Electrochemical Behavior in Erosion- Corrosion of Carbon Steel in liquid-Solid Double Phase Flow Loop

The electrochemical behavior in erosion-corrosion of carbon steel in flowing liquid-solid double-phase solution was studied with self-made flow loop simulating apparatus.The experimental results showed that erosion-corrosion rate in flowing double-phase 3.5% NaCl solution containing 5% sand increases markedly with increasing flow velocity.But it was not found that the erosion-corrosion rate-decreased region which happened in flowing single phase solution existed.The erosion-corrosion process of carbon steel in flowing liquid-solid double-phase solution is still controlled by cathodic oxygen diffusion process.Once cathodic current was impressed on carbon steel,the erosion-corrosion rate of carbon steel decreases abruptly because the corrosion electrochemistry factor is restrained and the synergism is weakened.It was verified that corrosion electrochemical factor plays a dominant role in erosion-corrosion.