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The powder coating is solvent-free and has nearly 100% utilization rate. It is highly efficient, environmentally friendly, energy-saving and economical. Its coating has excellent physical and mechanical properties and weathering and corrosion resistance. It has achieved rapid development in the world in the past 20 years. . At present, there has been no publicly reported that an epoxy resin powder coating containing a sheet material is used as a sealing layer of a thermal sprayed metal coating, and that a decorative and protective effect thermosetting powder coating is used as an outer layer.
The composite coating of the metal surface corrosion protection invented by ZENITHCOAT Lu Dongfang, Yuan Jian, and Yan Bing, etc., is tightly bonded on the metal surface and covered with a composite composed of a bottom layer, an intermediate layer, and an outer layer. The bottom layer of the coating and composite coating is a thermal spraying metal layer, the middle layer is a spray layer of an epoxy powder coating, and the outer layer is a spray layer of a thermosetting powder coating.
The effective effect of the composite coating is that: the thermal sprayed metal layer has good anti-corrosion protection capabilities, and a single metal thermal spray layer, two or more metal alloy layers, multiple metal singles can be selected according to the protection requirements of the metal substrate. Thermally sprayed layers of superimposed composite coatings, fully utilizing the anodic protection of active metals or excellent corrosion protection of various metal alloys, using epoxy powder coating with low viscosity and filling in some sheet materials as the sealing layer, When heated and cured, the melted powder coating can quickly infiltrate into the voids of the thermal sprayed layer to obtain a good sealing effect, among which the sheet material (such as inert mica powder, flake oxide salt filler and active flake Metal materials such as zinc flakes, aluminum flakes and other alloy flakes not only increase the density of the coating, but also provide excellent shielding, preventing or even blocking the lines of corrosive media. When active metal flakes are used, they can also consume corrosion. The medium can also use the corrosion products to further block the penetration of the corrosive medium; the outer layer can use decorative or functional thermosetting properties according to the protection requirements. Finished coating, added UV absorbers, antioxidants, polytetrafluoroethylene, glass fiber, flake pigments, nanomaterials, respectively, can play against sunlight, anti-aging, hardened wear, corrosion or coating The role of self-cleaning layer, so that the outer coating has excellent physical and mechanical properties and weathering and anti-aging properties, to achieve the unity of decoration and protection.
The method of applying corrosion protection to the metal surface by using coating technology has been a long time. Various types of coatings, metal thermal spray coatings, and organic coating coatings have achieved good protection effects. Compared with iron, zinc, molybdenum, etc. are all very active metals. The use of thermal spray zinc, molybdenum or their alloys to form a metal coating can provide good protection for copper and iron metals, but the metal coating formed by metal thermal spraying is The molten metal is atomized into particles of 4 to 40 μm in size and adheres to the surface of the copper-iron substrate. The coating structure is relatively loose, and the corrosive medium can be easily penetrated into the steel substrate to form corrosion. The surface must be sealed with a coating material. Closed treatment. At present, closed materials generally use liquid coatings or various types of paints. In practical applications, especially in harsh corrosive environments, many steel components that are processed by the above processes can still corrode through the outer closed layers and erode to the metal quickly. Substrate, in addition to liquid paint or all kinds of paint also have more or less environmental pollution, its high construction costs, coating quality is not easy to guarantee.