fotoschlick – stock.adobe.com.

TANF was synthesised by self-assembly of tetraaniline in 1 M HCl solution. The structure of TANF was characterised by the Fourier-transform infrared (FT-IR), Raman, X-ray diffraction (XRD) pattern, UV–vis spectra and photoelectron spectroscopy (XPS), and the morphology of TANF was used to investigate by scanning electron microscope (SEM) and scanning probe microscope (SPM).

The self-assembled TANF possesses excellent solubility, tiny nanofibrous structure and reversible redox behavior, making it appropriate as a novel anticorrosive pigment for the waterborne coatings. Electrochemical impedance spectroscopic (EIS), polarising curves and scanning vibrating electrode technique (SVET) were used to investigated the effect of TANF on the anticorrosion performance of epoxy coating.

Improved corrosion resistance properties

The results revealed that the waterborne epoxy coating containing 0.5 wt% TANF exhibited improved corrosion resistance properties compared to pure waterborne epoxy coating. The addition of electroactive TANI could facilitate to form a passive metal oxide layer beneath the coating as proved by characterization of rust layers by X-ray diffraction (XRD).

The study has been published in Progress in Organic Coatings, Volume 128.

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