Does Titanium Rust?

Will be.

Corrosion is a chemical reaction in which part or all of a metal surface is stripped, dissolved, or softened. The word "rust" is often misused or misunderstood and refers only to iron and steel. "Corrosion" includes not only ferrous metals but also non-ferrous metals.

Titanium is a very active metal with low equilibrium potential and high thermodynamic corrosion tendency in media. But in fact titanium in many media is very stable, such as titanium in oxidation, neutral and weak reducing media is corrosion resistant. This is because titanium and oxygen have a great affinity, in the air or oxygen-containing medium titanium surface to generate a layer of dense, strong adhesion, inert oxide film, protect the titanium matrix from corrosion. They heal or regenerate quickly even due to mechanical wear. This indicates that titanium is a metal with a strong passivation tendency. The titanium oxide film always maintains this characteristic when the medium temperature is below 315℃.

In order to improve the corrosion resistance of titanium, surface treatment technologies such as oxidation, electroplating, plasma spraying, ion nitriding, ion implantation and laser treatment have been studied, which enhanced the protective effect of titanium oxide film and obtained the desired corrosion resistance effect. A series of corrosion-resistant titanium alloys, such as ti-molybdenum, ti-palladium, ti-molybdenum and nickel, have been developed to meet the needs of metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high temperature wet chlorine and high temperature chloride. Ti-32 molybdenum alloy is used in titanium castings, ti-0.3 molybdenum-0.8 nickel alloy is used in the environment where crevice corrosion or pitting corrosion often occurs, and ti-0.2 palladium alloy is used in parts of titanium equipment.

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