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2022

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07

Corrosion resistance of titanium


Titanium is a very active metal, its equilibrium potential is very low, and its thermodynamic corrosion tendency in the medium is large. But in fact, titanium is very stable in many media. For example, titanium is corrosion-resistant in oxidizing, neutral and weak reducing media. This is because titanium has a great affinity with oxygen. In air or oxygen-containing medium, a dense, adhesive and inert oxide film is formed on the surface of titanium, which protects the titanium matrix from corrosion. Even due to mechanical wear, it will soon self heal or regenerate. This indicates that titanium is a metal with strong passivation tendency. When the medium temperature is below 315 ℃, the oxide film of titanium always maintains this characteristic.

active,equilibrium