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

Table 1

AFM Surface roughness values (nm) measured for coatings exposed to salt spray, humidity, and UV weathering.

Test	Neat WPUD	WPUD + 0.1% Nanoalumina	WPUD + 1.0% Nanoalumina
Salt spray	128.66 nm	18.64 nm	47.72 nm
Humidity	132.71 nm	6.79 nm	17.93 nm
UV weathering	20.54 nm	10.70 nm	13.94 nm