Why should steel pipes anticorrosive?As the name implies, steel pipes anticorrosive is to prevent steel pipes from corrosion and reduce the service life.PE anticorrosive steel pipes are processed and transported pipeline projects such as petroleum, water, and natural gas, will be used as economic transmission materials.Whether it is buried or overhead, it will face this problem. So, how to solve this problem?Later, people invented the outer wall or inner wall of the steel pipe to prevent corrosion to effectively control and prevent steel pipe corrosion.
At present, steel pipe anticorrosive coatings are mainly:
1. Oil coatings
Oil coatings are a coating with dry oil as the main film.It is characterized by convenient production, good painting, good moisture, low price, and flexible paint film;Dry oil is usually combined with anti -rust pigments to form rust -proof paint, which is used in the atmospheric environment and has low corrosion resistance.
2. National painting
National paint, also known as raw lacquer and large paint, is unique to China.Raw paint is a milky white viscous liquid that cuts the bark from the lacquer tree and removes impurities after filtering.After the raw paint is coated after the surface of the object, the color quickly becomes red, from red to purple.If it takes a long time, it can become a hard and bright black paint film.Paint phenol is the main component of raw paint, with 30-70%content (the higher the paint phenol content, the better the raw paint quality).The national lacquer is strong, the paint film is tough, the luster is good, the soil corrosion resistance, water resistance and oil and oil.The disadvantage is toxic and easily cause skin allergies.In addition, it is not resistant to strong oxidant and poor alkali resistance.
3. Phenolic resin paint
It mainly includes alcohol -soluble phenolic resin, modified phenolic resin, and pure phenolic resin.The alcohol -soluble phenolic resin paint has good corrosion resistance, but its disadvantages are inconvenient construction, poor flexibility, and weak adhesion, so its application is limited to a certain degree.Phenolic resin needs to be modified during use.For example, rosin modifiers and phenolic resin and tung oil are refined. Add various pigments. After grinding, various magnetic coatings can be made.The paint film is tough, the price is low, and it is widely used in the painting of furniture and doors and windows.Pure phenolic resin coatings have strong attachment, water resistance, humidity resistance, heat resistance, corrosion resistance, and good weather resistance.
4. Epoxy resin paint
Epoxy coatings have good attachment strength, strong adhesion to metal, concrete, wood, glass and other materials, good alkali resistance, and good insulation performance.The disadvantage is poor aging.Epoxy anticorrosive coatings are usually composed of epoxy resin and curing agent.The nature of curing agent also affects the performance of the paint film.Epoxy resin paint is a single -group coating system based on epoxy resin as a film.Epoxy resin consists of epoxy resin and plant oil fatty acid ester.Compared with ordinary epoxy coatings, the coating has the advantages of low cost and poor alkali resistance.Commonly used in various metal paint and outdoor equipment anticorrosive coatings for chemical plants.
5. Polyurethane paint
Polyurethane resin is used for anticorrosive coatings: two components: isocyanate-NCO and hydroxyl groups.Poly aminotropine (polyurethane) is mixed with dual -components during use and reflects solidification.
Polyurethane coatings have good physical mechanical performance, hard paint film, flexible, bright, full, full, wear resistance, strong adhesion, corrosion resistance, oil resistance, acid, chemical, industrial exhaust gas and other characteristics.The alkali resistance is slightly lower than the epoxy coatings; the aging resistance is better than the epoxy coating, which is often used as facial paint or as a primer paint; polyurethane resin can mix with various resin, which can be widely adjusted to meet various use requirements;Room temperature curing or heating and curing, low temperature (0 ° C) can also be solidified; polykeexate components have poor storage stability, and water must be isolated to avoid frozen.Polyurethane coatings are high in price and long service life.
6.
Adopting a unique embedded lining process, corrosion -resistant materials are formed in the steel pipe.This corrosive material can beolate the oilfield corrosive liquid and gas from the steel pipe to provide an internal anticorrosive lining system for the steel field steel pipe and pipeline.For damaged oil pipes or underwater streamlines, the replacement cost is very high.It can provide good corrosion resistance in a very harsh environment, which is unmatched by other products.
7. Polyethylene, polypropylene resin coating
Polyethylene resin anticorrosive coatings are film coatings made of monomer resin.Polyethylene coatings have been widely produced and applied.
Polyethylene pipeline has strong antiseptic sealing, high mechanical strength, strong waterproofing, stable quality, convenient construction, good applicability, and not polluting the environment.PE low water absorption rate (below 0) .01%), high epoxy strength, low PE water absorption, good hot -melt glue, good softness, high anti -corrosion reliability.The disadvantage is that the cost is higher than other supplementary materials.The coating raw material is rich in sources and has been widely used in corrosion.
8. Fu Fu resin paint
Auous resin coatings are resistant to various non -oxidized inorganic acids, electrolyte solutions, and various organic solvents. The alkali resistance is also very prominent, but the antioxidant is not good.Afu resin series anticorrosive coatings include bran glycol coatings, pyramidonidine formaldehyde coatings and modified 呋 resin coatings.
9. rubber paint
Rubber anticorrosive coatings are made of chemical treatment or mechanical processing of natural rubber or synthetic rubber, adding solvents, fillers, pigments, catalysts, etc.
10. Asphalt paint
Asphalt is one of the important anticorrosive coatings.Especially coal focus asphalt is the best.Coal scorched asphalt coatings are low in price and have the advantages of water resistance.After ten years of soaking in the water, its water absorption rate is only 0.1% -0.2%; the erosion of some chemical media is resistant; it still has good wetability for the non -completely rust -removing steel surface;; Low price.Its disadvantage is that it is crispy in winter and soft in summer.After exposure, some ingredients volatilize and escape can crack the paint film.These disadvantages can be improved by adding other resins.For example, adding chloride rubber can improve the dryness of asphalt coatings and improve the shortcomings of crispy and summer softness; epoxy asphalt coatings made of epoxy resin have the advantages of asphalt coatings and epoxy coatings.Effect.The asphalt coatings have been used for the bottom of the container, the bottom of the ship, the dock gate, coffin, etc., and have good anticorrosive effects.
11. Evaporation of corruption coatings
Heavy anti -corrosion coatings are compared to ordinary anticorrosive coatings.It refers to the anticorrosive coatings that are more than several times higher than ordinary corrosive coatings under severe corrosion conditions.It is characterized by the excellent performance of corrosive media, with outstanding durability, and a life of more than several years.It is mainly used for marine structure and chemical equipment, tanks and pipelines.
