Corrosion protection with nanoscale anticorrosive pigments in coatings

For the efficient corrosion protection of metals with primers, the release and transport of active species to the metal surface is of great importance. In the present study, nanoscale corrosion protective phosphate derivates, obtained by a top-down approach were compared with their conventional microscale counterparts to determine the influence of particle size on the working mechanism and efficiency of the corrosion protection of steel substrates. Using SEM images of cross sections of the primer layers, the pigment particle distribution was visualized and it could be evidenced that the finer particles were able to more closely approach the metal surface. A short time test, combined with electrochemical measurements and outdoor weathering experiments confirmed . that the nanoscale corrosion protection pigments are of advantage producing efficient corrosion protection of metals.