Also, stress corrosion does not equally affect all classes of titanium alloys. Stress corrosion occurs when a susceptible metal is subjected to constant tensile stress.Įven if a metal is vulnerable to stress corrosion, it is impossible to realize it without applying optimum tensile stress. Stress corrosion can occur if you expose pure titanium to methanol at 70 oC) solutions containing chloride, fluoride, bromide, or sulfate. But what if there is no oxygen? In an oxygen-free environment like a vacuum, titanium is just as vulnerable to corrosion as any other metal. The thin layer of titanium oxide protects the metal beneath. Titanium’s susceptibility to corrosion depends on two factors mainly the amount of oxygen or moisture and the nature of exposure. Alloys of titanium also have similar attributes. Pure titanium has the highest rust resistance property. Titanium is rust-resistant but not completely rust and corrosion-proof. In environments devoid of oxygen, titanium can readily corrode. Also, the presence of oxygen is a must to protect titanium. Titanium alloys are prone to rust and corrosion depending on the alloying elements. However, this only applies to pure titanium. In a high-temperature atmosphere, titanium oxide (TiO) is formed. In aqueous environments, titanium forms titanium dioxide (TiO2) with oxygen. Two, this layer steadily grows in thickness, which strengthens the protection.ĭepending on the environment, the composition of the oxide can vary. One, it protects the underlying metal from further reacting with anything. When titanium contacts with oxygen, it forms a very thin oxide layer. Its reactive nature protects it from corrosion. So ‘rusting’ and ‘corrosion-resistant’ don’t seem to go together. Rust and corrosion are the results of the reactivity of a metal. But at the same time, it is also very rust-resistant. As far as titanium is concerned, it’s a highly reactive metal. But this term is used interchangeably with corrosion. Other metallic elements and alloys also corrode, but not because of rust. The reaction is elaborate but to summarize it: when iron comes in contact with water or moisture, it reacts with oxygen and hydrogen to form hydrated iron oxide. It’s the reddish coating on the surface of iron that results from oxidation.
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