This study investigates the fatigue behavior of AlSi9Cu3 aluminum die-cast alloy after exposure to accelerated corrosive condi-tions. It underscores the significant impact of minor localized corrosion imperfections on fatigue strength and presents a numer-ically efficient method for fatigue assessment based on fracture mechanics principles. Fatigue tests under rotary bending loadshowed a 34% reduction in long-life fatigue strength for precorroded surfaces compared to polished ones. Numerical simulations,which treated the precorrosion as a single crack-like surface imperfections, provided good estimates of fatigue life, when usingthe mean corrosion depth as initial flaw depth. Variations in the assessed fatigue strengths for different flaw geometries and sizesranged from 13.7% above to 22.2% below the experimental values. The findings underscore the importance of incorporating shortcrack propagation, particularly for small corrosive defects, in fatigue assessments to enhance accuracy and ensure componentreliability and safety when corrosion-induced imperfections are present.