Introduction to the performance of titanium alloy corrosion resistance
Titanium alloy is a highly reactive material, and titanium has good corrosion resistance in many corrosive media. As long as there is sufficient oxygen, even if the film is mechanically damaged, the film itself can immediately self-heal or regenerate.
(1) The corrosion resistance of titanium is affected by the surface oxide film, making this material more suitable for use in oxidative environments or places where oxygen is readily available. In reducing solutions, titanium will react with the solution to produce hydrogen gas.
(2) Like all metals, when titanium comes into direct contact with different metals in an electrolyte, it will form a galvanic couple. After the galvanic couple is formed, the corrosion rate of one or both metals will be much faster than before the couple was formed. In almost all cases, titanium is the more inert pole of the galvanic couple, which leads to increased corrosion of the other metal. The degree of corrosion depends on the relative area ratio and the actual electrolyte used, so galvanic couples should be avoided when designing equipment.
Titanium alloy
(3) Generally, titanium alloys are only used in situations where the corrosion rate is very slow, so there is no need to provide corrosion tolerance when designing equipment. This makes it possible to use relatively thin titanium plates for carbon-titanium containers, heat exchanger end boxes and tube sheets, pumps, valves, etc. Thin titanium tubes can also be used for tubular heat exchangers and thin titanium plates for plate heat exchangers to reduce equipment costs and improve heat exchange performance. Since the passivity of titanium depends on the presence of the oxide film, its corrosion resistance in oxidative solutions is significantly better than in non-oxidative solutions. Titanium can corrode at a relatively high rate in non-oxidative media. Therefore, titanium can be used in various concentrations of aqueous nitric acid below its boiling point. Similarly, it does not corrode in wet chlorine gas. It also does not corrode in chloride solutions, such as sodium chloride and hypochlorite solutions. The oxide protective film on the surface of titanium is usually formed in contact with water; even a small amount of water or water vapor can generate the protective film. Therefore, if titanium is exposed to a completely anhydrous high-strength oxidative environment, rapid oxidation will occur, often leading to combustion. This phenomenon can occur in reactions between titanium and dry nitric acid and between titanium and dry chlorine gas. However, in such cases, as long as there is a very small amount of moisture (even just 50 ppm), this corrosion can be avoided. There is no indication that titanium produces pitting or stress corrosion in aqueous solutions of inorganic metal chlorides. In seawater, even under high-speed scouring, titanium also has good corrosion resistance. Although theoretically titanium alloys should undergo significant corrosion in media such as sulfuric acid and hydrochloric acid, resulting in the generation of hydrogen gas, as long as there is a small amount of oxidant in the acid, a passivation film can form on the surface of titanium.
In strong hydrochloric acid containing free chlorine gas, titanium also exhibits corrosion resistance. If copper ions or iron ions are present in the solution, they can also reduce the corrosion rate of titanium, which is equivalent to alloying with precious metals or using anodic passivation technology.
More information
What are the five main characteristics of titanium plates?
Features: 1. The titanium seed plate has a surface oxide film that acts as a good, durable release agent, saving the use of release agents and making the peeling of the plates easier, eliminating the need for pre-treatment of the seed plates. The titanium seed plate is half the weight of the copper seed plate. 2. The lifespan of the titanium seed plate is more than three times that of the copper seed plate, and can reach 10 to 20 years depending on operating conditions. 3. The electrolytic copper produced using titanium seed plates has a dense crystalline structure, a smooth and flat surface, and high quality. 4. Since titanium seed plates do not require the application of release agents, they can avoid contamination of the copper electrolyte. 5. Increased production capacity reduces the production costs of electrolytic copper, resulting in better economic benefits.
What are the technical requirements for titanium pipes?
Titanium pipes are lightweight, have high strength, and excellent mechanical properties. They are widely used in heat exchange equipment, such as shell-and-tube heat exchangers, coil heat exchangers, serpentine tube heat exchangers, condensers, evaporators, and transport pipelines. Many nuclear power industries use titanium pipes as standard pipes for their units.
Technical requirements:
1. The chemical composition of titanium and titanium alloy pipes should comply with the provisions of GB/T3620.1. When the buyer conducts re-inspection, the allowable deviation of the chemical composition from Mingkun Titanium Industry should comply with the provisions of GB/T3620.2.
2. The allowable deviation of the outer diameter of the pipe should comply with the specifications in Table 1.
3. The allowable deviation of the wall thickness of the pipe should not exceed its nominal wall.
What should be noted when filtering materials with titanium pipes?
Precautions: 1. If using titanium plate as a filtering material, it must not exceed its maximum working capacity. 2. When using titanium plates as filtering materials, be sure to prevent the plates from being bumped or scratched, and keep them clean to avoid contamination. 3. After using the titanium plate material, it must be cleaned and stored properly. 4. Before starting work, the titanium plate filtering material must be activated before adjusting to the normal working environment.
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