For today's aviation industry, reducing fuel consumption in aircrafts has become one of the most important goals. Therefore, the use of lightweight materials, such as CFRP (carbon fiber reinforced plastic), aluminum, magnesium, or titanium has increased. Different combinations of materials that may be electrically in contact with each other in the presence of moisture cause galvanic corrosion. Especially, pits caused by galvanic corrosion jeopardize the structural strength of an aircraft. Within the scope of this work, an experimental setup was developed for the validation of a finite element model (FEM) for simulating galvanic corrosion of 2024-T3 sheet and CFRP in a 5 wt% NaCl solution. Corrosion parameters of both materials were determined separately by potentiodynamic polarization experiments. The critical distance for galvanic corrosion-induced pitting on the aluminum alloy surface and the maximum pit depth were determined by FEM and confirmed by immersion tests in the same environment.