Abstract:The corrosion fatigue properties of ZCuAl9Fe4Ni4Mn2 copper alloy and the main material for marine engineering were studied in this study. The corrosion fatigue strength, corrosion fatigue crack growth rate, corrosion fatigue crack growth path and corrosion fatigue fracture morphology of ZCuAl9Fe4Ni4Mn2 copper alloy were analyzed and tested by pure bending fatigue testing machine, electro-hydraulic servo material testing machine and scanning electron microscope (SEM). Under the condition of 1×107 cycles, the conditional fatigue strength of ZCuAl9Fe4Ni4Mn2 copper alloy was 204 MPa. Under the condition of 90% confidence and 10% failure probability, the corrosion fatigue strength of ZCuAl9Fe4Ni4Mn2 copper alloy was 185.9 MPa. Under the condition of load ratio (R)=0.1, the Paris formula of ZCuAl9Fe4Ni4Mn2 copper alloy was da/dN=1.7670×10-12×△K5.8899. The corrosion fatigue crack started at the corrosion hole on the specimen surface and expanded in a river-like pattern. Secondary cracks would appear on the expansion path, and the crack growth would go through the first stage, the second stage, and then expand at a high speed until the fracture stage. The fatigue band generally appeared in the second stage of crack growth, where the crack growth rate was moderate and follows the Paris power law relation. The propagation direction of fatigue crack was perpendicular to the fatigue band. This study could provide an important reference for evaluating the service life of ZCuAl9Fe4Ni4Mn2 copper alloy components.