Abstract
Performance of the passive film on the surface of 304 SS at different vertical scouring heights were studied by electrochemical methods, Mott-Schottky and XPS analysis, and analysis of pit growth combined with 3-dimensional. During erosion-corrosion, the thickness of the passive film decreases, Fe3+ transforms to Fe2+, and the donor density and point diffusivity of the passive film increase. Meanwhile, it is also found that the depth of pits is increasing, and the rate of increase is higher than that of width. This is because the fluid has a greater force on the bottom of the pit than on the side.
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