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<p>Corrosion protection of metal surfaces demands durable, efficient, and environmentally friendly solutions. This study presents the synthesis and evaluation of a novel conductive polymer composite, poly(o-anisidine)/cinnamaldehyde/silicon dioxide (POA/CIN/SiO<sub>2</sub>), in comparison to its formaldehyde-based counterpart (POA/FA/SiO<sub>2</sub>). The composite was synthesized via an in situ schiff base&#xa0;reaction and characterized using FTIR, SEM, EDX, and XRD. Mechanical properties, including hardness, scratch and impact resistance, along with chemical stability, hydrophobicity, and corrosion resistance, were assessed. The POA/CIN/SiO<sub>2</sub> (5 wt%) formulation demonstrated the best overall performance, achieving high pencil hardness (6H), excellent scratch (2.8&#xa0;kg) and impact resistance (74.8&#xa0;kg-cm), superior chemical resistance in acid, alkali, and solvents, and the highest contact angle (74.64°), indicating hydrophobicity. Salt spray tests showed minimal corrosion, while electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization revealed significantly improved barrier properties and reduced corrosion rates. The synergistic effect of POA’s redox activity, CIN’s eco-friendly inhibition via imine crosslinking, and SiO<sub>2</sub>’s barrier reinforcement makes this composite a promising candidate for sustainable and high-performance corrosion protection.</p> Graphical abstract <p></p>

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Development of POA/formaldehyde/SiO2 and POA/cinnamaldehyde/SiO2 composite-based epoxy anticorrosion coatings

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Aakanksha Mukesh Mhatre,
  • Aarti P. More

摘要

Corrosion protection of metal surfaces demands durable, efficient, and environmentally friendly solutions. This study presents the synthesis and evaluation of a novel conductive polymer composite, poly(o-anisidine)/cinnamaldehyde/silicon dioxide (POA/CIN/SiO2), in comparison to its formaldehyde-based counterpart (POA/FA/SiO2). The composite was synthesized via an in situ schiff base reaction and characterized using FTIR, SEM, EDX, and XRD. Mechanical properties, including hardness, scratch and impact resistance, along with chemical stability, hydrophobicity, and corrosion resistance, were assessed. The POA/CIN/SiO2 (5 wt%) formulation demonstrated the best overall performance, achieving high pencil hardness (6H), excellent scratch (2.8 kg) and impact resistance (74.8 kg-cm), superior chemical resistance in acid, alkali, and solvents, and the highest contact angle (74.64°), indicating hydrophobicity. Salt spray tests showed minimal corrosion, while electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization revealed significantly improved barrier properties and reduced corrosion rates. The synergistic effect of POA’s redox activity, CIN’s eco-friendly inhibition via imine crosslinking, and SiO2’s barrier reinforcement makes this composite a promising candidate for sustainable and high-performance corrosion protection.

Graphical abstract