Fig. 6: Electrochemical processes, interface characterization, and corrosion mechanisms upon exposure to salt water at elevated temperature. | npj Materials Degradation

Fig. 6: Electrochemical processes, interface characterization, and corrosion mechanisms upon exposure to salt water at elevated temperature.

From: Mechanistic origins of corrosion protection of aluminum alloys by graphene/polyetherimide nanocomposite coatings

Fig. 6

Post-exposure SEM cross-sectional views of coatings, with scale bars equal to 50 µm, comprising (a) PEEK, (b) epoxy (2011) variation with no fillers, (c) PEI, and (d) 3 wt.% UFG/PEI, respectively, coated onto AA 7075 substrates after exposure for 14 days to a 3.5 wt.% aqueous solution of NaCl at 70 °C. Aluminum EDX maps of substrates coated with (e) PEEK, (f) epoxy, (g) PEI, and (h) 3 wt.% UFG/PEI. Bode plots monitored over 14 days of exposure corresponding to coatings comprising (i) PEEK, (j) epoxy, (k) PEI, and (l) 3 wt.% UFG/PEI. Nyquist plots for (m) PEEK, (n) epoxy variation, (o) PEI, and (p) 3 wt.% UFG/PEI.

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