Method for preparing aluminum alloy element surface coating and system thereof

Abstract

A method for preparing an aluminum alloy element surface coating comprises the following steps of sequentially pre-treating the aluminum alloy element surface, preparing aluminum alloy element surface arcing-blocking coating, preparing aluminum alloy surface insulation composite ceramic coating and performing post-treatment; the preparation of aluminum alloy element surface arcing-blocking coating is to perform coating in a deionized water electrolyte system composed of NaOH, Na2SiO3, (NaPO3)6 and K2ZrF6; the system for the preparation of aluminum alloy element surface coating comprises a stainless steel solution tank (7), tooling (4), an aluminum alloy element (5), a stirrer (2), a thermometer (6), a water-circulating cooling device (1) and power supply equipment (8). The aluminum alloy member surface coating obtained from the method and the system of the invention has the advantages of high toughness and strong binding capacity with the surface of the aluminum alloy element, long service life and excellent heat insulation performance.

Description

technical field [0001] The invention relates to a method for preparing a coating and a production system thereof, in particular to a method and a system for preparing a composite ceramic coating with heat-insulating and anti-ablation properties on the working surface of aluminum alloy parts. Background technique [0002] With the promulgation of relevant policies such as national energy conservation and emission reduction, aluminum alloys have been widely used and advocated in industry as a substitute for metal materials such as steel to reduce the weight of parts. However, aluminum alloys have low melting point, fast heat transfer, and easy oxidation at high temperatures. Such defects seriously limit the scope of use of aluminum alloys in high-temperature environments. In a short period of time, the melting point and oxidation resistance of aluminum alloys are greatly improved, and it is almost impossible to meet the requirements of high-temperature environments. Undoubtedl...

AI Technical Summary

Problems solved by technology

[0002] With the promulgation of relevant policies such as national energy conservation and emission reduction, aluminum alloys have been widely used and advocated in industry as a substitute for metal materials such as steel to reduce the weight of parts. However, aluminum alloys have low melting point, fast heat transfer, and easy oxidation at high temperatures. Such defects seriously limit the scope of use of aluminum alloys in high-temperature environments. In a short period of time, the melting point and oxidation resistance of aluminum alloys are greatly improved, and it is almost impossible to meet the requirements of high-temperature environments. Undoubtedly a feasible measure

[0003] As an excellent thermal insulation coating, zirconia has been paid attention to by various countries, and a lot of research has been carried out. However, due to the limitations of its own characteristics and preparation technology, the existing technology mainly uses plasma spraying, physical vapor deposition and other technical means to prepare coatings. , Plasma spraying, physical vapor deposition and other methods all melt zirconia and then evaporate and deposit it on the surface of the substrate. Due to the characteristics of aluminum alloy materials, it is difficult to prepare zirconia ceramic coatings on its surface by conventional methods.

Generally speaking, the existing preparation process of zirconia ceramic coating has insufficient coating bonding force and is easy to be brittle, so the service life is not long, and the existing preparation processes such as plasma spraying, electron beam physical vapor deposition and other technical means are due to the need High-temperature molten zirconia is evaporated and deposited on the surface of the workpiece substrate, so the coating can only be prepared on the surface of high-melting point materials such as steel and composite materials, and due to the difference in thermal expansion coefficient between the coating and the substrate, it is easy to cause the coating to cool down to room temperature. Cracks will affect the adhesion of the coating and limit the application of zirconia on the surface of light alloy materials such as aluminum alloy

Images