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Vanadium Pentoxide-Enwrapped Polydiphenylamine/Polyurethane Nanocomposite: High-Performance Anticorrosive Coating
Halima Khatoon1, Sharif Ahmad1
1Materials Research Laboratory, Department of Chemistry , Jamia Millia Islamia (A Central University) , New Delhi 110025 , India.
ACS Applied Materials & Interfaces
|December 19, 2018
Summary
New nanocomposite coatings using safflower oil polyurethane and vanadium pentoxide-enwrapped polydiphenylamine offer superior, long-term corrosion protection for carbon steel. These advanced materials show exceptional performance in harsh environments.
Area of Science:
- Materials Science
- Corrosion Science
- Electrochemistry
Background:
- Nanocomposite coatings offer synergistic properties for enhanced corrosion protection.
- Polydiphenylamine (PDPA) and vanadium pentoxide (V2O5) are rarely explored as corrosion inhibitors.
- Oleo polyurethanes are highly sought after for anticorrosive coating applications.
Purpose of the Study:
- To synthesize and characterize novel nanocomposite coatings based on safflower oil polyurethane (SFPU) and V2O5-enwrapped PDPA (V2O5-PDPA).
- To evaluate the corrosion resistance performance of these nanocomposite coatings on carbon steel in corrosive media.
- To explore the potential of these materials as high-performance anticorrosive coatings.
Main Methods:
- Synthesis of SFPU and V2O5-PDPA nanocomposites.
- Characterization using Fourier-transform infrared spectroscopy, X-ray diffraction, nuclear magnetic resonance, electron microscopy (SEM, TEM), and thermogravimetric analysis.
- Electrochemical measurements (corrosion potential, current density, impedance) and salt spray tests in 5 wt% NaCl solution.
- Immersion tests in 1 M H2SO4 to assess resistance to oxidizing acids.
Main Results:
- Characterization confirmed the successful synthesis and structural properties of the nanocomposites.
- Electrochemical tests in 5 wt% NaCl showed excellent corrosion resistance: low Icorr (7.45 × 10^-11 A cm^-2), high Ecorr (-0.04 V), high impedance (1.69 × 10^11 Ω cm^2), and high phase angle (84°) after 30 days.
- Nanocomposite coatings demonstrated superior performance compared to plain SFPU and other reported systems, even after exposure to 1 M H2SO4.
Conclusions:
- The developed SFPU/V2O5-PDPA nanocomposite coatings exhibit outstanding anticorrosive properties for carbon steel.
- The synergistic effect between SFPU and V2O5-PDPA contributes to superior long-term corrosion protection.
- These findings open new avenues for developing advanced, high-performance anticorrosive coatings for industrial applications.
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