Effect of Nanoalumina on the Electrochemical and Mechanical Properties of Waterborne Polyurethane Composite Coatings

Figure 6

AFM topographic height images of humidity-exposed coating surface at a scan size of 10 𝜇m × 10 𝜇m: (a) neat WPUD, (b) WPUD + 0.1% nanoalumina, and (c) WPUD + 1.0% nanoalumina.

(a)

(b)

(c)