Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Investigation of Polypyrrole Coatings Containing Nanosized Metal Oxides for Corrosion Protection of AA2024 Al Alloy

  • Fekri, F. (Department of Chemistry, Kerman Branch, Islamic Azad University) ;
  • Shahidi, M. (Department of Chemistry, Kerman Branch, Islamic Azad University) ;
  • Foroughi, M.M. (Department of Chemistry, Kerman Branch, Islamic Azad University) ;
  • Kazemipour, M. (Department of Chemistry, Kerman Branch, Islamic Azad University)
  • Received : 2018.07.22
  • Accepted : 2018.10.29
  • Published : 2019.06.30
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Abstract

The corrosion protection of AA2024 PPy coated samples doping with nanosized metal oxides, including $TiO_2$ and $CeO_2$ nanoparticles and $Nd_2O_3$ nanorods, during exposure to the solutions of 0.1 M $H_2SO_4$ and 3.5% NaCl was evaluated by electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques. The nanorods of $Nd_2O_3$ were synthesized by cathodic pulse electrochemical deposition technique. The barrier properties of the different PPy coatings containing nanosized metal oxides immersed in $H_2SO_4$ solution were ranked as follows: $Nd_2O_3$ > $TiO_2$ > $CeO_2$. Therefore, the $Nd_2O_3$ coating sample provided the highest corrosion protection at any time of immersion up to 72 hours after immersing in $H_2SO_4$ solution. On the other hand, the $CeO_2$ coating sample displayed the best anticorrosive properties among the other coating samples after immersion in NaCl solution up to 28 days. This is due to the inhibition effect of cerium ions on aluminum alloys at near-neutral solutions.

Keywords

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Fig. 1. Schematic representation of diffusion into the coating: (a) coating without filler; (b) coating with nanoparticle filler [24].

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Fig. 2. FESEM image of Nd2O3 nanorods.

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Fig. 3. X-ray diffraction patterns of Nd2O3 nanorods.

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Fig. 4. Nyquist plots of the PPy coated AA2024 Al alloy without (blank) and with various nanosized metal oxides recorded at (a) 5 h, (b) 24 h and (c) 72 h after immersion in 0.1 M H2SO4 solution.

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Fig. 5. Equivalent circuit.

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Fig. 6. The plots of Rct obtained from EIS measurements for different coating samples after immersion in 0.1 M H2SO4 solution as a function of exposure time.

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Fig. 7. Linear Polarization plots of the PPy coated AA2024 Al alloy without (blank) and with different nanosized metal oxides recorded at (a) 5 h, (b) 24 h and (c) 72 h after immersion in 0.1 M H2SO4 solution.

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Fig. 8. The plots of Rp obtained from LPR measurements for different coating samples after immersion in 0.1 M H2SO4 solution as a function of exposure time.

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Fig. 9. Nyquist plots of the PPy coated AA2024 Al alloy without (blank) and with various nanosized metal oxides recorded at (a) 1 d, (b) 18 d and (c) 28 d after immersion in 3.5% NaCl solution.

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Fig. 10. The plots of Rct obtained from EIS measurements for different coating samples after immersion in 3.5% NaCl solution as a function of exposure time.

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Fig. 11. Linear Polarization plots of the PPy coated AA2024 Al alloy without (blank) and with different nanosized metal oxides recorded at (a) 1 d, (b) 18 d and (c) 28 d after immersion in 3.5% NaCl solution.

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Fig. 12. The plots of Rp obtained from LPR measurements for different coating samples after immersion in 3.5% NaCl solution as a function of exposure time.

Table 1. The calculated thickness of different PPy films synthesized at scan rate of 100 mV/s and 25 cycle numbers.

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Table 2. Impedance parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 0.1 M H2SO4 solution.

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Table 3. Linear polarization parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 0.1 M H2SO4 solution

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Table 4. Impedance parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 3.5% NaCl solution.

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Table 5. Linear polarization parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 3.5% NaCl solution.

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