Comparison of Corrosion Behavior of Two Typical Titanium-AluminumDouble-Ear Two-Layer Structures in a Corrosive Environment

Accelerated corrosion tests were carried out on two typical titanium-aluminum double-ear two-layer structures with stainless steel bushing and copper bushing. The corrosion morphology and corrosion products were analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), and the corrosion resistance of the two structures was compared. The results showed that corrosion fatigue damage happened in these two kinds of structures in the corrosive environment. The corrosion fatigue cracks in the aluminum alloy of the structure with stainless steel bushing formed early, and the fracture corroded seriously. The serious corrosion of aluminum alloy near copper bushing was the main reason for inducing corrosion fatigue damage of the structure. Delaying fatigue crack formation and reducing galvanic corrosion could improve the corrosion resistance of the structure with stainless steel bushing. While reducing the stress level of the structure and strengthening the daily maintenance could effectively improve the corrosion resistance of the structure with copper bushing.