The anti-corrosion insulation pipe is a kind of steel structure. The steel structure has a series of advantages such as high strength, lightweight, good seismic performance, construction speed block, low foundation cost, small occupied area, high degree of industrialization, and beautiful appearance. The steel material is of uniform quality, has good plasticity and resistance, and the steel is close to a homogeneous isotropic body. It has reliable calculation, good weldability, simple production, convenient construction, good installation and impermeability, and is suitable for closed structures. , Good heat resistance, but poor fire resistance.
Anti-corrosion insulation pipes are mainly used in tap water engineering, the petrochemical industry, the chemical industry, the electric power industry, agricultural irrigation, and urban construction, and are one of the twenty products developed in China. For liquid transport: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: for piling pipes, for bridges; for docks, roads, building structures, etc.
Steel pipe anti-corrosion refers to the chemical or electrochemical reaction of the pipeline in the process of pipeline utilization and transportation, which is influenced by the utilization situation and the transport medium to cause corrosion. Plastic-coated steel pipe has a hollow section whose length is much greater than the diameter or circumference of steel.
According to the cross-sectional shape, it is divided into circular, square, rectangular and special-shaped steel pipes; according to the material, it is divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes and composite steel pipes; Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, they are divided into seamless steel pipes and welded steel pipes, of which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) Two types, welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes. In order to effectively prevent or control pipeline corrosion, scientists are seeking a new level of useful methods.
New types of pipeline anti-corrosion skills (skills) are constantly emerging, which can be roughly divided into the following examples:
1. Grease coating – used in atmospheric conditions where corrosion resistance is not high.
Grease coatings are therefore a class of coatings in which drying oil is an important film former. It is characterized by easy production, good brushability, good wettability to the object surface, low price, and flexible paint film; but the paint film is slow to dry, soft film, poor machine performance, acid and alkali resistance ( Refers to the resistance to acid or alkaline water immersion), water resistance and organic solvent resistance. Drying oils are often combined with anti-rust pigments to form anti-rust paints for use in atmospheric conditions where corrosion resistance is not critical.
2. National paint(raw lacquer and lacquer)
Raw lacquer, also known as raw lacquer and lacquer, is one of our specialties. Raw lacquer is a milky white viscous liquid that flows from the bark of a growing sumac tree. It is filtered with a fine cloth to remove impurities. After it is painted on the surface of the object, the color quickly changes from white to red, from red to purple, and for a long time, it can form a solid and bright black paint film.
Urushiol is an important component of raw lacquer, with a content of 30-70%. The use of steel pipes for cement mortar anti-corrosion steel pipes to manufacture highway bridges not only saves steel and simplifies construction, but also greatly reduces the area of the protective layer, saving investment and maintenance costs. As a general rule, the higher the urushiol content, the better the quality of the lacquer.
The national paint has strong adhesion, strong paint film and good light. It is resistant to soil corrosion, and is more resistant to water and oil. The bad part is that it is toxic and easy to cause skin allergies. In addition, it is not resistant to strong oxidants and poor alkali resistance. Nowadays, there are many modified raw lacquer coatings, which overcome the above shortcomings to different levels.
3. Phenolic resin coating
The main ones are alcohol-soluble phenolic resin, modified phenolic resin, pure phenolic resin, etc. 3PE anti-corrosion steel pipe is made of a single piece of metal without seams on the surface, which is called seamless steel pipe. According to the production method, seamless pipes are divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, and pipe jacking. Alcohol-soluble phenolic resin coatings have good anti-corrosion performance, but inconvenient construction, poor flexibility and adhesion, and their applications are definitely limited. Therefore, phenolic resins are often modified. For example, rosin-modified phenolic resin and tung oil are refined, and various pigments are added, and various enamels can be obtained by grinding. Pure phenolic resin coating has strong adhesion, water resistance, humidity resistance, corrosion resistance and good weather resistance.