Titanium has excellent corrosion resistance

The passivation of titanium depends on the existence of oxide film. Its corrosion resistance in oxidizing media is much better than that in reducing media, and high-rate corrosion can occur in reducing media. Titanium is not corroded in some corrosive media, such as seawater, wet chlorine, chlorite and hypochlorite solutions, nitric acid, chromic acid, metal chlorides, sulfides, and organic acids. However, in the medium that reacts with titanium to generate hydrogen (such as hydrochloric acid and sulfuric acid), titanium generally has a larger corrosion rate. However, if a small amount of oxidant is added to the acid, the titanium will form a passivation film. Therefore, in a mixture of sulfuric acid-nitric acid or hydrochloric acid-nitric acid, even in hydrochloric acid containing free chlorine, titanium is corrosion-resistant. The protective oxide film of titanium is often formed when the metal comes into contact with water, even in the presence of a small amount of water or water vapor. If titanium is exposed to a strong oxidizing environment with no water at all, it can quickly oxidize and produce violent, often spontaneous combustion reactions. This type of behavior has occurred in the reaction of titanium with fuming nitric acid containing excessive nitrogen oxides and titanium with dry chlorine gas. However, to prevent the occurrence of reactions in this state, a certain amount of water is necessary.
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