Titanium has excellent corrosion resistance in both river water and seawater. Especially in seawater, the corrosion resistance of titanium is 100 times that of stainless steel. Titanium is the most corrosion-resistant metal material in natural water. Titanium may discolor or lose light in high-temperature water and steam (such as>300 ℃), and even gain a little weight, but it will not cause corrosion. Titanium is very resistant to corrosion in seawater with a temperature of up to 260 ℃. Titanium tube condenser has been used in polluted seawater for more than 20 years, and only slight discoloration without corrosion is found. Industrial pure titanium has good resistance to crevice corrosion, spot corrosion, and impact corrosion in seawater, and its sensitivity to stress corrosion and corrosion fatigue is not serious. In the high-velocity flowing seawater (for example, 36.6 m/s), the erosion velocity is slightly increased. When seawater contains abrasive particles such as sand, it has some impact on the erosion resistance of titanium, but it is not as serious as copper alloy and aluminum alloy. In seawater, titanium is also the most ideal anti-cavitation corrosion material. However, since titanium is neither corrosive nor toxic in seawater, it is a good place for marine organisms to attach, which is an urgent problem in practical application.
