Fig. 2: Electrochemical processes, interface characterization, and corrosion mechanisms in PEI-coated AA 7075 substrates. | npj Materials Degradation

Fig. 2: Electrochemical processes, interface characterization, and corrosion mechanisms in PEI-coated AA 7075 substrates.

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

Fig. 2

Post-exposure SEM cross-sectional view of (a) MW 60,000 PEI; (b) MW 50,000 PEI and (c) MW 35,000 PEI on AA 7075 substrates after 150 days of exposure to 3.5 wt% aqueous solutions of NaCl. The scale-bars correspond to 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 (j) MW 60,000 PEI; (k) MW 50,000 PEI; and (l) MW 35,000 PEI monitored across 150 days of exposure to 3.5 wt% aqueous solutions of NaCl.

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