Titanium and titanium alloys have a wide range of applications and applications, and have been extensively used in ship and marine engineering since the mid-1960s. Submarine Whip Antenna, Seawater Pipes, Condensers and Heat Exchangers, Acoustic Devices, Fire Fighting Equipment and so on. Main applications are industrial pure titanium (TAO-10), Ti-6Al-4V (TC4), Ti-6Al-2Nb-1Ta-0.8Mo, Ti-3Al-2.5V (TA4), and so on.
Ti-Ni alloys with shape memory properties have served as couplers in submarines. This connector is very difficult to weld, the use of shape memory alloy to solve the problem, is very suitable for working in the sea.
Titanium in the rivers and lakes in the sea has a very good corrosion resistance, especially for seawater corrosion has a strong tolerance, extremely valuable.
It is fair to say that the corrosion resistance of titanium in all natural water is second to none in all metallic materials. Titanium in the high temperature water and water vapor (> 300 will lose luster, but will not corrode.
Titanium is still resistant to corrosion in water at 260 C. Titanium tube condensers are still intact after only 25 years of work in polluted seawater, with little discoloration and no signs of corrosion. However, because titanium seawater is neither corrosive nor toxic, will be attached to a large number of marine life, not easy to clear, become a real problem of trouble. Industrial unalloyed titanium is very resistant to seawater crevice corrosion, point corrosion and erosion corrosion, stress corrosion and corrosion fatigue sensitivity is not large. The rate of erosion in high-speed mobile seawater (eg 36.6 m / s) will increase. When the seawater contains sand and other friction particles, the impact resistance of titanium have some influence, but much lighter than copper and aluminum alloy. Titanium in seawater is also the best anti-cavitation corrosion material.
The bottom of the Pacific there are tens of billions of tons of manganese nodules and small pieces of grain, is a very valuable inexhaustible minerals, in addition to manganese, but also contains a dozen useful and rare non-ferrous metals, But how to mine them out is a not yet a complete solution to the world problems. The US idea is to use the titanium alloy on the deep-sea ship to take out the manganese nodules, each deep-sea ship with hundreds of Ti-6Al-4V (TC4) alloy tube, tube specifications: wall thickness 10mm, Diameter 250mm. Mining of manganese structure of the deep-sea marine vacuum pump with manganese nodules of water pumping up, this pump must be able to withstand 5000m ~ 6000m deep seawater pressure, and requires resistance to seawater corrosion and abrasion resistance extraordinary ability, titanium alloy is to create this Pump the most cost-effective material.
