• Electrospun polystyrene fibres on TiO$_2$ nanostructured film to enhance the hydrophobicity and corrosion resistance of stainless steel substrates

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      https://www.ias.ac.in/article/fulltext/pram/086/03/0653-0660

    • Keywords

       

      Nanostructures; anticorrosion layers; hydrophobicity; contact angle.

    • Abstract

       

      A dual layer of dip-coated TiO$_2$ film (top layer) and electrospun polystyrene (bottom layer) was coated on stainless steel (SS) substrates. The morphological and structural studies were performed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Their hydrophobicity and corrosion resistance were also investigated using contact angle (CA) and electrochemical corrosion tests in acidic and salt solutions, respectively. Contact angle results showed that the naturally hydrophilic TiO$_2$/SS sample (CA ∼ 66$^\deg$) turned into a superhydrophic surface (CA ∼ 148$^\deg$) when it was covered by polystyrene fibres (PS/TiO2/SS). This observation can be attributed to the intrinsic hydrophobicity of organic polystyrene fibres (due to their low surface energy) and also to the existence of trapped air bubbles between fibres. Electrochemical corrosion tests showed that the corrosion rate was substantially decreased by using a protective bilayer (PS/TiO$_2$) from 33 to 0.39 mV/y for bare SS sample and from 0.01 to 0.003 mV/y for PS/TiO$_2$/SS sample in 1 M salt and acidic solutions, respectively. The superhydrophobic protective layer forms an obstacle against ionic exchange interactions. Therefore, it slows down the breaking of the surface oxidic layer on the metal substrate and prevents the metallic surface underneath from further corrosion.

    • Author Affiliations

       

      Azimirad R1 Safa S2

      1. Malek-Ashtar University of Technology, Tehran, Iran
      2. Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran
    • Dates

       
  • Pramana – Journal of Physics | News

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