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<p>This study investigates the effects of epoxy (diglycidyl ether of bisphenol A-polyamide; DGEBA-PA) modification with a hybrid inhibitor, Titanium tetra-acetoximate [Ti(ON = C(CH<sub>3</sub>)<sub>2</sub>)<sub>4</sub>] (TTA), on titania (TiO<sub>2</sub>)-conversed mild steel (MS) surfaces and their adhesion and anti-corrosion performance. The DGEBA-PA-TTA coating over decorated MS shows superior adhesion strength, as evidenced by pull-off tests, i.e., 11.57&#xa0;MPa. The weight loss test observed increased corrosion inhibition efficiency (IE) of 90.47% and decreased corrosion rate (CR) of 1.55&#xa0;g/m<sup>2</sup>h after 720 hs. The electrochemical technique shows a significant decline in corrosion current density, i.e., 0.000607 μA/cm<sup>2</sup>, supporting their increased anticorrosive property. In-situ generation of organic (acetoxime), as well as inorganic (Ti–O linkages) inhibitors, was observed in epoxy frameworks using hybrid (TTA) inhibitors, as evidenced by Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The generation of Ti–O linkages in epoxy enhances its crosslinking capacity, reducing its porosity, supported by the Scanning electron microscope (SEM) images. The presence of acetoxime further enhances its anti-corrosion nature. The experiment’s contact angle results revealed that TiO<sub>2</sub>-decorated steel surface had higher surface free energy (68.58&#xa0;mJ/m<sup>2</sup>) and increased roughness than MS, making it more accessible for better coating adhesion. The experimental findings indicated that applying a TiO<sub>2</sub> nanofilm onto the steel surface resulted in an augmentation of its surface free energy and roughness, hence enhancing the adherence of the epoxy coating. It was also noted that the DGEBA-PA/DGEBA-PA-TTA adherence on the MS decorated with TiO<sub>2</sub> was stronger than on the non-decorated surface.</p>

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Enhancing Epoxy Adhesion and their Anti-Corrosion Performance on TiO2-Conversed Steel via Hybrid Inhibitor Modification

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Ishita Chopra,
  • Saraswati Kumari Ola,
  • Susruta Samanta,
  • Veena Dhayal

摘要

This study investigates the effects of epoxy (diglycidyl ether of bisphenol A-polyamide; DGEBA-PA) modification with a hybrid inhibitor, Titanium tetra-acetoximate [Ti(ON = C(CH3)2)4] (TTA), on titania (TiO2)-conversed mild steel (MS) surfaces and their adhesion and anti-corrosion performance. The DGEBA-PA-TTA coating over decorated MS shows superior adhesion strength, as evidenced by pull-off tests, i.e., 11.57 MPa. The weight loss test observed increased corrosion inhibition efficiency (IE) of 90.47% and decreased corrosion rate (CR) of 1.55 g/m2h after 720 hs. The electrochemical technique shows a significant decline in corrosion current density, i.e., 0.000607 μA/cm2, supporting their increased anticorrosive property. In-situ generation of organic (acetoxime), as well as inorganic (Ti–O linkages) inhibitors, was observed in epoxy frameworks using hybrid (TTA) inhibitors, as evidenced by Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The generation of Ti–O linkages in epoxy enhances its crosslinking capacity, reducing its porosity, supported by the Scanning electron microscope (SEM) images. The presence of acetoxime further enhances its anti-corrosion nature. The experiment’s contact angle results revealed that TiO2-decorated steel surface had higher surface free energy (68.58 mJ/m2) and increased roughness than MS, making it more accessible for better coating adhesion. The experimental findings indicated that applying a TiO2 nanofilm onto the steel surface resulted in an augmentation of its surface free energy and roughness, hence enhancing the adherence of the epoxy coating. It was also noted that the DGEBA-PA/DGEBA-PA-TTA adherence on the MS decorated with TiO2 was stronger than on the non-decorated surface.