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image of Effect of Polyaniline Content on the Photoelectric Properties and 
Corrosion Resistance of Titanium Dioxide/Polyaniline/Epoxy Composite Coatings

Abstract

Introduction

Anticorrosion coatings (which are easy to apply) can be used to form a protective barrier on metallic surfaces. They physically or chemically impede corrosive reactions and reduce corrosion rates, making them commonly used in the field of metal corrosion prevention.

Methods

TiO/PANI composite coating nanoparticles with photoelectric conversion function were synthesized by oxidation polymerization and used as functional fillers in EP resin to prepare an anti-corrosion coating. A series of TiO/PANI/EP composite coatings were applied on the surface of Q235 carbon steel, and their photoelectric properties and corrosion resistance were studied using an electrochemical workstation.

Results

Under continuous illumination, the photocurrent stabilized at a relatively steady positive value. When the TiO: PANI ratio was 3:1, the protection of Q235 carbon steel was optimal, achieving the highestcorrosion protection efficiency of 96.20%. The maximum self-corrosion potential was -0.149V, and the minimum self-corrosion current density was 1.768 × 10-6 A/cm2, demonstrating excellent corrosion resistance.

Discussion

Under dark conditions, TiO/PANI/EP coating can effectively prevent the corrosive medium from invading the carbon steel substrate through the synergistic physical shielding of EP resin and the metal passivation effect of PANI. Under light conditions, nanoparticles in TiO/PANI/EP composite coating absorb light energy to produce photogenerated electrons, thereby enhancing the protection of Q235 carbon steel.

Conclusion

TiO/PANI/EP composite coating nanoparticles can enhance the photoelectric performance and corrosion resistance of the polar ion coating on the surface of Q235 carbon steel.

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2025-03-17
2025-11-08

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/content/journals/cms/10.2174/0126661454359469250306070939
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Effect of Polyaniline Content on the Photoelectric Properties and 
Corrosion Resistance of Titanium Dioxide/Polyaniline/Epoxy Composite Coatings
Bentham Science Publishers ; https://doi.org/10.2174/0126661454359469250306070939
/content/journals/cms/10.2174/0126661454359469250306070939
/content/journals/cms/10.2174/0126661454359469250306070939
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  • Article Type:     Research Article
Keywords: TiO2/PANI composite materials ; epoxy resin coating ; Photocathodic protection ; corrosion protection ; in-situ oxidation polymerization ; photocatalysis

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