[ALUMINIUM NETWORK] The appearance of aluminum and aluminum alloys is mainly characterized by the use of a thick and porous film of aluminum anodic oxidation film. The oxidized aluminum parts are immersed in a dye-rich solution. The aluminum outer oxide film The pinhole absorbs the dye and colors it. Dyes are organic dyes and inorganic dyes. Organic dyes are divided into water-soluble and oil-soluble. The organic dyes are better than the inorganic dyes in terms of the type of color, the speed of coloring, the firmness of the color, and whether the operation is concise. Commonly used in organic dyeing is the use of direct dyes, acid dyes, alizarin dyes, reactive dyes, and dyes that are soluble in water, such as dyestuffs, which are rich in color.
Aluminium and aluminum alloy anodic oxidation film yellowing solution formulations and technical conditions are listed in Table 3-34.
Table 3-34 Formulas and Technical Conditions for Aluminium and Aluminum Alloys in Solution
Solution composition and technical conditions
1
2
3
4
5
Alizarin Yellow R (or GG)/(g/L)
0.3
Alizarin Red S/(g/L)
0.5
Acetic acid / (mL/L)
Golden iodine-IGK/(g/L)
0.035
Dissolved orange yellow IRK/(g/L)
0.1
Reactive brilliant orange/(g/L)
0.5
Active Yellow X-6G/(g/L)
1 to 2
Lead Yellow GLW/(g/L)
2 to 5
water
margin
margin
margin
margin
margin
Solution pH
4.5 to 5.5
4.5 to 5.5
4 to 5
5 to 5.5
Solution temperature/°C
70~80
Room temperature
70~80
25～35
Room temperature
Immersion time/min
1 to 3
1 to 3
5~l5
2 to 5
2 to 5
The
After dyeing the dye solution of Formula 2 in Table 3-34, it must be disposed in the coloring solution. The coloring fluid formulation is as follows.
1. Formula 1 Potassium permanganate 4 to 7 g/L, sulfuric acid 20 g/L, impregnated at room temperature.
2. Formulation 2 sodium nitrite l0g/L, sulfuric acid 20g/L, impregnated at room temperature.
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