Anti-corrosion application of titanium material in power industry

Titanium has good stability in highly corrosive hot water containing chlorides and sulfides, so it has been widely used as a cooling pipe for heat exchangers of thermal power plants. After the thin-wall titanium tube is used to replace the copper-nickel alloy tube, not only the service life is greatly improved, but the overhaul time is greatly reduced, and the economic benefits are significant.

Titanium and titanium alloys have good corrosion resistance and can also be used as anti-corrosion linings for steel chimneys. Titanium plates are used as anticorrosive linings for steel chimneys of wet chimneys.

Technically pure titanium is a thermodynamically unstable metal. If Ti2 + can be produced by dissolution, the standard electrode potential for titanium ionization is -1.63 V, which makes titanium soluble in water and releases hydrogen. However, in a variety of corrosive media, titanium has very strong corrosion resistance, which is due to its large passivation effect. Its passivation exceeds that of cobalt, nickel and stainless steel. In many active media, especially in oxidizing media, chlorine and chloride media, it has excellent corrosion resistance, but titanium has poor stability in sulfuric acid and hydrochloric acid. In order to solve the problem of poor corrosion resistance of conventional titanium and titanium alloys to reducing media such as sulfuric acid and hydrochloric acid, the addition of molybdenum (10% 32%) to titanium alloys can greatly improve the corrosion resistance of titanium alloys to reducing media. The higher the molybdenum content, the better the corrosion resistance, but the more difficult it is to smelt and process. The main performance is the strengthening of the alloy, which affects the application of the alloy to a certain extent. Titanium molybdenum alloy is more suitable for corrosion protection of steel chimney than pure titanium. Ti-20MO and above titanium molybdenum alloys can meet the requirements, and because they have strong resistance to chlorides, they are especially suitable for power plants using seawater desulfurization. The higher the molybdenum content, the better the corrosion resistance, but the more difficult it is to smelt and process. The main performance is the strengthening of the alloy, which affects the application of the alloy to a certain extent. Titanium molybdenum alloy is more suitable for corrosion protection of steel chimney than pure titanium. Ti-20MO and above titanium molybdenum alloys can meet the requirements, and because they have strong resistance to chlorides, they are especially suitable for power plants using seawater desulfurization. The higher the molybdenum content, the better the corrosion resistance, but the more difficult it is to smelt and process. The main performance is the strengthening of the alloy, which affects the application of the alloy to a certain extent. The corrosion resistance of Ti-Mo alloy is shown in Table 2. Titanium molybdenum alloy is more suitable for corrosion protection of steel chimney than pure titanium. Ti-20MO and above titanium molybdenum alloys can meet the requirements, and because they have strong resistance to chlorides, they are especially suitable for power plants using seawater desulfurization. The corrosion resistance of Ti-Mo alloy is shown in Table 2. Titanium molybdenum alloy is more suitable for corrosion protection of steel chimney than pure titanium. Ti-20MO and above titanium molybdenum alloys can meet the requirements, and because they have strong resistance to chlorides, they are especially suitable for power plants using seawater desulfurization. Titanium molybdenum alloy is more suitable for corrosion protection of steel chimney than pure titanium. Ti-20MO and above titanium molybdenum alloys can meet the requirements, and because they have strong resistance to chlorides, they are especially suitable for power plants using seawater desulfurization.

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Notes on installation and transportation of titanium pipes and titanium fittings:

1. Titanium and titanium alloy pipe installation Titanium pipe manufacturers should pay attention not to contact or collide with ferrous materials during transportation and storage of titanium and titanium alloy pipes.

2. Titanium and titanium alloy tubes should be cut by mechanical methods, and the cutting speed should be low. When cutting or repairing titanium tubes with a grinding wheel, special wheels should be used; flame cutting is not allowed. The groove should be machined.

3. Titanium alloy welded pipes shall be welded by inert gas shielded welding or vacuum welding. Oxy-acetylene welding or carbon dioxide gas shielded welding shall not be used. Ordinary manual arc welding shall not be used.

4. Titanium and titanium alloy pipes must not be struck and squeezed with iron tools and materials during installation; rubber plates or soft plastic plates should be inserted between carbon steel supports and hangers and titanium and titanium alloy pipes to make them Not in direct contact with titanium and titanium alloy pipelines; titanium and titanium alloy pipelines should be installed with bushings when passing through walls and floor slabs, the gap should not be less than 10mm, and insulation should be filled, and the insulation should not contain iron impurities.

5. Titanium and titanium alloy pipes should not be directly welded to other metal pipes. When connection is required, a looper flange connection can be used. The non-metal gasket used is generally a rubber or plastic pad, and the chloride ion content should be controlled to not exceed 25ppm

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Background of titanium and alloy materials in marine applications

As we all know, the area of ​​the ocean occupies 70% of the earth's area. The ocean is rich in resources, including marine fish that we consume daily, industrial oil and gas resources, the use of energy contained in alternating seawater tides, and many deep oceans to be detected Creatures and resources in unknown areas. Being able to make good use of the ocean efficiently will be the greatest wealth of mankind. However, in the course of marine development and exploration, the high salinity of seawater, biological pollution, and corrosiveness has caused us a lot of trouble on the planet. The advantages and characteristics of titanium and titanium alloy materials in the marine field have a bright future. come out.

Titanium is a material with excellent physical properties and stable chemical properties. Titanium and its alloys have high strength, low specific gravity, resistance to seawater corrosion and marine atmosphere corrosion, and can well meet the requirements of people in marine engineering applications. After years of efforts by titanium industry professionals and marine engineering application researchers, titanium has been widely used in marine oil and gas development, harbor construction, coastal power stations, desalination, ships, marine fisheries, and marine thermal energy conversion. Nowadays, titanium for marine engineering has become one of the main fields of titanium civil applications.

