[China Aluminum Network] The two-layer FBE coating system consists of a FBE undercoating layer and a modified FBE top coating covering the surface of bare tubes. The coating process of double-layer FBE is basically the same as that of the standard FBE coating process, except that the arrangement of the spray chamber and the spray gun is changed, and no complicated equipment is required. The powder spray chamber spray guns are arranged in two spray chambers and an integral powder spray chamber. Their dusting processes for the two-layer FBE coating system are respectively the double spray chamber spray process and the integral spray chamber spray process.
The performance characteristics of the double-layer FBE coating system have been verified by laboratory tests and field application tests. The double-layer FBE anticorrosion system applied to buried steel pipelines has high bond strength with the substrate, high resistance to cathodic disbondment, and low water absorption. , high temperature performance characteristics. The more remarkable feature of this system is that it combines the high bonding performance of the standard FBE with the substrate and the better water permeability resistance of the modified FBE.
With the introduction of new materials, the welding process at the spot weld seam has been made more selective. A conventional mobile fluidized bed can be used, and the steel pipe is heated on the spot by means of an induction heating device and then spray-bonded to FBE to make up the mouth. It is also possible to adopt the Parrott Pipe anti-corrosion paint produced by Parrot Corporation of the United States and the ATO Super Pottery anti-corrosion paint produced by Korea Jingxing Industry Co., Ltd., and apply the cold coating method at the site. These two kinds of paints have been tested by the company of the pipeline bureau and proved to have high bonding strength with FBE. The performance of the coating is also similar to that of FBE, and the construction is simple and easy. It is the best alternative available at present. material.
In summary, the modified double-layer FBE anti-corrosion system can completely achieve the performance of the three-layer structure coating in performance, and is much simpler than the three-layer structure coating in the application process. According to incomplete statistics, more than a dozen single-layer FBE anticorrosion production lines have been built in the country. With a slight improvement of these production lines, a modified double-layer FBE anticorrosion coating can be produced, which can reduce costs and the performance is not lower than that of the three-layer structure. At the same time, it can also prevent cathodic protection and shielding from happening, which can make the domestic pipeline anticorrosion 1 coating technology reach a new level. Therefore, the modified double-layer FBE anti-corrosion system will have strong competitiveness in steel pipe anti-corrosion projects.