Combined experimental and simulation study on corrosion behavior of B10 copper–nickel alloy welded joint under local turbulence

The corrosion behavior of B10 copper–nickel alloy welded joints in seawater pipeline system was analyzed under local turbulence induced by weld residual height. The corrosion behavior was evaluated by array electrode technology, morphology and elemental characterization, and COMSOL Multiphysics simulation. The results provide a theoretical basis for the corrosion and leakage of B10 alloy in seawater pipeline under the action of turbulence. The results show that residual height-induced turbulence exhibits a significant effect on the corrosion behavior in different areas of welded joints in B10 alloy. Turbulence can damage some surfaces, causing polarity deflection followed by acceleration of corrosion, or it is easier to form a protective film to slow down corrosion. COMSOL Multiphysics results show that the shear rate and turbulent kinetic energy increase linearly with the increase in residual height and velocity. The corrosion behavior of alloy surface is influenced by controlling the mass transfer rate and surface state.