Method for sealing the pores of anodized film on the surface of aluminum alloy by titanium dioxide gel

Abstract

The invention discloses a method for sealing an aluminum-alloy surface anode oxide film hole by adopting titanium dioxide gel. The method comprises the following steps: carrying out anode oxidization, electrolytic coloring, and nanometer titanium dioxide gel hole sealing onto an aluminum-alloy matrix material, wherein an oxide film with a compact layer and porous layer structure is generated on the surface of the matrix material, so that corrosion resistance of the matrix material is improved; electrolytic coloring is used for depositing nano-metal antibacterial particles in the porous layer, so that the porous layer has an antibacterial performance; the titanium dioxide gel hole sealing is used for enabling nano titanium dioxide with self-cleaning and sterilizing effects to be stably exist on the aluminum-alloy surface, so that the aluminum-alloy surface has self-cleaning performances, and the aluminum alloy has dual antibacterial performances by virtue of the nano titanium dioxide and nano-metal antibacterial particles; meanwhile, the aluminum alloy also has a decorative effect. A multifunctional coating prepared by the method disclosed by the invention has various functions such as decoration, corrosion resistance, wiping resistance, antibacterial performance and self-cleaning performance, and can be used for aluminum-alloy preparation industries of food, medical treatment, tobaccos and the like. Besides, range of application of the aluminum alloy can be effectively expanded.

Description

technical field [0001] The invention discloses a method for sealing the pores of the anodic oxidation film on the surface of aluminum alloy, in particular to a method for sealing the pores of the anodic oxidation film on the surface of aluminum alloy by using titanium dioxide gel. It belongs to the technical field of surface treatment. [0002] technical background [0003] Aluminum alloy has low density, but relatively high strength, which is close to or exceeds high-quality steel, and has good plasticity. It is the most widely used non-ferrous metal structural material in industry. It has excellent electrical conductivity, thermal conductivity and corrosion resistance, and is widely used in industry. , the amount of use is second only to steel, and it is widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industries. Due to the light weight, low price, and minimal toxicity of aluminum alloys, compared with stainless steel and ...

AI Technical Summary

Problems solved by technology

[0007] 1. Since the hole sealing is sealed with boiling water containing nano-sized titanium dioxide particles, although the boiling water sealing can make use of diffusion to make part of the titanium dioxide particles diffuse into the pores of the oxide film during the sealing process, the titanium dioxide embedded in the sealing layer through diffusion The number of particles is limited, and the photolysis and self-cleaning ability is not high;

[0008] 2. Since titanium dioxide particles cannot be combined with the film layer, they can only exist in the pores of the film and cannot be attached to the surface of the oxide film. Titanium dioxide particles only exist in the pores of the film, and there is no titanium dioxide on the surface of the film layer, which further limits its photolysis and self-cleaning ability

[0009] 3. After anodic oxidation treatment and electrolytic coloring, the porous oxide film formed on the surface of aluminum alloy is mainly boehmite (aluminum oxyhydroxide). The final oxide film layer is rapidly corroded, resulting in a rapid decline in the aesthetics of the aluminum alloy surface, and a decrease in wear resistance and corrosion resistance.

[0010] 4. Boiling water is used to seal the hole, and the energy consumption is relatively high

[0011] There is no public report about titanium dioxide gel as an aluminum alloy oxide film sealing material.