ã€China Aluminum Network】 In order to improve the quality of aluminum parts and dyeing and solid color, the fine pores of the oxide film must be sealed after the coloring process. After the sealing treatment, the surface becomes uniform and non-porous, forming a dense oxide film. The dye is deposited in the oxide film and will not be rubbed off again, and the closed oxide film will no longer have adsorptivity, so that it can avoid contamination or early corrosion due to adsorption of harmful substances, thereby improving the anti-pollution, anti-corrosion, etc. of the anodized film. performance. The commonly used methods of sealing after coloring include hydration sealing, inorganic salt sealing, and transparent organic coating sealing.
(a) The hydration sealing pores hydration sealing pores include boiling water sealing pores and atmospheric pressure and pressure steam sealing pores.
1. Principle of hydration and sealing The aluminum anodized film has two forms of reaction in water. First, in water below 80 degrees and pH<4, it combines with water into Bayer alumina trihydrate. This combination is only It is a physical combination and the process is reversible. The other is in the neutral water above 80 degrees, alumina and hydration synthesis of boehmite type alumina monohydrate, which is the reaction process commonly referred to as hydration sealing, due to the density of monohydrated alumina (3014kg It is smaller than alumina (3,420 kg/m3) and its volume increases by about 33%, blocking the pores of the oxide film.
2. Factors affecting the sealing of boiling water (1) Time and temperature: Under the premise of relatively uniform other conditions, with the prolongation of the sealing time, the amount of bound water in the membrane layer increases, and the corrosion resistance increases; with the increase of the sealing temperature, The degree of hydration improves and the corrosion resistance increases.
(2) pH value and water quality: Generally, the pores are sealed in the sealing solution with a pH of 5.5-6.5. The membrane layer not only has good corrosion resistance but also has good wear resistance. The content of impurities in the water should be controlled: sulfate ion <250mg/kg, chloride ion <100mg/kg, silicate ions <10mg/kg, phosphate ions <5mg/kg, fluoride ions <5mg/kg. It is preferable to use pure water, which has a resistivity of 5×10 Ω·cm.
(3) Additives: Adding certain additives such as anhydrous sodium carbonate, ammonia, and triethanolamine in boiling water can enhance the sealing effect, improve the corrosion resistance of the film, and even correspond to or exceed the steam sealing.
Another method of hydration sealing is steam sealing, and the corrosion resistance and wear resistance of the treated oxide film are related to steam pressure and sealing time. In general, pressure increases, time is extended, corrosion resistance increases, and wear resistance decreases.
3, boiling water, steam sealing process boiling sealing hole, steam sealing process in Table -12. The sealing effect of steam (atmospheric pressure and pressure) is better than that of sealing with boiling water, but high-pressure vessels or special steamers are required. Therefore, steam sealing holes, especially pressurized steam sealing holes, can only be used for the treatment of small products. Large-scale product and assembly line production use.
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