Fig. 5: Electrochemical processes, interface characterization, and corrosion mechanisms in coated AA 7075 substrates. | npj Materials Degradation

Fig. 5: Electrochemical processes, interface characterization, and corrosion mechanisms in coated AA 7075 substrates.

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

Fig. 5

Post-exposure SEM cross-sectional views of coatings comprising (a) PEEK, (b) epoxy (2011) variation with no fillers, (c) PEI, and (d) 3 wt.% UFG/PEI, respectively with the scale bars measuring 50 µm distance, on AA 7075 substrates monitored across 100 days of exposure to 3.5 wt.% aqueous solutions of NaCl. Aluminum EDX maps of coatings comprising (e) PEEK, (f) epoxy, (g) PEI, and (h) 3 wt.% UFG/PEI. Bode plots corresponding to coatings comprising (i) PEEK, (j) epoxy, (k) PEI, and (l) 3 wt.% UFG/PEI. Nyquist plots for coatings comprising (m) PEEK, (n) epoxy variation, (o) PEI, and (p) 3 wt.% UFG/PEI monitored across 100 days of exposure to 3.5 wt.% aqueous solutions of NaCl.

Back to article page