Metal anticorrosive coating and preparation method and application thereof

Abstract

The invention discloses a metal anticorrosive coating. The coating is an inorganic coating for metal anticorrosion. The coating is of a double-layer structure, and comprises an enamel coating on the outer layer and a matrix oxide coating on the inner layer. At the same time, the content of matrix metal oxide is decreased progressively from the inner layer to the outer layer, and therefore it is caused that the thermal expansion coefficient of the coating is increased progressively from the inner layer to the outer layer, and it is guaranteed that the overall thermal expansion coefficient of the coating is coherent with various matrix metals. The components of the enamel coating on the outer layer comprise, by weight, 1-40 parts of silicon, 1-30 parts of sodium, 1-20 parts of potassium, 2-20 parts calcium, 0.5-15 parts of fluorine, 0.3-10 parts of cobalt, 0.2-10 parts of nickel, 1-18 parts of boron, 0.5-10 parts of phosphorus, 0.1-8 parts of magnesium and the balance oxygen. The components of the matrix oxide coating on the inner layer comprise matrix metal and oxygen. The invention further discloses a preparation process of the double-layer compact metal anticorrosive coating formed by low-temperature sintering. The preparation process includes the following steps of (1) grinding; (2) mixed material preparing; (3) grinding; (4) high-temperature reaction; (5) grinding; (6) coating and (7) sintering. The coating has the advantage that the corrosion resisting performance is improved by 14 times or above, and the coating has the advantages that ductility is high, and coordinative stretching deformation with steel bars can be achieved; and the coating has the beneficial effects that a thermal expansion coefficient gradient is achieved, and the coating can be applicable to different metal and same metal in different models.

Description

technical field [0001] The invention belongs to the field of metal anti-corrosion materials, in particular to a metal anti-corrosion coating, its preparation method and application. Background technique [0002] Entering the 21st century, China has entered the era of great coastal economic development, and there will be a large number of seaport terminals, cross-sea bridges, tunnels, etc. that will use reinforced concrete structures. Among them, the corrosion of steel bars is a major factor affecting the durability of reinforced concrete. Not only at the seaside, steel-concrete structures such as utility poles in saline-alkali areas, pipe piles in humid environments, and bridge piers will also be affected by corrosion. Therefore, effective anti-corrosion measures must be taken for reinforced concrete building structures in harsh environments (such as acid rain, marine environment, deicing salt, high and low temperature environment, humid environment, etc.) to ensure that th...

AI Technical Summary

Problems solved by technology

The corrosion resistance of existing metal anti-corrosion coatings is generally no more than 10 times that of uncoated metals, because the problems affecting metal anti-corrosion coatings have not been solved in essence

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