Influence of Surface Roughness on the Corrosion Behaviors of DP590 Steel

Abstract

The influence of surface topography on the corrosion behaviors of DP590 steel was studied by damp heat tests and electrochemical measurements in this paper. Results show that the corrosion behaviors of DP590 steel cannot be evaluated by using average surface roughness (Sa) due to the little difference of surface roughness. Reduced valley depth (Svk) showed a good correlation with corrosion resistance in the potentialdynamic polarization test, and the greater Svk, the better the corrosion resistance. Furthermore, DP590 sample with higher proportion of peak on the surface tended to have more corrosion points during the damp heat test since peaks were electrochemically active.