Coating technology has been used for a long time to protect metal surface from corrosion, such as various coatings, metal thermal spraying coatings, organic coatings and so on, which have achieved good protection effect. Compared with iron, zinc and molybdenum are highly active metals The metal coating formed by thermal spraying of zinc, molybdenum or their alloys can provide good protection for copper and iron metals. However, the metal coating formed by thermal spraying of metals is adhered to the surface of copper and iron substrates by atomizing molten metals Into the 440 micron particles. The structure of the coating is loose and the corrosion medium can easily infiltrate into the surface. The iron and steel substrates are corroded, and their surfaces must be sealed with sealed coatings. At present, sealing materials generally use liquid Coatings or various paints. In practical applications, especially in the harsh corrosive environment, many steel components processed by the above proc In addition, liquid coatings or various paints also have more or less environmental pollution, and their construction costs are high, and the quality of coatings is not high. Easy to guarantee .
Powder coatings do not contain solvents, have nearly 100% utilization rate, high efficiency, environmental protection, energy saving and economy. Their coatings have excellent physical and mechanical properties, weather resistance and corrosion resistance, and have made rapid development in the world in the At present, there is no public report on the technical design of epoxy resin powder coatings with flake materials as the sealing layer of thermal spraying metal coatings and thermosetting powder coatings with decorative and protective functions as the outer layer.
The composite coatings for corrosion protection of the metal surface invented by ZENITHCOAT, Lu Dongfang, Yuan Jian and Chao Bing are closely bonded to cover the metal surface with a composite coating consisting of a bottom layer, an intermediate layer and an outer layer. The layer of the composite coatings is a thermal spraying metal layer, an epoxy powder coating spraying plastic layer in the middle layer and a thermosetting powder coating spraying plastic layer in the outer layer.
The effective effect of the composite coating is that the thermal spraying metal layer has good anticorrosion protection ability, and the superimposed composite coating of single metal thermal spraying coating, alloy layer of two or more metals and single thermal spraying coating of multiple metals can be selected Correspond to the protection needs of metal substrates, so as to make full use of the anodic protection of active metals or excellent anticorrosion resistance of various metal alloys. Corrosion protection performance: epoxy powder coatings with low viscosity and some flaky materials are used as sealing layer When cured by heating, the melted powder coatings can rapidly infiltrate into the voids of thermal spraying coatings and obtain good sealing effect. Among them, flaky materials (such as inert mica powder, flaky oxide salt fillers and active flaky metal materials such as zinc , aluminium and others) can be obtained. Alloy sheet) not only improves the density of coating, but The plays an excellent shielding role, preventing or even blocking the lines of corrosive media. When using active metal sheet, it can also consume corrosive media and use corrosive products to further block the penetration of corrosive media. The outer layer can adopt decorative or functional Absorber, antioxidant, polytetrachloroethylene, glass fiber, flake pigments and fillers, nano-materials can play the role of sunlight resistance, aging resistance, hardening and wear resistance, Corrosion resistance or coating self-cleaning, so that the external coating has excellent physical and mechanical properties and weathering and aging resistance, and achieve the unity of decoration and protection.
