Advantage of Super-hydrophobic Surface as a Barrier against Atmospheric Corrosion Induced by Salt Deliquescence

摘要

This study demonstrates the advantage of using super-hydrophobic surface as a barrier against atmospheric corrosion induced by salt deliquescence. Different from the behaviour on hydrophilic and hydrophobic surfaces, deliquesced NaCl particle slips off super-hydrophobic surface inclined at an angle of ～20°, thereby preventing corrosion of underlying substrate by deliquesced salt. The observed slipping behaviour could be attributed to lubrication action of saline solution between deliquesced NaCl particle and super-hydrophobic film, as well as weak attraction between saline solution and substrate. Electrochemical measurements prove that the existence of air film contributes to the enhancement of barrier performance of super-hydrophobic film.