Common anti-corrosion steel pipe anti-corrosion process
Anti-corrosion steel pipe refers to steel pipes that have been processed by anti-corrosion technology, which can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reactions during transportation and use. However, we still don’t know all kinds of anti-corrosion steel pipe anti-corrosion methods and processes.
Anti-corrosion steel pipe refers to steel pipes that have been processed by anti-corrosion technology, which can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reactions during transportation and use. However, we still don’t know all kinds of anti-corrosion steel pipe anti-corrosion methods and processes. For 2PE/3PE anti-corrosion, 2PP/3PP anti-corrosion, buried fire-fighting pipeline anti-corrosion, steel-plastic composite pipe anti-corrosion, underground pipeline reinforced anti-corrosion, epoxy coal anti-corrosion Steel pipe anti-corrosion, PE anti-corrosion steel pipe anti-corrosion and several common anti-corrosion are introduced.
1. 2PE/3PE anti-corrosion method:
The bottom layer of the three-layer PE is epoxy paint, the middle layer is polymer adhesive, and the surface layer is polyolefin. Adhesives can use modified polyolefins, which contain polar groups grafted to the main chain of polyolefin carbon bonds. In this way, the adhesive can not only blend with the surface unmodified polyolefin, but also use the polar group to react with the epoxy resin. This combination is characterized by optimum bond strength between the three coatings, while the properties and characteristics of the individual layers complement each other. It is characterized by high cost and complicated process.
The first layer of epoxy powder (FBE>100um) (epoxy powder >100um refers to greater than 100 microns)
The second layer of adhesive (AD) 170～250um
The third layer of polyethylene (PE) is 2.5-3.7mm. The three materials are integrated and firmly combined with the steel pipe to form an excellent anti-corrosion layer.
The 3PE anti-corrosion layer organically combines the anti-corrosion performance of fusion-bonded epoxy powder with the mechanical scratch protection performance of polyethylene, and at the same time solves the market problem of polyethylene. Due to the poor adhesion of the hot melt adhesive, the peeled polyethylene has a shielding effect on cathodic protection. The 3PE anti-corrosion layer has high requirements on the surface treatment state of the pipe, and the depth of the anchor pattern should reach 50 μm to 75 μm, otherwise it will affect the ability of the anti-cathode stripping and waterproof penetration of the anti-corrosion layer.