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• W2182454631 abstract "The aim of this paper is to perform a microscopic analysis of the state of the sheet metal after the load in corrosive environment. As an experimental material metal sheets intended for laboratory tests are used, on which to the new surface pre-treatment based on nanotechnology before painting were applied. The sheets will be exposed to corrosive environment in several time periods. The change in the properties of the lacquered layer depending on the time of corrosive action will be monitored. Based on the outcome conclusions and recommendations for manufacturers of coated sheets will be elaborated. To achieve the long-term durability of engineering products surface treatments and surface pre- treatments are used. Surface pre-treatments are intended to remove dirt from the surface of the base material and to the creation of suitable surface for applying and good adhesion of the final coating. Surface pre-treatments can be divided into mechanical and chemical. Mechanical pre-treatment used in the area of lacquering is mainly sanding and blasting. Chemical pre-treatments most often are used in degreasing solvents and organic phosphating. Phosphating is a considerably commonly used method, however, at present by legislation on environmental protection pressure is exerted to restrict the use of hexavalent chromium, reduce heavy metals and improve the quality of wastewater discharged from manufacturing companies. Modern chemical surface pre-treatments based on nanotechnology attempt to eliminate these undesirable impacts on the environment. These are nanopassivating layers, which could in the future replace conventional phosphating processes. These nanolayers are able to provide good conditions for adhesion between the coating layer and the base material similar to phosphating, increase productivity and are environmentally friendly. The bases of these nanoproducts are highly reactive silanes, which create during the reaction with the surface of the material a chemical bond. These silanes create a highly cross-linked inorganic layer on the surface of material having a thickness of 50-100 nm. Thanks to this layer formed at the surface of the material the barrier effect is increasing the corrosion resistance of the material especially in combination with the subsequent powder coating. Inorganic layer is defined as a highly crosslinked film firmly anchored to the surface material by chemical bonds Si - O - M (M-basic material). The film, which arises on the surface of the material, has a homogeneous structure and a thickness in the range of 50 to 100 nm. Nanopassivating product ZircaSil ® is multimetallic and therefore can be used for pre-treatment of Fe materials, galvanized materials and aluminum materials. The corrosion resistance of these coatings is comparable with the technology of phosphating (2). The aim of this paper is to analyze the behavior of the experimental samples after corrosion load, for which a nanopassivating layer was used for the pre-treatment of the surface before applying the powder coating. The samples were burdened in the corrosion chamber for 480, 720 and 1000 hours. After removal from the corrosion chamber the samples were evaluated according to the standards CSN EN ISO below. For samples microstructural analysis was also performed at which the surface quality of basic material of the applied powder coating was evaluated and the surface roughness of the base material was measured before applying the paint. After performing all tests and analyzes conclusions" @default.
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• W2182454631 date "2013-01-01" @default.
• W2182454631 modified "2023-09-27" @default.
• W2182454631 title "ANALYSIS OF STATE OF LACQUERED LAYER OF METAL SHEET AFTER CORROSION LOAD" @default.
• W2182454631 hasPublicationYear "2013" @default.
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