Titanium is a metal with a strong passivation tendency, which can quickly generate a stable oxidizing protective film in air and oxidation or neutral aqueous solution, even if the film is damaged for some reasons, it can quickly and automatically recover. Therefore, titanium has excellent corrosion resistance in oxidizing and neutral media. Due to the huge passivation properties of titanium, in many cases, when in contact with dissimilar metals, corrosion is not accelerated, but may accelerate the corrosion of dissimilar metals