Plastic-coated composite anti-corrosion steel pipes are divided into: hot-dipping process, internal and external spraying process, rotomolding process, spray coating process, suction coating process, sintering and winding process, etc.
Hot dipping adopts: fluidized bed dipping, one-time film forming method. Also known as the first generation of plastic-coated steel pipe anti-corrosion, inside and outside polyethylene.
Internal and external spraying process: using electrostatic adsorption theory, through pre-treatment of steel pipe, spraying polyethylene or epoxy resin powder with spray gun. Also known as the second-generation anti-corrosion of plastic-coated steel pipes, internal and external epoxy composite steel pipes.
Flow coating process: also known as the curtain method, it is coated on the outer wall of the heated steel pipe by means of a spray coating method through a sieve filled with powder.
 
This process can produce outer polyethylene inner epoxy composite steel pipe. Also known as the third-generation anti-corrosion of plastic-coated steel pipes.
Sintering and winding process: using the thermal fusion winding method, the hot melt adhesive and polyethylene are wound on the heated steel pipe in the form of an extruder, and react to form a three-layer structure, the full name is sintered epoxy/extruded polyethylene Structural protective layer. as the picture shows:
This process can produce outer three-layer structure polyethylene and inner sintered epoxy composite steel pipe. Also known as the fourth-generation anti-corrosion of plastic-coated steel pipes
 
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