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<p>To enhance the corrosion resistance of 304 stainless steel in a chloride ion environment, titanium dioxide (TiO<sub>2</sub>) coatings doped with polytetrafluoroethylene (PTFE) were deposited on its surface using the sol–gel method. The surface morphology and microstructure were characterized using a scanning electron microscope (SEM), X-ray energy spectrometer (EDS), and Fourier-transform infrared spectrometer (FTIR). The hydrophobicity of the coatings was measured using a contact angle goniometer, and their corrosion resistance was tested using an electrochemical workstation. The results show that the prepared coatings are complete and dense, and their surface roughness increases after doping with an appropriate amount of PTFE. With an increase in the doping concentration of PTFE, the surface water contact angle increases from 48° for the substrate to 123°, exhibiting hydrophobicity. The titanium dioxide coating doped with 11.5&#xa0;vol% PTFE exhibits the best corrosion resistance, with a corrosion current density of 0.02&#xa0;μA/cm<sup>2</sup>, which is two orders of magnitude lower than that of the substrate. In addition, the coating doped with 11.5&#xa0;vol% PTFE has the largest capacitive arc radius and the best hydrophobicity.</p>

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Study on corrosion resistance of titanium dioxide coating doped with PTFE on stainless steel surface

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Xin Zhang,
  • Huihui Jiang,
  • Feilong Wang,
  • Yongjiang Wang,
  • Jiangang Wang

摘要

To enhance the corrosion resistance of 304 stainless steel in a chloride ion environment, titanium dioxide (TiO2) coatings doped with polytetrafluoroethylene (PTFE) were deposited on its surface using the sol–gel method. The surface morphology and microstructure were characterized using a scanning electron microscope (SEM), X-ray energy spectrometer (EDS), and Fourier-transform infrared spectrometer (FTIR). The hydrophobicity of the coatings was measured using a contact angle goniometer, and their corrosion resistance was tested using an electrochemical workstation. The results show that the prepared coatings are complete and dense, and their surface roughness increases after doping with an appropriate amount of PTFE. With an increase in the doping concentration of PTFE, the surface water contact angle increases from 48° for the substrate to 123°, exhibiting hydrophobicity. The titanium dioxide coating doped with 11.5 vol% PTFE exhibits the best corrosion resistance, with a corrosion current density of 0.02 μA/cm2, which is two orders of magnitude lower than that of the substrate. In addition, the coating doped with 11.5 vol% PTFE has the largest capacitive arc radius and the best hydrophobicity.