Simulation of Multi-Metal Coupling Corrosion Behavior Based on COMSOL

Disassembling a multi-metal coupling system into multiple dual-metal galvanic couples, and using the finite element simulation software COMSOL to compare the magnitude of the coupling current between dual-metal galvanic couples, a method to judge the cathode and anode states of the multi-metal coupling corrosion model based on intermediate potential metal was established. Taking high strength steel, B10 copper nickel alloy and TA2 titanium alloy triple metal coupling system as an example, the effects of the comparison of electrode ordering and cathode/anode area ratio of the multi-metal coupling system were simulated. The results showed that under different electrode ordering conditions, the intermediate potential metal B10 copper nickel alloy was always used as a cathode to participate in galvanic corrosion. When the electrode ordering was the same, the current density on the surface of high strength steel of coupling system was increased with the increase of B10 and TA2 area ratio. The current density on surface of high strength steel of coupling system of different electrode ordering was B10 copper nickel alloy-high strength steel-TA2 titanium alloy, high strength steel-B10 copper nickel alloy-TA2 titanium alloy, B10 copper nickel alloy-TA2 titanium alloy-high-strong strength steel.