Metal anticorrosive coating for repairing rusted steel

Abstract

The invention discloses metal anticorrosive coating for repairing rusted steel. The coating includes, by mass, 20-24 parts of acrylic acid, 8-12 parts of tannic acid, 4-8 parts of isopropyl alcohol and 1-2 parts of an activating agent. The acrylic acid, the tannic acid and the isopropyl alcohol are adopted as main ingredients of the coating, rust is reduced into a rust-proof deactivated componentthrough composite organic acid groups of polymer, polymer micelles undergo molecular rearrangement on a metal matrix, a film is formed through oxidation, and the film has high sealing performance, high rust removal performance and high adhesive force, thus completely solving the problem of secondary rusting after rust removal and coating.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a metal anticorrosion coating used for repairing corroded steel. Background technique [0002] With the rapid development of modern industry, the anti-corrosion work of steel materials has attracted more and more attention from all aspects. In order to protect steel from corrosion and prolong its service life, anti-corrosion coating on steel is an economical and effective method. [0003] In order to obtain excellent corrosion resistance, the rust on the steel must be removed before painting, otherwise the corrosion effect of the paint film will be poor due to the continuous expansion of the rust. Therefore, rust removal of steel is an important process for painting. It plays a decisive role in the success or failure of anti-corrosion coating. The rust is divided into 3 layers vertically: surface layer floating rust Fe 2 o 3 , middle granular rust FeO n h 2 ...

AI Technical Summary

Problems solved by technology

Due to the limitation of construction conditions, it is difficult to use mechanized construction methods in the maintenance process of many large buildings, bridges, ships and other complex steel structural components. Manual or electric tools can only be used to remove rust, but the quality of rust removal cannot be obtained. Guarantee, difficult construction, huge cost

[0004] At present, the anticorrosion of domestic steel structures still uses the old process of painting after sandblasting, but there are disadvantages in the process such as dead angles of complex structural parts, dust pollution, noise pollution, and high cost.

For this reason, extensive research on rust conversion primers has been carried out at home and abroad, and there are many products that have been commercialized, but most of them have unsatisfactory effects. Simple formulas often use normal temperature phosphating solution, silica sol, organic acid, etc. alone or in combination. Used together, this type of product has poor conversion performance to steel corrosion and poor film-forming ability

In addition, water-soluble resins such as polyvinyl butyraldehyde are selected to be mixed with phosphoric acid and organic acids. The storage stability of this formula is poor, and white precipitates precipitate out after long-term storage. The performance of the resin is poor, and the ability to resist corrosion and ultraviolet rays outdoors is not ideal.

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