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Analysis of the Application of Titanium Alloy in the Chemical Industry

In the chemical industry, various acids, bases, and salts are widely used. Do you know which category the main types of acids belong to?
What corrosion can titanium alloy products withstand? What kind of corrosion can't it withstand?
Titanium alloy Ti-TC4 (Ti6AL4V) has a density of 4.51g/cm3, which is approximately half of nickel alloy HC276.
1、 Types of Acids
1. Oxidative acid
Representative products: sulfuric acid, nitric acid
2. Reducing acid
Representative products: hydrochloric acid, phosphoric acid
3. Organic acids
Representative products: oxalic acid, butyric acid, lactic acid, maleic acid, hydroxysuccinic acid (benzoic acid), tannic acid, and tartaric acid
4. Highly corrosive acid hydrofluoric acid (HF)
2、 Titanium alloy, using the commonly used Ti-TC4 as an example for explanation
1. Corrosion resistance
Generally not resistant to the corrosion of reducing and oxidizing acids mentioned above. Only under low concentration and temperature conditions can it withstand certain corrosion.
1. Suitable for phosphoric acid at 20 ℃, 30% or 35 ℃, 20%;
2. Suitable for room temperature conditions, 3% and 100 ℃, 0.5% hydrochloric acid solution;
3. It has good corrosion resistance in gasoline, toluene, phenol, formaldehyde, trichloroethane, acetic acid, citric acid, and ethyl chloride
4. In oxalic acid, butyric acid, lactic acid, maleic acid, hydroxysuccinic acid (benzoic acid), tannic acid, and tartaric acid, etc
5. In dilute alkaline solution (concentration below 20%)
6. Suitable for dynamic, static seawater, and marine atmospheric environments
6. Suitable in humid environments (with a moisture content of 1.5%) containing chlorine gas, the surface will passivate and form a protective film
7. Highly stable in neutral or weakly acidic oxide solutions
8. Stable performance in 100% monochloroacetic acid and 100% dioxoacetic acid
9. In most chloride containing compounds, the neutral energy is stable, such as in 100 ℃ FeCL, 100 ℃ CuCL2, 100 ℃ HgCL (all concentrations), 60% AlCL2, and all concentrations of NaCL solutions at 100 ℃.
10. It is stable in a solution of sodium hypochlorite (NaSO2), hydrogen peroxide, hydrogen peroxide, and sodium hydroxide at 100 ℃.
2. Not corrosion-resistant:
1. Formic acid, oxalic acid, and equivalent concentrations of citric acid;
2. Cannot be used in high temperatures, high concentrations of oxidizing and reducing acids
3. Instability in concentrated alkaline solutions can lead to the formation of titanates;
4. 130 ℃, 73% sodium hydroxide solution is suitable, but hydrogen embrittlement may occur. It is recommended to use it in alkaline solutions below 90 ℃
5. Hydrofluoric acid solution
6. A dry chlorine environment can cause violent reactions and even combustion.
In summary, Ti-TC4 is suitable for most chemical applications and is one of the corrosion-resistant materials.
Our company can provide instruments and accessories for different Ti-TC4 processing, such as electromagnetic grounding rings, pressure transmitter installation accessories, etc.

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