Effects of Rolling Process on the Corrosion Resistance of Hot Rolled Plate Surface

摘要

The corrosion performance of A class ship plate steel with different rolling process were uaieo. by eiecirocnemicai measurements and. corrosion simulation unoer consieni temperature numidty. Scanning Electron Microscopy(SEM)and X-ray Diffraction methodology(XRD)were also employeed, and temperature increasing and linai cooling temperature decreasing, and the surface with little delect and a inhibite the breaken off of the oxide scales. The oxide scales were composed of Fe3O4, Fe2O3 and FeO. The colour of the plate surface turned to black and the proportion of FejO, increased with the finish the effects of rolling process on corrosion behaviors 01 hot rolled plate surface were discussed. A good compact structure was received as well. The results of electrochemical experiments showed the more positive free corrosion potential and lower corrosion current on the plate surface which were induced by the rolling process with higher finish temperature and lower final cooling temperature. The constent temperature humidity experiment showed that this kind of oxide scales could provide a strong inhibition effect on the ion dillusion and the ship plate under this kind of rolling process had a good resistance against umiorm corrosion and pitting corrosion than that under other rolling process.