Comparative study on the cavitation erosion behavior of two different rolling surfaces on 304 stainless steel

摘要

In this work, the cavitation erosion (CE) behavior of the rolling surface (RS) and the longitudinal section parallel to rolling direction (LSPTRD) for 304 stainless steel in 3.5 wt% NaCl solution was comparatively investigated by mass loss analysis, morphology observation, nanoindentation characterization, and electrochemical tests. Results indicated that the RS exhibited better CE resistance compared with the LSPTRD as a result of its higher hardness and elasticity thereby inhibiting the surface damage process. Meanwhile, the corrosion resistance of these two different rolling surfaces was compared, and the RS displayed a lower corrosion current density and a better repassivation performance under both CE and quiescence states. In addition, the morphology evolution and the protection capability of the passive films on different rolling surfaces were discussed.