Fig. 3: Electrochemical processes, interface characterization, and corrosion mechanisms in coated AA 7075 substrates upon salt-fog exposure. | npj Materials Degradation

Fig. 3: Electrochemical processes, interface characterization, and corrosion mechanisms in coated AA 7075 substrates upon salt-fog exposure.

From: Mechanistic elucidation of the molecular weight dependence of corrosion inhibition afforded by polyetherimide coatings

Fig. 3

Cross-sectional SEM images of AA 7075 substrates coated with (a) MW 60,000 PEI; (b) MW 50,000 PEI; and (c) MW 35,000 PEI. The scale-bars represent 50 µm. Aluminum EDS maps of AA 7075 substrates coated with (d) MW 60,000 PEI; (e) MW 50,000 PEI; and (f) MW 35,000 PEI. Bode plots corresponding to AA 7075 substrates coated with (g) MW 60,000 PEI; (h) MW 50,000 PEI; and (i) MW 35,000 PEI. Nyquist plots for AA 7075 substrates coated with (j) MW 60,000 PEI; (k) MW 50,000 PEI; and (l) MW 35,000 PEI. The impedance response has been monitored across 30 days of salt-fog exposure using 5 wt% aqueous solutions of NaCl.

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