NUMERICAL SIMULATION OF FLOW INDUCED CORROSION OF DUPLEX STAINLESS STEEL IN LIQUID-PARTICLE TWO-PHASE IN-PIPE FLOW

On the basis of numerical simulation of flow induced corrosion of carbon steel in two-phase flow, the flow induced corrosion of duplex stainless steel in liquid-particle two-phase in-pipe flow was numerically studied. The results showed that, by numerically simulating liquid-particle two-phase flow kinetic process and duplex stainless steel corrosion kinetics, the corrosion rates of duplex stainless steel were computed and the numerical corrosion rates were well in agreement with measured ones. This illustrates that the established corrosion overall model for duplex stainless steel in two-phase fluid is correct and at the same time its flow induced corrosion mechanism is uncovered and verified by tests. The presence of particle phase in fluid greatly strengthens hydrodynamic factor,leading to faster mass transfer process in passive film of duplex stainless steel than liquid single-phase, and causing serious erosion-corrosion. The modeled results also show that the ability to simulate corrosion of materials with surface passive film to some extent depends on their corrosion kinetics process tested by experiments.