The appearance problems encountered in the machining process of aluminum materials will also be oxidized after film formation, and will always be affected by some impurities.

Dealing with these problems is a headache for many enterprises, and the measures for the appearance treatment of aluminum will be mentioned below. Of course, if the enterprise has the conditions, it can develop a good film-forming technology to fight against oxidation.

An extremely thin oxide film is formed on the surface of aluminum in the atmosphere, which makes it anticorrosion. However, because the film is porous and uneven, it can not be used as a protective film, and the film is amorphous, which makes aluminum and its alloy lose its original luster and can not be used as a satisfactory decorative film layer.

The oxide film obtained by chemical oxidation of aluminum is generally 0.3-4p "thick, with low softness and corrosion resistance: anodic oxide film, so it is rarely used alone except for its usefulness. Promote it to have a good adsorption ability, and keep its surface paint, the corrosion-resistant parts of uT progressive aluminum and the oxide film of the continuation part C after anodic oxidation treatment; Generally, the thickness is 5-20p ",and the thickness of the anodic oxide film can reach 60-25p".

First of all, the film-forming speed of aluminum is different from that of different types of aluminum. After electrochemical conversion, the difference in surface color is more obvious than that of oxide films obtained by different process formulas. Aluminum purity and slow film forming speed; The purity of aluminum is low, but the opposite is true. Therefore, the oxidation needs to be controlled according to different aluminum materials. In order to do this, different types of aluminum products are not allowed to be tied in the same string, so as not to control their oxidation time. Chemical disposal and mechanical disposal, or direct chemical disposal. As for the appearance of heavily oxidized metal, the thick oxide layer makes it impossible for aluminum to be directly cleaned and chemically disposed with solvent.

Some methods can be used as a reference: 1. Defatting treatment, stop wiping with absorbent cotton wet solvent, remove oil stains, and then wipe with clean cotton cloth for several times. Common solvents include trichloroethylene, ethyl acetate, acetone, butanone and gasoline. 2. After degreasing, chemically treat in the following solution: 3-3.5 ammonium hydrogen fluoride, 20-26 chromium oxide, 2-2.5 sodium phosphate, 50-60 concentrated sulfuric acid, 0.4-0.6 boric acid and 1000 water for 4.5-6min, that is, stop washing and get bored. This method has high bonding strength and can be bonded within 4 hours after disposal, which is suitable for epoxy adhesive and epoxy-nitrile adhesive bonding. 3. After degreasing, stop the anodizing treatment in the following solution: soak 22g/l concentrated sulfuric acid for 10-15min at the DC intensity of 1-1.5A/dm2, then soak it in saturated potassium dichromate solution at 95-100 C for 5-20min, and then wash it with water, which is boring. After disposal, the metal surface is highly active, and it is easier to be polluted by dust and moisture again. Therefore, after disposal, the metal surface should stop gluing as soon as possible.

The aluminum oxide film also has the following characteristics:

(1) The invasion degree is high. The hardness of pure aluminum oxide film is higher than that of aluminum residual oxide film, and its hardness is usually related to the composition of aluminum and the conditions of electrolyte during anodic oxidation of industrial aluminum. The hardness of ordinary oxide film is 300Hv, and the hardness of hard turn oxide film is 500Hv. Anodized oxide film not only has high hardness, but also has good wear resistance. In particular, the oxide film with many ZL layers on the surface has the ability to absorb the smoothing agent, and Mf further improves the wear resistance of the surface.

(2) It has high corrosion resistance. This is because the anodic oxide film has high chemical stability. After testing, the anodic oxide film of pure aluminum has better corrosion resistance than the anodic oxide film of aluminum alloy. O This is because the aluminum alloy component is mixed or the constituent metal compound cannot be oxidized or dissolved, which makes the oxide film have a continuous or stop gap, thus artificially reducing the corrosion resistance of the oxide film. Therefore, the film obtained by ordinary anodic oxidation must stop blocking.

(3) Good adsorption ability. The anodic oxide film of aluminum and aluminum residue is porous and has strong adsorption ability, so the anti-expansion, insulation, wear resistance and decorative properties of aluminum can be further improved by filling seed pigments, smoothing agents and resins into the pores

(4) Good insulation performance. The anodic oxide film of aluminum material has become a good insulation material because it does not have the conductivity of metal, and the insulation breakdown voltage is greater than 3017/Pm:

(5) Strong heat insulation and resistance. This is because the thermal conductivity of anodic oxide film of aluminum profile is much lower than that of pure aluminum.

(6) The organic coating has strong adhesion to the electroplated layer.

(7) Good functionality. Using the porosity of anodic oxide film, functional particles are accumulated in the particles. Functional data can be obtained. C The functional components under development include electromagnetic function, catalytic function and separation function. To sum up, after anodic oxidation treatment, the oxide film on the surface of industrial aluminum has good protection and decoration characteristics, so it is used in aviation, electricity, electronics, machinery manufacturing and light industry, and architectural decoration.

After the surface film of aluminum material is polluted, the quality of subsequent coating will be affected. If the above methods are not adopted, aluminum can be self-assembled into a film by using a new aluminum surface. After this film-forming technology, the oxidation resistance can be better than that of the previous traditional technology.

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