Ti-6Al - 4V titanium alloy with low density, high strength, good toughness, corrosion resistance, good processing performance, etc., is an ideal material for aerospace engineering structures.

Titanium is a new structural material, it has excellent performance, such as low density (~ 4.5g cm-3), strength and fracture toughness than the ratio, strength and resistance to fatigue crack propagation ability, good low-temperature toughness, resistance excellent corrosion properties, the maximum operating temperature of some titanium alloys for 550ºC, is expected to reach 700ºC. So it gets increasingly widely used in aerospace, chemical, medical, shipbuilding and other industrial sectors, is developing rapidly.

   Another notable feature is the corrosion resistance of titanium, which is the oxygen affinity of titanium is particularly large, able to generate a dense surface oxide film to protect against corrosion medium titanium. In most aqueous solutions of metal titanium, can generate passive oxide film on the surface. Therefore, the titanium in acidic, alkaline, neutral saline solution and oxidizing medium has good stability, but in a medium, the titanium oxide film surface can be continuously dissolved in this medium will be titanium corrosion. For example, hydrofluoric acid, hot concentrated hydrochloric acid, and phosphoric acid flow, since the surface of the titanium oxide film was dissolved, so titanium corrosion. If adding an oxidizing agent or certain metal ions in these solutions, the surface of the titanium oxide film will be protected.