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

Figure 3

SEM micrographs of salt-spray-exposed samples: (a) neat WPUD, (b) WPUD + 0.1% nanoalumina, and (c) WPUD + 1.0% nanoalumina.

(a)

(b)

(c)