Abstract: The airborne electronic devices face the corrosive and magnetic field coupled environment in service. In this study, a corrosion-magnetic field coupling simulation model is established to investigate the influence mechanism of the applied magnetic field on the atmospheric corrosion behavior of H62 copper alloy under a NaCl thin electrolyte layer. The simulation results show that the parallel magnetic field drives charged ions to migrate toward the electrode surface through the Lorentz force (F_L), significantly enhancing the flow rate of the electrolyte and electrochemical reaction rate. Compared with the perpendicular magnetic field, when the magnetic induction intensity of the the parallel magnetic field is 25 mT, the electrolyte flow rate increases from 1.53 × 10^-4 to 2.32×10^-4 m/s, the current density increases from 63.9 μA/cm² to 136.0 μA/cm², and both exhibit a nearly linear positive correlation with the magnetic induction intensity. The perpendicular magnetic field induces circumferential electrolyte flow via the magnetohydrodynamic (MHD) effect, reducing the thickness of the diffusion layer. The perpendicular magnetic field's accelerating effect on corrosion is weaker than that of the parallel magnetic field, and when the magnetic induction intensity exceeds 15 mT, the accelerating effect of the magnetic field on corrosion diminishes with increasing induction intensity. The finding reveals the differential influence mechanisms of magnetic fields on corrosion behavior, providing theoretical support for the corrosion protection and electromagnetic shielding design of copper alloy materials for electronic devices.