Pipeline wear-resistant materials and corrosion resistant nanocomposite coating of polyurea

 1 channel composite corrosion resistant material classification

    Pipeline corrosion resistant composite materials can be divided into organic and inorganic composite materials, corrosion resistant composite corrosion resistant materials. Each has its advantages and disadvantages, are described below.

    Corrosion resistant materials, organic compound 1.1

    1.1.1 wear and corrosion repair glue

    It is a polymer matrix, within the mixed hard wear and corrosion particles and toughened fiber, and the composition of the modifier with catalytic two-component material. Iron and steel, ceramics, cement, etc. are excellent bond strength, with abrasive erosion wear resistance, corrosion and other media features. Construction is simple, vertical or ceiling can be coated on the work surface, non-flowing, non-polluting, particularly suitable for large-scale repair and pre-corrosion wear protection lining and so on. Wear and corrosion repair glue can be used in thermal power plants grind coal and ash handling system, such as coarse, fine cyclone, a coal duct, elbow, flue, row spiral powder machine, ball mill exports, ash slag systems. Also be used as mining, petrochemical, and various wear corrosion resistance tank, tanks, reactors and other face of the liner.

    1.1.2 rubber lined pipe

    Rubber lined steel pipe used as matrix management, excellent performance elastomers to rubber lining layer, the use of "softness" in principle, reduce the transport impact of media on the wall wear. Good corrosion resistance rubber lined pipe can be used for electric power, metallurgy, chemical industry, petroleum, coal, cement and other industries, transport temperature -30 ~ 150 ℃ between there corrosive wear of both media. Features are as follows:

    (1) The wear resistance and long service life, wear resistance is 10 times more than ordinary steel, the service life of up to 20 years (theoretical value);

    (2) anti-corrosion performance;

    (3) adaptability: the film is soft uncured state, applicable to a variety of shapes pipe lining, rubber to metal bond strength. http://www.prmindustry.com/Abstract...Articles section 1.1.3 Steel-plastic composite pipe

    Steel-plastic composite pipe made of high quality steel tube base to excellent chemical stability, with corrosion resistance, heat resistance of polyethylene (PE) and polypropylene (PP, PO) for the diffusion layer (lining layer), widely used in power , environmental, chemical, metallurgy, coal, paper, food and other industries, is an ideal corrosion-resistant pipe.

    Features are as follows:

    (1) plastic composite pipe implementation HG20538-92 standard, the implementation of the matrix pipe GB8163-1999 standard;

    (2) Working medium temperature -10 ~ 80 ℃;

    (3) The total project cost is low compared to other anti-corrosion pipeline total project cost by 15% to 20%;

    (4) non-toxic, non-polluting, can be used for beverage, food, pharmaceutical, water and other industries.

    1.2 inorganic composite materials, corrosion resistant
1.2.1 Tortoise Shell Mesh lining

    Tortoise Shell Mesh lining product is the matrix of steel pipe, special steel and aluminum wire with a framework, the choice of super abrasion-resistant material for the casting material, made by a special processing technology and a new wear-resistant, high temperature corrosion composite products. Features are as follows:

    (1) Material composition: alumina, silicon carbide, silica, magnesia and other 10 types of wear-resistant high-temperature powder, to be boric acid, sodium silicate and other materials to do bonding agent, a mixture;

    (2) mechanical properties: the lining hardness HV1100-1200, crushing strength of 360MPa.

    Widely used in metallurgy, electric power, cement industries, such as gas pipelines, pipeline dust, ash bucket, cement hopper systems, its wear resistance has been recognized.

    1.2.2 The ceramic-lined steel pipe

    Ceramic pipe with the traditional steel, wear-resistant alloy steel pipe, cast stone and steel plastic pipe, steel rubber tubes with substantially different. Ceramic steel outer tube, inner layer is corundum. Vickers hardness of corundum layer: 1100 - 1500 (Rockwell) hardness of 90 to 98, the equivalent of tungsten-cobalt hard gold. Wear resistance than carbon steel pipe is 20 times more than the usual bond made of corundum grinding wheel performance is much superior.

    Features are as follows:

    (1) The wear resistance of ceramic-lined steel pipe inner corundum ceramics, Mohs hardness of 9.0, equivalent to HRC90 or more, so the electricity, coal, metallurgy, mining the transmission medium has a high abrasion resistance ;

    (2) ceramic-lined steel pipe in the temperature range of -50 ~ 900 ℃ within the long run, the material thermal expansion coefficient (6 ~ 8) × 10-6 / ℃;

    (3) The running resistance loss;

    (4) The project cost is low;

    (5) easy installation and construction.

    In addition to ceramic-lined steel pipe used in coal-fired power plant ash, slag control, powder feeding, back to the powder tube, but also widely used in mining, metallurgy and other industries.

    1.2.3 Auto-igniting ceramic composite steel pipe

    Self-igniting ceramic composite steel pipe, using high-tech production process - from igniting temperature synthesis centrifugal manufacturing. The pipe from the inside out by alumina ceramic layer, transition layer, pipe layer composition. Ceramic layer is in a high temperature above 2200 ℃ instantaneous formation of dense corundum blasting porcelain (Al2O3), through the transition layer to form a strong combination with the pipe. Features:

    (1) The wear resistance: Ceramic lining layer composite pipe as corundum ceramic (a-Al2O3 below), Mohs hardness of up to 9.0, the equivalent of HRC90 or more. Therefore, the transport of various industries, the grinding medium have high wear resistance. Confirmed by the industrial operation: its hardened steel wear life is ten times or even several times;

    (2) running resistance: Ceramic composite pipe of as superior to any smooth surface inside the metal pipe, water resistance coefficient 0.0193, slightly lower than seamless;

    (3) corrosion-resistant, anti-fouling: Because the tube ceramic layer (a-Al2O3), is a neutral substance. So with acid and corrosion resistance of, and also has anti-scaling performance;

    (4) heat resistance and good thermal shock resistance: Since the alumina ceramic (a-Al2O3) is a single stable crystalline organization, composite pipe can be -5 ~ 700 ℃ temperature range of long-term normal operation. Material coefficient of linear expansion (6 ~ 8) × 10-6 / ℃, about pipe 1 / 2. It has good thermal stability;
(5) project cost is low: light weight ceramic composite pipes, affordable. Than the diameter of cast stone pipe with light weight 35% to 50%;

    (6) easy installation and construction: Due to the quality of the light pipe, and welding performance, so can be welded, flanged, quick links, etc., construction and installation convenience, and can reduce installation costs.

