Titanium and its alloys have many excellent properties, such as light weight, high strength, high heat resistance, corrosion resistance and so on. They are known as the metal of the future and a new structural material with a future development. Titanium and its alloys not only have very important applications in aviation and space navigation industry, but also have been widely used in chemical industry, petroleum, light industry, metallurgy, power generation and other industrial sectors. Titanium in the chemical industry and other departments of the application of another significant characteristic of titanium is strong corrosion resistance, this is because of its affinity to oxygen is particularly large, can generate a layer of dense oxide film on its surface, can protect titanium from media corrosion. A passivated oxide film can be formed on the surface of titanium in most aqueous solutions. Therefore, titanium in acidic, alkaline, neutral saline solution and oxidation medium has good stability, corrosion resistance than the existing stainless steel and other non-ferrous metals are good, and can even be compared with platinum. However, if the oxide film on the surface of titanium can be continuously dissolved in a certain medium, the titanium will be corroded in this medium. For example, titanium in hydrofluoric acid, concentrated or hot hydrochloric acid, sulfuric acid, and phosphoric acid, as these solutions dissolve oxide film on the surface of titanium, titanium is corroded. If the oxidizer or some metal ions are added to these solutions, the oxide film on the surface of titanium will be protected and the stability of titanium will be increased. Chemical industry titanium in a variety of acid, alkali, salt media, in addition to the above four inorganic acids and corrosive aluminum chloride is very strong, all have good stability. Therefore, titanium is an excellent anti-corrosion material in chemical industry, and has been used more and more widely. For example, the use of titanium metal anode and titanium wet chlorine cooler in the chlor-alkali industry has received very good economic effects and is known as a revolution in the chlor-alkali industry.
Titanium in the petroleum industry in the organic compounds, except for the temperature of the five organic acids (formic acid, acetic acid, oxalic acid, trichloroacetic acid and trifluoroacetic acid), has a very good stability. Therefore, titanium is an excellent structural material in petroleum refining and petrochemical industry, which can be used to make various heat exchangers, reactors, high-pressure vessels and distillation towers. Titanium in metallurgical industry is an active metal with good suction performance and is an excellent degassing agent in steel-making industry. It can combine oxygen and nitrogen precipitated out of steel during cooling. A small amount of titanium (<0.1%) is added to steel to make it strong and elastic. Titanium is also an important alloy additive in steelmaking, aluminum smelting and other industries. Titanium is a common superconducting material with superconductivity. In addition, titanium in the acid solution containing metal ions has good stability, so titanium in the hydrometallurgical industry.
