On the basis of single-phase flowing model

two-phase liquid/solid flowing theory was introduced to study numerically the flow induced corrosion of carbon steel in 3.5% NaCl+5% sand. It was found that the mechanics parameters of particle-phase including impact angle

impact frequency

impact velocity strongly influenced the hydrodynamic and mass transfer parameters (surface shear stress

mass transfer coefficient)

which sharply increased erosion-corrosion rate of carbon steel within the limits of 0—18m8226;s-1 flow velocity. The results further showed that the numerical corrosion rates were almost equal to the measured rates. Thus it was verified that under flowing condition the electrochemical corrosion action still played an important role in corrosion synergism of carbon steel. With further increasing flowing velocity

wear rate was still small

but it could not be ignored.