Mechanical Properties Evolution of the 7B04-T74 Aluminum Alloy in the Marine Atmosphere

The 7xxx-series aluminum alloys are widely used in aircrafts due to their superior performance. evolution of the mechanical properties caused by marine atmospheric corrosion has become a research hotspot increase aircraft service time environment. In this work, 7B04-T74 alloy was studied an alternate immersion test. surface microstructure analyzed SEM, EDS, XRD, and OM. influence on tensile fatigue tests. results show that good resistance, as only pitting occurs remained fundamentally same before after corrosion. were severely reduced, but localized affected initiation stage crack had little effect propagation process.