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Industrial pure titanium has good wear and corrosion resistance, why does it still exhibit severe wear and corrosion in some media?

What protective measures should be taken during design? Severe corrosion still occurs in certain highly corrosive media (such as urea ammonium solution), such as the carbon dioxide inlet pipe of the urea synthesis tower. Due to the large amount of carbon dioxide gas dissolved in the urea ammonium solution at the pipe end, the solution impacts the pipe wall, causing the passivation film on the surface to be damaged and exacerbating corrosion. The corroded surface further intensifies impact wear, causing it to form corrosion pits.

To prevent the occurrence of abrasion. The following measures should be taken during design:

a. Try to reduce the flow velocity of the medium as much as possible, avoid sudden changes in the cross-sectional size and direction of the flow channel, and reduce the scouring effect of the medium on the titanium surface;

b. Surface treatment such as nitriding and oxidation on titanium to improve wear and corrosion resistance;

c. Removable or replaceable linings (such as liners) should be added or more corrosion-resistant materials should be used for unavoidable worn surfaces.

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