Fig. 1. Schematic representation of diffusion into the coating: (a) coating without filler; (b) coating with nanoparticle filler [24].
Fig. 2. FESEM image of Nd2O3 nanorods.
Fig. 3. X-ray diffraction patterns of Nd2O3 nanorods.
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.
Fig. 5. Equivalent circuit.
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.
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.
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.
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.
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.
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.
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.
Table 2. Impedance parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 0.1 M H2SO4 solution.
Table 3. Linear polarization parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 0.1 M H2SO4 solution
Table 4. Impedance parameters of the PPy coated AA2024 Al alloy at different periods of immersion in 3.5% NaCl solution.
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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