Erosion-Corrosion Behavior of Aluminum Bronze under Different Flow Velocities of Seawater Slurry

The erosion corrosion behaviors of an aluminum bronze in static seawater, 2 m/s and 4 m/s seawater slurry were studied through scanning electron microscopy, electrochemical impedance spectroscopy and electrochemical noise and corrosion tests. The results showed that in static seawater, the surface of aluminum bronze was mainly pitting in the early stage of corrosion, and the accumulation of corrosion products on the surface of aluminum bronze in the later stage made it difficult for corrosive particles to transport, and the electrochemical corrosion rate gradually decreased. Under 2 m/s seawater erosion, the surface pitting of aluminum bronze was serious, corrosion was mainly controlled by diffusion, and the corrosion rate increased due to the shedding of corrosion products. Under 4 m/s seawater erosion, the surface of aluminum bronze was mainly pitting in the initial stage of corrosion, and the energy of nucleation zone increased at the later stage of corrosion due to diffusion, and the corrosion rate of aluminum bronze firstly decreased and then remained stable.