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J. Braz. Chem. Soc. vol.23 número3

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Figure 1. First scans of cyclic voltammograms of aluminium polarized in 0.1 mol L -1 H 3 PO 4 (- - -) and in {0.1 mol L -1 H 3 PO 4 + 0.5 mol L -1 Py}
Figure 4 shows the open circuit potential against time for four samples of aluminium coated with PPy in 3% NaCl aqueous medium: PPy-coated Al with a thickness of 14, 28, 43 and 57 µm, signed as PPy 14µm , PPy 28µm , PPy 43µm and PPy 57µm /Al, respect
Figure 5. Scheme of the proposed protective mechanism of PPy coating on aluminium in 3% NaCl solution.
Table 3. Evolution of the Al 3+ concentration in solution with the applied current density between 0.1 and 10 mA cm -2 during 5 min in 3% NaCl solution
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