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Titanium Pipe Performance
The seawater of the coastal power station uses the sea water as the cooling water, Titanium Pipe because the seawater contains a lot of sediment, suspended matter, Titanium Pipe marine life and various corrosive substances in the seawater and river water alternately change the situation of the more severe salt water. Conventional use of copper alloy tube corrosion methods are: comprehensive corrosion (uniform corrosion), Titanium Pipe erosion, erosion and stress corrosion. Because titanium has excellent corrosion resistance, Titanium Pipe so the titanium tube condensers due to corrosion caused by seawater leakage accident has been eliminated, Titanium Pipe but because of the good corrosion resistance of titanium tube, unlike the copper alloy tube as a surface containing Therefore, Titanium Pipe it is necessary to have a corresponding cleaning device. Therefore, it is necessary to have a corresponding cleaning device.
Although the titanium surface has a dense passivation film, in many strong corrosive medium is very resistant to corrosion, but because of the great affinity of titanium and hydrogen. Titanium Pipe Very easy to absorb hydrogen. At room temperature occurs, high temperature (such as 100 ℃) hydrogen absorption quickly. Hydrogen in the titanium in the fixed melting limit is very small (about 20ppm), more than the limit will be in the titanium surface precipitation of hydride (TtH2). As the surface TiH2 increases, the impact value and elongation of titanium are rapidly reduced by 4J. In addition, in the transformation of the old unit, because the tube plate is copper alloy, Titanium Pipe condenser tube with titanium, which requires the use of cathodic protection device to prevent electrochemical corrosion such as Hitachi's power plant condenser with seawater cooling, titanium tube and copper alloy Plate composition of the galvanic, when the protection potential is less than a 0.75 v (ScE) so that the export of titanium tube end of hydrogen absorption, the use of hydrogen content of 650ppm a year; Titanium Pipe if the potential selection of a 0.5 ~ O.75 v (scE) Titanium will not occur hydrogen absorption. "
As the corrosion resistance of titanium tube is good. Titanium condensers are not damaged by corrosion, but the titanium tube may be damaged due to vibration. To avoid the vibration problem of the titanium tube, it is necessary to determine the spacing of the spacer ; In the transformation of the old unit, Titanium Pipe you have to examine the original partition spacing is applicable to titanium tube.
Titanium is a very lively metal whose equilibrium potential is very low and the thermodynamic corrosion tends to be large in the medium. But in fact titanium is stable in many media, such as titanium in the oxidation, neutral and weak reductive and other media is corrosion-resistant. Titanium Pipe This is because titanium and oxygen have a lot of affinity, in the air or oxygen-containing medium, the titanium surface to generate a layer of dense, strong adhesion, Titanium Pipe inert oxide film to protect the titanium matrix is not corroded. Even if the mechanical wear will soon be self-healing or re-regeneration. This indicates that titanium is a metal with a strong passivation tendency. Titanium Pipe The dielectric film temperature of 315 ℃ below the titanium oxide film always maintain this feature.
Although the thermal conductivity of metallic titanium is lower than that of carbon steel and copper, the wall thickness can be greatly reduced due to the excellent corrosion resistance of titanium, and the heat transfer method of surface and steam is droplet condensation, Titanium Pipe which reduces the heat and too surface Non-scaling can also reduce the thermal resistance, so that the titanium heat transfer performance significantly improved.
Titanium heat exchanger with a variety of fine properties of industrial titanium, widely used in various types of seafood farming, sea water heat exchange, Titanium Pipe salt water heat, chemical, food, medicine, metallurgy, refrigeration, light industry, electroplating industry, Salt, paper, ultrasonic, electronic communications, Titanium Pipe central heating and other industries and fields.
Titanium in the welding of the welding area is prone to oxidation, Titanium Pipe weld stomata, cold cracks and other quality problems, this paper lists the specific and feasible effective preventive measures.