Titanium is a precious metal that has relatively low relative density, high strength, and high specific strength. Now I will introduce the corrosion resistance properties of titanium and titanium plate materials. We will know the occasions and functions that titanium pumps and titanium plate pumps can use. Excellent corrosion resistance in specific environments. Titanium pump, titanium plate pump is a kind of strong anti-corrosion pump, suitable for strong alkali and strong acid, so it is also called alkali strong acid pump. The key to its strong corrosion resistance is the titanium metal material.

Titanium after alloying, can greatly increase its strength (the most widely used is TC4, etc.).

Titanium and Titanium Plates Corrosion Resistance Titanium has a high degree of stability in neutral or slightly acidic oxide solutions. For example, titanium and titanium plates in 100 °C FeCl 100 °C CuC12, 100 °C HgCl: (all concentrations ), 60% of AlCl2 and all concentrations of NaCl at 100°C are stable, and many other metal oxides of titanium are also stable in 100% monoacetic acid and 100% dioxyacetic acid, thus making titanium and Titanium plate has been widely used in the above solution.

Titanium and titanium plates have high corrosion resistance in gasoline, **, phenol, formaldehyde, trichloroethane, acetic acid, citric acid, monochloroethylene, etc., but at the boiling point and without aeration, titanium In formic acid with a mass fraction of less than 25%, it is severely corroded. In a solution containing ***, titanium not only suffers from severe overall corrosion, but also produces pitting corrosion. For many complex organic media that are involved in the organic synthesis process, For example, in the production of propylene oxide, phenol, **, chloroacetic acid and other chemical media, the corrosion resistance of titanium and titanium plates is better than that of stainless steel anodes.

Titanium and titanium plates also have a high degree of stability for ion-containing oxidant solutions, such as sodium hypochlorite solution of 100 qC, oxygen water, gases (up to 75° C.), and sodium oxide solutions containing hydrogen peroxide. The corrosion resistance of titanium and titanium plates exceeds that of other commonly used metals in wet sluice. This is because chlorine has a strong oxidizing effect. Titanium and titanium plates can be stably passive in wet chlorine. In order to maintain titanium in The bluntness requires a certain moisture content. Critical water content is related to oxygen pressure, flow rate, temperature and other factors, but also related to the shape and size of titanium equipment or components and the degree of mechanical damage on the surface of titanium. Therefore, the critical moisture content of titanium in oxygen passivation is inconsistent in the literature. , It is generally believed that the mass fraction of 0.01% to 0.05% can be used as the critical moisture content of titanium in oxygen, but the actual experience points out that in order to ensure the safe use of titanium equipment in oxygen, sometimes the water mass fraction of 0.6% is not enough, need to reach 1.5%. Critical water content also increases with increasing temperature and decreasing gas velocity.

The actual operating experience also shows that after the surface oxide film of titanium and titanium plates is damaged, a higher water content is required to repassivate the titanium and titanium plates. Titanium and titanium plates can react violently to form titanium tetrachloride in dry atmosphere even below 0°C, and there is a danger of fire. After the destruction of the titanium and titanium plates in the dry process, the reaction was collapsed and the addition of water could not stop the reaction.

The behavior of titanium in the dry and wet boundary areas has not been fully understood. According to thermodynamic analysis, titanium and chlorine cannot exist in equilibrium at room temperature. According to the thermodynamic free energy, stable compounds are formed in this reaction system. Titanium does not coexist with water and will react further.

TiC14+4H20. Ti(OH)+4HC1

Therefore, the reaction between chlorine and titanium can be explained simply: Titanium reacts with chlorine to form titanium tetrachloride: titanium tetrachloride is a liquid at room temperature, and its boiling point is 136. C. The reaction to produce titanium tetrachloride is accompanied by an exothermic process. If ** is in a dry state, a large amount of heat is released so that the reaction reaches a very high temperature, and when the temperature reaches the melting point of titanium, titanium starts to burn. Thereafter, as long as there is sufficient chlorine, the reaction will proceed vigorously until the reactants are exhausted. However, if there is enough moisture in **, titanium tetrachloride will react with water to form titanium hydroxide. It is a non-volatile material and it becomes a film firmly attached to the surface of titanium. This reaction is Very stable reaction, and the surface film is extremely stable in wet chlorine. Therefore, titanium has excellent corrosion resistance in wet chlorine, and its stability is closely related to the moisture content in **.