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<p>Antifouling coatings play a crucial role in marine applications, and self-stratification is an advanced approach towards their development. This study presents the first-hand use of graphitic carbon nitride (GCN) in PDMS-epoxy self-stratifying coatings useful for both antifouling and anticorrosion applications. Exfoliated GCN nanosheets were synthesized via thermal polycondensation of urea and characterized using FTIR, XRD, DRUV, FESEM, and TEM, confirming a nanosheet structure (~1-1.5&#xa0;μm lateral size, ~ 10&#xa0;nm thickness) with a band gap of ~ 3&#xa0;eV. The GCN-incorporated self-stratifying coatings exhibited enhanced mechanical properties and a hydrophobic surface. The antifouling property was optimal in the presence of 0.4 wt% GCN nanofiller as evidenced by the pseudo-barnacle test (under a shear force of 29.45 N) and supported by contact angle measurements. Electrochemical impedance spectroscopy (EIS) revealed that the GCN0.4 coating exhibited the highest charge transfer resistance (Rct = 1.05 × 10<sup>11</sup>&#xa0;Ω) and lowest CPE-derived capacitance (5.50 × 10<sup>−11</sup> Ω<sup>−1</sup>.s<sup>n</sup>), indicating enhanced barrier properties against corrosion in saline environments. Overall, these findings highlight the effectiveness of GCN nanosheets in significantly improving the antifouling and anticorrosion performance of next-generation marine protective coatings.</p>

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Exploring the role of graphitic carbon nitride to enhance antifouling and anticorrosion properties of self-stratifying coatings

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Prasad R. Deshpande,
  • R. Baloji Naik,
  • Geeta K. Sharma,
  • Anjali A. Athawale

摘要

Antifouling coatings play a crucial role in marine applications, and self-stratification is an advanced approach towards their development. This study presents the first-hand use of graphitic carbon nitride (GCN) in PDMS-epoxy self-stratifying coatings useful for both antifouling and anticorrosion applications. Exfoliated GCN nanosheets were synthesized via thermal polycondensation of urea and characterized using FTIR, XRD, DRUV, FESEM, and TEM, confirming a nanosheet structure (~1-1.5 μm lateral size, ~ 10 nm thickness) with a band gap of ~ 3 eV. The GCN-incorporated self-stratifying coatings exhibited enhanced mechanical properties and a hydrophobic surface. The antifouling property was optimal in the presence of 0.4 wt% GCN nanofiller as evidenced by the pseudo-barnacle test (under a shear force of 29.45 N) and supported by contact angle measurements. Electrochemical impedance spectroscopy (EIS) revealed that the GCN0.4 coating exhibited the highest charge transfer resistance (Rct = 1.05 × 1011 Ω) and lowest CPE-derived capacitance (5.50 × 10−11 Ω−1.sn), indicating enhanced barrier properties against corrosion in saline environments. Overall, these findings highlight the effectiveness of GCN nanosheets in significantly improving the antifouling and anticorrosion performance of next-generation marine protective coatings.