Principles of corrosion resistance of titanium materials

We often say that titanium has very good corrosion resistance, so why is its corrosion resistance so excellent? This is because Tai itself is a passivating metal.Its good corrosion resistance is mainly due to the dense and uniform titanium oxide layer (TiO2 layer) formed in the oxidizing environment. This oxide layer can effectively isolate the titanium matrix from the external environment, thereby preventing corrosion from corrosive substances.

In an oxidizing environment, a titanium oxide passivation film will be formed on its surface. This passivation film is not damaged by chlorine ions. Even if it is damaged, it can quickly heal itself in an oxidizing environment. , and form a new protective film. Therefore, it is also completely corrosion-resistant in seawater and marine atmosphere, and its corrosion resistance is not inferior to that of stainless steel and copper alloy.

Therefore, titanium can also be used directly in some equipment that comes into contact with seawater or marine engineering equipment or accessories that are exposed to the air, such as ship shells, pumps, valves, pipe joints, condensers, heat exchangers, and Binhai Bridge, etc.,

In addition, the titanium oxide layer has self-healing capabilities. Even if the titanium oxide layer on the surface is slightly damaged, titanium can be regenerated through oxidation to regenerate a new titanium oxide layer, thereby repairing the original protective layer. This is also one of the important reasons why titanium has good corrosion resistance.

In addition, titanium also has the ability to resist corrosion from corrosive solutions. Because the titanium matrix has an irregular lattice structure and a stable oxide phase, titanium can maintain good stability in many acid, alkali and salt solutions and is not easily corroded.

All in all, the corrosion resistance of titanium mainly comes from its good oxide layer and self-healing ability, as well as its own resistance to erosion by corrosive solutions. These characteristics make titanium widely used in many industrial fields, such as aerospace, chemical industry, marine engineering, etc.