Super-hydrophobic heat-resistant coating for aluminum alloy and preparation method of super-hydrophobic heat-resistant coating

Abstract

The invention discloses a super-hydrophobic heat-resistant coating for an aluminum alloy and a preparation method of the super-hydrophobic heat-resistant coating, and relates to the technical field of coatings. The heat-resistant coating is formed on the surface of the aluminum alloy through the spraying pretreatment process and the second-time spraying treatment in sequence, the heat-resistant coating and the aluminum alloy form a firm cross-linked interpenetrating network structure, the heat resistance of the coating is improved, and the phenomenon that the service life of the aluminum alloy is shortened in a high-temperature environment is reduced; and then third spraying treatment is conducted, a corrosion inhibitor serves as an inner core solution, stearic acid serves as a shell solution, a super-hydrophobic coating is formed through coaxial electrostatic spraying, the corrosion inhibitor is prepared from isoquinocarboxylic acid, dipropylene triamine and p-methoxyphenyl thiourea, the surface of the aluminum alloy is isolated from an environment medium, and corrosion of an acid medium and chloride ions is inhibited. The prepared super-hydrophobic heat-resistant coating for the aluminum alloy has the heat-resistant, super-hydrophobic and corrosion-resistant effects.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a superhydrophobic heat-resistant coating for aluminum alloys and a preparation method thereof. Background technique [0002] Aluminum alloy is a kind of metal widely used in the industry. It has excellent characteristics such as light weight, high strength, and good machinability. It is widely used in high-tech fields such as aerospace and marine tooling. In the environment, aluminum alloy is extremely prone to corrosion, which affects the long-term reliable operation of key components. Focusing on metal anti-corrosion coatings, countries around the world have developed a variety of aluminum alloy anti-corrosion technologies, mainly including anodic oxidation, chemical conversion coating, electroplating and chemical plating. Among them, chromium-containing chemical conversion coatings are highly efficient and widely used, and Dacromet coatings are more typical. However, such c...

AI Technical Summary

Problems solved by technology

Among them, chromium-containing chemical conversion coatings are highly efficient and widely used, and Dacromet coatings are more typical. However, such coatings will release carcinogenic hexavalent chromium during production and use, which is highly toxic to organisms.

[0003] In addition, aluminum alloys are also lacking in heat resistance.

At present, the heat-resistant aluminum alloy materials on the market are mainly manifested in the instability of the alloy composition, accompanied by defects such as flashes, burrs, cracks, and inclusions, which lead to the physical properties of the aluminum alloy not meeting the requirements of users and the market, thus causing serious problems for both the supply and demand sides. big economic loss

For heat-resistant alloy materials produced by general manufacturers, the focus of production is mainly to control various harmful elements that affect heat resistance, and in order to improve performance, some alloy elements will be added in an appropriate amount. The requirements are relatively strict, which makes it difficult for many manufacturers to produce stably or It cannot be produced, which also makes the cost of heat-resistant alloy materials increase sharply, which brings a certain economic burden to the demand enterprises