A kind of metal anticorrosion coating, its preparation method and application

Abstract

The invention discloses a metal anticorrosion coating, which is an inorganic coating and is used for metal anticorrosion. The coating has a double-layer structure, including an outer layer of enamel coating and an inner layer of matrix oxide coating. At the same time, the content of matrix metal oxide decreases from the inner layer to the outer layer, so that the thermal expansion coefficient of the coating is changed from the inner layer to the outer layer. Increasing to the outer layer ensures that the overall thermal expansion coefficient of the coating is consistent with various base metals. The composition of the enamel coating of the outer layer includes 1-40 parts by weight of silicon, 1-30 parts of sodium, 1-20 parts of potassium, 2-20 parts of calcium, 0.5-15 parts of fluorine, 0.3-10 parts of cobalt, and 0.2 parts of nickel. ~10 parts, 1-18 parts of boron, 0.5-10 parts of phosphorus, 0.1-8 parts of magnesium, and the rest is oxygen; the composition of the matrix oxide coating of the inner layer includes matrix metal and oxygen. Also disclosed is a preparation process for a double-layer dense metal anti-corrosion coating formed by low-temperature sintering, including the following steps: 1) grinding; 2) preparing a mixture; 3) grinding; 4) high-temperature reaction; 5) grinding; 6) coating Cover; 7) Sintering. The coating of the present invention has the advantages of increasing the corrosion resistance by more than 14 times, has the advantages of high ductility, can cooperate with steel bars to stretch and deform, has the gradient of thermal expansion coefficient, and can be applied to different metals and different models of the same metal.

Description

Technical field [0001] The invention belongs to the field of metal anticorrosive materials, and in particular relates to a metal anticorrosive coating, a preparation method and application thereof. Background technique [0002] In the 21st century, China has entered an era of great coastal economic development. There will be a large number of seaports, bridges, and tunnels 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, but also steel-concrete structures such as telegraph poles, pipe piles, and bridge piers in saline-alkali areas are also 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 environments, humid environments, etc.) to ensure that the building reaches its design life...

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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