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Enhanced Charge Transport and Corrosion Protection Properties of Polyaniline–Carbon Nanotube Composite Coatings on Mild Steel

  • T. Rajyalakshmi
  • Apsar PashaEmail author
  • Syed Khasim
  • Mohana Lakshmi
  • M. V. Murugendrappa
  • Nacer Badi
Article
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Abstract

We report on the synthesis and characterization of carbon nanotube (CNT)-doped polyaniline (PANI) composites for enhanced corrosion protection of steel with improved electrical properties. PANI–CNT nanocomposites were prepared through in situ polymerization of aniline in the presence of CNTs. Synthesized nanocomposites were characterized by several analytical methods such as Fourier transform infrared spectroscopy, x-ray diffraction, micro-Raman spectroscopy, and scanning electron microscopy in order to understand the structural, morphological, and molecular aspects of the composites. The doping of CNTs in PANI matrix drastically enhanced the alternating current/direct current (AC/DC) conductivities as well as the dielectric attributes and impedance spectroscopy of the composites. The anticorrosion studies of the prepared composites were performed by using open-circuit potential analysis and potentiodynamic measurements. Compared to stainless steel, PANI–CNT nanocomposites demonstrated excellent anticorrosion behavior. The obtained results showed that 25 wt.% of CNT-doped PANI composite exhibits excellent anticorrosion properties due to electron transmission and passive catalysis.

Keywords

Polyaniline carbon nanotubes PANI–CNTs anticorrosion nanocomposites electrical conductivity 
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Notes

Acknowledgments

The authors would like to thank the management and Principal of PES University, Bangalore South Campus, for their cooperation and assistance to carry out this research work.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • T. Rajyalakshmi
    • 1
  • Apsar Pasha
    • 2
    Email author
  • Syed Khasim
    • 3
    • 4
  • Mohana Lakshmi
    • 4
  • M. V. Murugendrappa
    • 5
  • Nacer Badi
    • 3
    • 6
  1. 1.Department of PhysicsPES UniversityBengaluruIndia
  2. 2.Department of PhysicsGhousia College of EngineeringRamanagaramIndia
  3. 3.Renewable Energy Laboratory, Nanotechnology Research Unit, Faculty of ScienceUniversity of TabukTabukKingdom of Saudi Arabia
  4. 4.Department of PhysicsPES UniversityBengaluruIndia
  5. 5.Center of Excellence in Advanced Materials ResearchBMS College of EngineeringBengaluruIndia
  6. 6.Center for Advanced MaterialsUniversity of HoustonHoustonUSA

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