Galvanic Corrosion Behavior of 7B04 Aluminum/TC16 Titanium Alloy Joints After Anodized Oxidation and Its Effect on Fatigue Life

The galvanic corrosion behavior of anodized 7B04 aluminum/TC16 titanium alloy joints in different corrosion time and its effect on fatigue life were studied, providing a basis for structural corrosion and protection of typical joints of aircraft. The results show that corrosion begins near the coupling parts in the early stages of corrosion. A high concentration of Cl– can damage the anodic oxide film on the surface of the 7B04 aluminum alloy, resulting cracking and pitting corrosion. The fatigue life of joints with corrosion was longest for 40 h, after which the fatigue life shortened rapidly. And sulfuric acid anodizing treatment of the 7B04 aluminum alloy plate was not conducive to the corrosion fatigue life of the specimen at the later stages of corrosion. The crack initiation of the specimen was located at the edge of the bolt hole.