    Steel composite pipe full of high strength, toughness, impact resistance, good welding performance and corundum ceramic high hardness, high wear resistance, corrosion resistance, heat resistance and good, is conveying particulate materials, grinding, corrosive media, etc. ideal for wear and corrosion of pipes, can be widely used in metallurgy, mining, electric power, petrochemical and other industries.

    Wear-resistant pipe welding cassette 1.24 points

    Point is pipe welding cassette with high temperature resistant ceramic adhesive strength to the middle hole of the alumina ceramic paste in the pipe wall, in conjunction with the ceramic welding process through the holes firmly welded to the pipe wall. To protect the solder joints, screw on top of ceramic blocks. Each ceramic insert each pressure not only each other, and each porcelain form trapezoidal angle of the close connection between the ceramic blocks, seamless; when embedded in a circle close after the last one, between the ceramic pieces of machinery from 360 ° locking force (this technique in a few centuries ago) has been used in China on a bridge construction project). The production process is relatively complex products, the production cycle is longer, more costly. One piece is the overall after firing ceramic pipe, with a special filler be poured inside the steel pipe assembled. The pipe wall is smooth, sealing, and has good wear and corrosion resistance. Widely used in high temperature (above 300 ℃, the long-term condition) delivery systems, such as power plants and pipelines milling dynamic powder feeding system to run equipment, anti-erosion, abrasion, firmly fixed. __

    Wear-resistant ceramic lined pipe patch 1.2.5

    SMD ceramic pipe is high temperature resistant adhesive strength alumina ceramic paste in the pipe wall, the heat-curing to form a solid wear layer. The production process is relatively simple products, the production cycle is short, relatively low cost. Widely used in systems such as power and steel dust and fly ash conveying system at 250 ℃ wear any of the following conditions apply.

    (2) corrosion resistant nanocomposite material polyurea

    Advantages and disadvantages of conventional corrosion resistant materials, more obvious, while the nano-composite resistant polyurea materials and traditional materials, the performance is more superior, more consistent standards, can achieve the perfect fit. Shi Peng from Shanghai Science and Technology Development Co., Ltd. developed polyurethane made of wear-resistant, corrosion-resistant materials - new nano-composite resistant, anti-corrosion coating materials, organic and inorganic is a wear-resistant, corrosion-resistant materials as one of the advantages of a new type of resistance wear anti-corrosion materials. The material consists of polyurea and the combination of nanoscale powder made of sand. Its characteristics are:

    First, the new material has good wear resistance, abrasion value of approximately 0.003g (750g/500r), almost negligible, is eight times the rubber lining. At -50 ~ 150 ℃ for the medium temperature range applications. New materials with low density elastomers, has good vibration absorption performance and excellent resistance to mechanical shock resistance; good oil resistance, solvent resistance, high mechanical properties and excellent wear resistance.

    Second, the new material all the characteristics of both Polyurea, another inorganic or metal of similar hardness. It combines the advantages of two materials, but also has light weight, less able to achieve the best characteristics of the investment is relatively low. Construction and can easily maximize the savings in raw material; produce less waste, to achieve the best combination; play a role in environment protection and energy, has brought considerable practical interest.

    Third, the new materials can be on-site use, convenient construction, in any cross-section construction, and construction time is short, rapid solidification, high strength, impact resistance, good performance, high flexibility, with other anti-corrosion, wear-resistant material does not have wear resistance.

 Corrosion and wear resistance of new material compared to traditional materials, has the following characteristics:

    (1) and organic materials - rubber as a lining of corrosion, wear-resistant materials, new materials not only has the softness, as well as a higher hardness, the hardness of it with almost the same alloy as the lining material; strong anti-aging properties of new materials, and poor aging resistance rubber lining, leading to increased material costs and losses on the application; new materials of construction is extremely convenient, and rubber require a complex process in order to ultimately achieve the desired effect, time-consuming and costly .

    (2) and inorganic materials - steel and ceramic corrosion resistant materials, new material hardness lower than they are, but no new material has the flexibility of the steel, the impact has played a strong buffer role, and thus more wear resistance; be worn in the new alloy and ceramic materials are also not easy to repair of; new material there is an important feature, light weight, rather than less heavy steel and ceramic not conducive to construction, so you can save a lot of energy, and now the whole world to focus on advocacy materials on energy saving applications, this material just to meet this requirement. However, this new material as steel and ceramic high-temperature resistance, high temperature can not exceed 150 ℃. In addition, the acid concentration should not exceed 20%.

    3 Conclusion

    In summary polyurea powder and nano-ore combination of this new anti-corrosion, wear-resistant materials - corrosion resistant nano-coating, which combines the polyurea materials and nano-fine ore powder properties, the application can achieve the effect of more significant. Overall, the advantages of integrated performance of new materials is the traditional corrosion resistant materials under certain conditions, can not match; to achieve the effect of traditional materials can not emulate. Use it as anti-corrosion, wear-resistant materials, has broad application prospects.

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 Peter  Huang