Cold-zinc-spray long-acting anti-corrosive coating

Abstract

The invention discloses a cold-zinc-spray long-acting anti-corrosive coating. The coating comprises the components in a weight ratio: 11%-14% of silicone-grafted polymer, 78%-83% of ultrafine zinc powder and 6%-8% solvent gasoline. Compared with existing similar products, the product, of which the content of metallic zinc in dry paint film is greater than 96%, has the same antirust effect as hot galvanizing and a steel structure is protected from being corroding for 20-25 years in a severe marine-atmosphere environment; the anti-corrosive coating has the advantages of high bonding strength, salt-spray corrosion resistance, single component and convenience in construction and operation and the service life of the steel structure is significantly prolonged.

Description

technical field [0001] The invention relates to a steel structure anticorrosion coating, in particular to a cold-sprayed zinc long-acting anticorrosion coating. Background technique [0002] At present, the anti-corrosion field of steel structures mainly includes zinc cathodic protection, epoxy resin protection, polyurethane protection, etc. Among them, zinc cathodic protection includes hot-dip galvanizing, cold spray zinc, epoxy zinc-rich primer, inorganic zinc-rich primer, etc. In the field of long-term corrosion protection of steel. [0003] Epoxy zinc-rich primers and inorganic zinc-rich primers have a maximum zinc content of more than 84% in the dry paint film, and their effective anti-corrosion life is less than 15 years, which cannot meet the anti-corrosion requirements of more than 20 years. Although the anti-corrosion life of zinc can reach 20 years, the operation requires that the derusted steel be immersed in a zinc solution above 500°C to achieve the purpose of ...

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Problems solved by technology

[0003] Epoxy zinc-rich primers and inorganic zinc-rich primers have a maximum zinc content of more than 84% in the dry paint film, and their effective anti-corrosion life is less than 15 years, which cannot meet the anti-corrosion requirements of more than 20 years. Although the anti-corrosion life of zinc can reach 20 years, the operation requires that the derusted steel be immersed in a zinc solution above 500°C to achieve the purpose of attaching the zinc layer. This method is complicated to operate, and the heating process must A large amount of sewage is produced, resulting in serious environmental pollution, and its technology has been unable to adapt to the continuous development of science and technology, the requirements of environmental protection laws and regulations, and the requirements of human settlements

[0004] Cold spray zinc can be sprayed at room temperature, and the construction is simple. With the ultra-high content of zinc in the dry paint film to protect the steel structure, only a small amount of solvent gasoline volatilizes during the construction process. It is an environmentally friendly paint, but the existing cold spray paint The zinc content in medium is far less than that in hot-dip galvanizing, which is not conducive to long-term anti-corrosion, and the adhesion and salt spray resistance of cold-sprayed zinc coatings are low, which cannot adapt to harsh construction environments

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