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Wednesday, 22 May 2019
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Raw materials & technologies, Applications

Polyaniline-modified titanium dioxide composites in water-based epoxy coating

Wednesday, 20 February 2019

In a recently published study, researchers investigated  polyaniline-modified TiO2 composites in water-based epoxy coating for corrosion protection of Q235 steel.

The epoxy coating with TiO<custom name='sub'>2</custom>/PANI particles had a superior corrosion protection relative to the blank coating. Source: abet – stock.adobe.com.
The epoxy coating with TiO2/PANI particles had a superior corrosion protection relative to the blank coating. Source: a...

The development of active systems to protect metal substrates against corrosion is a promising approach for many industrial applications. In a new work, a self-healing coating based on TiO2 particles modified with polyaniline (PANI) was prepared for corrosion protection of Q235 steel. TiO2/PANI particles were synthesised by in situ polymerisation and dispersed into a water-based epoxy coating. The structure and morphology of as-prepared TiO2/PANI particles were characterised by FTIR, XRD, and SEM.

Improved corrosion protection properties with TiO2/PNAI particles

The anticorrosion performance of the coating was studied by electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM). EIS analysis showed improved corrosion protection properties in the presence of TiO2/PNAI particles. SECM measurements were performed to monitor the reduction of oxygen process as a function of exposure time in 3.5% NaCl solution. SECM results showed that the epoxy coating with TiO2/PANI particles had a superior corrosion protection relative to the blank coating after artificial defect exposure to the corrosive environment.

The study is published in: Journal of Coatings Technology and Research  January 2019, Volume 16, Issue 1, pp 71–80.

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