Coating refers to the material used on metal surfaces, which has the function of corrosion protection. The coating with anti-corrosion function can be divided into metal coating (galvanized layer, aluminum plating layer, iron, and steel phosphating layer/oxidation layer); Organic coatings (paint, rubber, and plastic); Inorganic coating (glass, ceramic, concrete); Composite coating (metal coating + organic coating, organic coating + organic coating, organic coating + inorganic coating).

In general, buried pipelines adopt organic coating or organic composite coating, while underwater pipelines usually adopt organic coating combined with a concrete coating. The main function of the concrete coating is to counterweight the pipeline to overcome the influence of water buoyancy.

For buried pipelines, generally, only the outer surface of the anticorrosive coating is. At present, there are four main types of anticorrosive coatings used for buried pipelines: asphalt, film epoxy, polyolefin, and composite coatings.

Pipeline asphalt coatings include petroleum asphalt and coal tar enamel. This kind of coating is a thermoplastic material, which is coated by hot casting. It is generally reinforced by glass cloth or glass fiber felt, and the coating is thick (2.4 ~ 7 mm). Most of the pipelines built before the mid-1980s were coated with petroleum bitumen.

Film epoxy coating is the most widely used coating type at present. With epoxy resin as the main raw material, it can be used as a corrosion-prevention coating for pipelines alone, or as primer combined with polyolefin. There are two forms of powder epoxy and liquid epoxy. The thickness of the single-layer epoxy coating is generally 300 to 500 microns, while the thickness of the composite coating primer is generally 60 to 80 microns.

Polyolefin coating is a widely used anti-corrosion coating material for pipelines in recent decades, mainly polyethylene. At present, most polyolefin products are used as a part of composite coating structures in combination with other materials. The polyolefin products used as an anti-corrosion coating for buried pipelines are mainly polyethylene adhesive tape, which is made of polyethylene film as the base material and compounded with a layer of adhesive, with a thickness of about 1mm.

Coal tar enamel anticorrosive coated steel pipe:

Composite coating of pipeline refers to the combination of single coating materials with various characteristics through simple physical superposition or chemical bonding to form a multi-layer coating system with good comprehensive performance, including two layers of polyethylene/polypropylene, three layers of polyethylene/polypropylene, foam jacket anticorrosive insulation structure, double-layer powder, etc. At present, the commonly used composite coating in China is the three-layer coating, which is composed of fused epoxy powder primer, adhesive intermediate layer and polyethylene outer layer.

Most of the metal storage tanks are aboveground tanks, and the coating on the surface of the tank should have good weather resistance in addition to anti-corrosion performance. Commonly used coatings are chlorosulfonated polyethylene, chlorinated rubber, high vinyl chloride, acrylic resin, polyurethane, etc. In recent years, outdoor structure coating at home and abroad tends to use composite coating structures, such as epoxy zinc-rich primer + high solid epoxy intermediate paint + polyurethane/acrylic top paint.

At present, the commonly used oil storage tank inner coating (lining) materials in the domestic market include film coating such as anti-static, heavy coating such as glass flake, glass steel lining, and so on.

Cangzhou shenlong pipe manufacturing co., ltd. Is engaged in oil, gas, water, coal slurry mixing medium steel pipeline coating operations, anti-corrosion, insulation, piping is set in a body's specialized pipeline engineering precast construction enterprises, products used in an oil pipeline, chemical piping, electrical, pipe, gas pipe, heat pipes, sewage pipes, etc. Anti-corrosion processing of straight pipe and bend pipe DN40-3000 three-layer structure polyolefin (PE, PP, TPEP,3LPE) steel pipe coated with anti-corrosion, DN40-3800 steel hot stewed bend pipe and pipe fittings coated with FBE, epoxy resin coating anti-corrosion, DN40-3800 steel pipe inner wall resistance reduction, solvent-free epoxy steel pipe, epoxy paint anti-corrosion, Coated plastic steel pipe, dip plastic steel pipe. They are lined with plastic steel pipe PE, PO, PP, PTFE, HDPE, and polymer polyethylene corrosion. The company is in strict accordance with China Petroleum and Natural Gas SY/T0413-2002, national GB/T23257-2009, German DIN 30670, American AWWA C210, and other international and domestic anti-corrosion standards.