Single-layer epoxy powder (FBE) on the outer surface of bends, double-layer epoxy powder (2FBE) on the outer surface, and internal epoxy resin anti-corrosion coating.
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FBE/2FBE Epoxy Powder Coated Bend Pipes for External Corrosion Protection: Production and Processing Range: φDN80 – ΦDN1400
Epoxy-resin internal anti-corrosion elbows: Production and processing range φDN80–ΦDN1800
Fusion-bonded epoxy powder external coating + epoxy resin internal anti-corrosion
Fusion-bonded epoxy (FBE) powder external coatings—also known as 2FBE—are a new type of anti-corrosion coating that has been developed over the past three decades. FBE coatings come in two types: single-layer and double-layer. The term "FBE coating" typically refers to the single-layer fusion-bonded epoxy coating. The single-layer FBE coating uses a specialized fusion-bonded epoxy powder coating as its film-forming material. This epoxy powder coating is applied via electrostatic spraying, forming a single-coat film in one step. This epoxy powder coating is a thermosetting material, produced by mixing and grinding solid epoxy resin, curing agents, and various additives. Before painting, bent pipes undergo shot blasting and intermediate-frequency preheating. Then, using an electrostatic spraying method, the epoxy powder coating is applied onto the heated surface of the bent pipe, where it melts and bonds firmly to the pipe surface, subsequently curing to form a protective coating. Generally, FBE coatings have a single-coat film structure. FBE coatings offer numerous advantages, including strong adhesion to steel, excellent film integrity, resistance to cathodic disbondment, resistance to soil stress and abrasion, simple application procedures, zero pollution, superior impact and flexural resistance, and high temperature resistance. As a result, they have been widely adopted abroad. FBE coatings can be used for external corrosion protection of steel underground pipelines or underwater pipeline facilities operating at temperatures ranging from -30°C to 100°C.
A coating formulated by using epoxy resin as the film-forming substance and incorporating a certain amount of pigments, fillers, additives, solvents, and other components is referred to as an epoxy resin anti-corrosion coating. Due to the presence of highly polar hydroxyl groups and ether linkages in the molecular structure of epoxy resin, the resulting coating exhibits excellent chemical resistance, outstanding alkali resistance, and even better resistance to hot alkaline media. Moreover, since its structure features alternating arrangements of rigid benzene rings and aliphatic hydrocarbon chains with terminal functional groups, the coating also demonstrates remarkably good physical and mechanical properties. The presence of polar functional groups imparts a certain degree of hydrophilicity to the coating; however, with proper formulation selection, coatings with excellent water resistance can also be obtained. There are many varieties of epoxy resin anti-corrosion coatings available, among which amine-based or their derivative-cured epoxy coatings and asphalt-epoxy anti-corrosion coatings are widely used. In recent years, solvent-free epoxy resin anti-corrosion coatings have begun to find application, and water-emulsion-type epoxy resin anti-corrosion coatings hold great promise for future development.
After curing, it exhibits excellent mechanical properties, chemical resistance, superior electrical performance, and outstanding thermal stability.
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