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TA10 (American Standard Gr12)

TA10 grade titanium has an "excellent" grade due to its high quality solderability. It is a highly durable alloy that provides great strength at high temperatures. TA10 grade titanium has similar characteristics to 300 series stainless steel.
The alloy can be hot or cold formed by pressing, hydroforming, stretch forming or drop weight method. Its ability to form in various ways makes it useful in many applications. The high corrosion resistance of this alloy also makes it invaluable for manufacturing equipment where crevice corrosion is required. TA10 grade can be used in the following industries and applications:
Shell and heat exchanger
Hydrometallurgical applications
High-temperature chemical manufacturing
Shipping and ticket components
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What are the characteristics of molybdenum targets? Molybdenum target purity

Because molybdenum has a high melting point, high electrical conductivity, low specific resistance, and good corrosion resistance and environmental protection, molybdenum targets are widely used in the electronics industry, such as flat panel displays, thin-film solar cells, Wire material, Sifeng Xiaobian will introduce you the characteristics of molybdenum target.

1.High purity

The higher the purity of the molybdenum target, the better the performance of the sputtered film. Generally, the purity of the molybdenum sputtering target needs to be at least 99.95%. However, as the size of glass substrates in the LCD industry continues to increase, the length of wiring and the width of wires have to be reduced. In order to ensure the uniformity of the film and the quality of the wiring, the requirements for the purity of molybdenum sputtering targets have also increased accordingly. Therefore, according to the size of the sputtered glass substrate and the use environment, the purity of the molybdenum sputtering target is required to be 99.99% -99.999% or higher.

2.High density

During the sputtering coating process, when a relatively dense sputtering target is bombarded, a large-sized target particle or particle splashes due to the sudden release of gas existing in the pores inside the target, or the film is subjected to Sub-electron bombardment causes particles to splash, and the presence of these particles will degrade the film quality. In order to reduce the pores in the target solid and improve the film performance, the sputtering target is generally required to have a high density. For molybdenum sputtering targets, the relative density should be above 98%.

3.Grain size

Generally, the molybdenum sputtering target has a polycrystalline structure, and the grain size can be on the order of micrometers to millimeters. Experimental studies have shown that the sputtering rate of fine-grained targets is faster than that of coarse-grained targets, and the thickness distribution of the deposited films is more uniform for targets with smaller grain size differences.

4. Crystallization direction

Because the target atoms are easily sputtered along the direction of the hexagonal close arrangement of atoms during sputtering, in order to achieve the sputtering rate, the sputtering rate is often increased by changing the crystal structure of the target. The crystal orientation of the target also has a large effect on the thickness uniformity of the sputtered film layer. Therefore, obtaining a target structure with a certain crystal orientation is very important for the sputtering process of the thin film.

5, thermal conductivity

Generally, the molybdenum sputtering target must be connected with the oxygen-free copper (or other materials) chassis before sputtering, so that the target and the chassis have good thermal conductivity during the sputtering process. After the binding, the ultrasonic inspection must be performed to ensure that the uncombined area of ​​the two is less than 2%, so as to meet the requirements of high-power sputtering without falling off.

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What are the properties and uses of TC11 titanium alloy rods?

As a stable metal, TC11 titanium alloy rod has the characteristics of high hardness, low density, and good corrosion resistance. Because of these excellent properties of titanium, we will fuse TC11 titanium alloy with other metals to make titanium. Alloy rods not only have the original characteristics of titanium, but also some new characteristics.

TC11 titanium alloy rods have high strength, low density, good mechanical properties, corrosion resistance, high stability and other effects, but the more stable the metal, the more difficult it is to process. Therefore, the process of producing titanium alloy rods is more complicated and the cost is higher. High, so the earliest titanium alloy rods were mainly used in aircraft engine parts, as well as rockets, missile flight parts, etc. In addition, the main application fields of titanium alloy rods are military, scientific research, made of high-strength, corrosion-resistant parts, Very few people can use it.

With the continuous development of technology, the cost of titanium alloy rods has been reduced a lot, and it can be used in industry, construction, and civilian use. The high-quality properties of titanium alloy rods have led to the popularity of titanium products.

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Application of titanium rod, titanium wire and titanium plate in the shipbuilding industry

Nuclear submarines, deep submarines, atomic icebreakers, hydrofoil vessels, hovercraft, and minesweepers use titanium rods, titanium plates, propellers made of titanium wire, submarine whip antennas, seawater pipelines, condensers and heat Switches, acoustic devices, fire fighting equipment, etc. The main applications of titanium alloys are industrial pure titanium, Ti-6Al-4V, Ti-6Al-4VELI, Ti-6Al-2Nb-1Ta-0.8Mo, Ti-3Al-2.5V, and ЛT-3B alloy [Ti- (3.5 ～ 5.0) Al- (1.2 ～ 2.5) V], T-7M [Ti- (1.8 ～ 2.5) Al- (2.0 ～ 3.0) Zr].
In addition, titanium nickel alloys with shape memory characteristics have been used as pipe joints in submarines. This is very practical when using memory alloys as joints in seawater when it is difficult to weld by ordinary methods.
Deep-sea vessels used for mining manganese nodules in the ocean in the United States are prepared to use titanium rods. A deep-sea vessel uses hundreds of Ti-6Al-4V titanium alloy rods to produce large-caliber thick-walled pipes with a thickness of 10mm and a diameter of 250mm. Deep-sea marine pumps for mining manganese nodules are used to salvage seawater with manganese blocks under vacuum pressure. This pump requires resistance to seawater pressure of 5000-6000m deep, and also requires resistance to corrosion and friction. Titanium is suitable for manufacturing such pumps. material.
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