Effects of grain size on corrosion resistance of Cu-P-Cr-Ni-Mo-Nb weathering steel

Three Cu-P-Cr-Ni-Mo-Nb weathering steel samples of different grain sizes,which were of 11.9 μm,9.2 μm and 6.8 μm respectively,were prepared using Gleeble-1500D thermo-simulator system.The accelerating corrosion experiments of the bare weathering steel were carried out for 72 hours through the FI-65 dry wet cycle infiltrating corrosion tester.The rust layer and matrix of the trial steel had good combinability.The corrosion weight-loss method was exploited to obtain the corrosion mass,and the corrosion rate and depth were calculated.The results showed that the grain size does not significantly affect the atmosphere corrosion resistance.