EIS study of the epoxy paint in two different corrosive environments with a new filler: rice husk ash

EIS study of the epoxy paint in two different corrosive environments with a new filler: rice husk ash

In this paper, the corrosion behavior of the filled epoxy paint with the rice husk ash (RHA) on steel substrates in two different corrosive environments (natural sea water and 2M sulfuric acid) has been studied. The electrochemical impedance spectroscopy (EIS) was used to evaluate protective properties of different organic coating systems due to the different filler composition. By adding the RHA, as a new and natural filler, that was heated at 700 ˚C for 3 hours, to the epoxy paint, coatings resistance to penetration of the solution was increased in both environments. The best filler for the sea water environment was the white RHA (contained more silica) in 20% wt. due to increasing the corrosion resistance for 3 times with respect to the unfilled epoxy paint. The black rice husk ash (contained more carbon- group) increased the corrosion resistance of the epoxy paint in the sulfuric acid when added in 20% wt