Anodized coloring process for extruded wood - coloring

The aluminum alloy extrusion material is colored by electrolytic coloring, chemical dyeing, and natural coloration (overall coloring). Architectural aluminum doors and windows mainly use electrolytic coloring, chemical dyeing for interior decoration and handicrafts, and natural coloration has been used in the early days. At present, domestic and foreign countries have basically not used this technology. In the electrolytic coloring process, particles of metal (and possibly oxides) generated by electrochemical reduction are deposited at the bottom of the micropores of the oxide film. The color is not the color of the deposit, but is the result of scattered light scattering by the deposited particles. Chemical dyeing is the adsorption of inorganic or organic dyes on the top of the micropores of the oxide film, and the color is the color of the dye itself. Electrolytic coloring is low in cost, and has good weatherability and other performance. The color of chemical dyeing is colorful, but it is easy to discolor in outdoor use.

(1) Champagne. In electrolytically colored aluminum, light colors such as champagne account for about half. Early use of tin salt or tin-nickel salt, nickel salt in the past two years with its color tone gradually gaining the upper hand.

Champagne differs greatly in shades and shades of color. This is caused not only by nickel salts and tin salts, but also by factors such as the state of the alloy, power supply equipment, process parameters, bath composition, and factory water quality. Therefore, it is difficult for different manufacturers to produce exactly the same champagne color and imitation stainless steel color. The key points of the process for producing champagne products are as follows:

1) Reasonably tie the material, generally the groove is up, and the decoration is facing up or facing the electrode. Insufficient inclination of the binding material can cause chromatic aberration in the upper and lower surfaces and air bubbles in the lower surface. Inadequate electrode spacing can cause vertical plane color differences. Poor electrical contact during tying will cause chromatic aberration between the profiles on the hanging material and discoloration at the ties.

2) The counter electrode in the coloring tank that exceeds the hanging zone should be removed or blocked with a plastic plate to prevent the surrounding color from deepening.

3) When the material is hung into the coloring tank, it is not energized first, soaked for 1 to 2 minutes, which is conducive to the deposition of colored particles into the bottom of the hole, so that the color is not easy to fade.

4) For champagne and other light-colored systems, the voltage should rise at a rapid rate (5~10s). Due to the short total coloring time of the light color system, the low voltage time of the voltage rising section is too long, and the profile groove color is too light.

5) The light color should not be lower than the bronze voltage. The coloring voltage is low, the color dispersion is poor, and it is easy to fade.

6) The free sulfuric acid concentration should be higher in order to increase the conductivity of the bath fluid and make the color dispersibility better. Although the degree of sulfuric acid is high when light-colored, since the time is short, the surface of the oxide film is not corroded.

7) After the end of coloring, it should be quickly washed with water, and the transfer speed is slow, and dark or light bands of the profiles will appear.

8) In tin tin salt additive, the complexing agent is different, and the background color is different.

9) Pay attention to the effect of cold sealing on the light color.

(2) Golden yellow (main salt of potassium manganate). Manganate production control is relatively easy with gold, if the subsequent electrophoresis, the production is more difficult.

Manganese salt production process operation points are as follows:

1) Potassium manganate is a strong oxidant and the bath itself is consumed quickly. The concentration of free sulfuric acid in the bath is high and the gold is brighter, but its consumption is also greater.

2) The quality of potassium manganate is golden yellow, and the process control of anodizing and sealing is extremely important. The thickness of the film should be too thin at 12~15μm, and the color redness is not bright. Pore ​​quality is not good.

3) The ratio of colored electrode areas should be greater than 1:1. Loose plates, breakages, and small electrode ratios can affect dark colors or cause "white spots" on the surface and "white circles" in the middle of the material.

4) When producing ordinary golden color, you can use oxide film reaming method to deepen the color, such as soaking in the oxidation tank for 2~4min, soaking in acidic water in the first tank for 10~20min, or soaking in the coloring tank for 3~5min. However, the quality of the sealing hole must be strictly guaranteed at this time.

5) When electrophoretic golden color is produced, darkening cannot be used to deepen the color. On the contrary, it is necessary to appropriately lower the temperature of the oxidation tank and the groove, speed up the transfer rate, and even lower the curing temperature of the electrophoretic layer to avoid defects such as coloring, white spots and solidification.

(3) "Titanium" color (mainly selenate salt). This is also a kind of golden yellow, but it is quite different from the golden yellow of manganate, and it is close to the golden tone. Therefore, it is also called the "K gold" color. Our country is generally called “titanium gold” color, and it has nothing to do with titanium. It is also known as rose gold in foreign countries. The electrophoretic titanium gold also has a problem of fading when it is cured. Therefore, the temperature difference of the curing furnace must be within ±5°C, and the temperature should be appropriately reduced.

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