LAUSR

Abstract Effect of surface roughness on the inhibition behavior of X70 steel corrosion in CO2-saturated brine by a thioureido imidozaline inhibitor was investigated. Results showed that samples with different surface roughness had the same corrosion rate/corrosion current density in the absence of inhibitor. However, the inhibition efficiencies for samples with different surface roughness were distinct in the presence of inhibitor, and smoother samples exhibited higher inhibition efficiencies. Smoother surface with a higher electron work function was more attractive to react with the inhibitor molecules and then formed a more protective inhibitor film, compared to rougher surface.