Number and percent coverage of corrosion tubercles, and surface roughness measurements for steel coupons from different experimental treatments.

Mean values and standard deviations are shown (n = 3). Means followed by one or two asterisks were different from the silica gel coating control at the significance levels of p<0.05 or p<0.01, respectively. There were no differences in surface roughness (SRa) between any treatments (p’s>0.05).