[China Aluminum Network] has made the rich copper-colored aluminum profiles suitable for building windows and doors, drawing on the golden yellow obtained by electrolytic coloring with potassium permanganate, and having a golden experience of greatly improving the weathering resistance after electrophoresis. In the past few years, people continuously searched for suitable processes for electrophoresis of copper-colored aluminum profiles. Unfortunately, it was found that the copper color is harder to electrophoretically treat than the yellow color obtained by electrolytic coloring with potassium permanganate. The reason is that the copper color obtained by depositing copper in the pores of the oxide film is prone to anodic dissolution during electrophoretic treatment, resulting in red copper. The color completely fades.
5050 RGB LED is kind of LED with 3 chips and 6 pins.
The 3 chips(Green chip, red chip, blue chip) can be placed at random. Red, green and blue three primary colors according to different brightness (Not all light) single color or mixed color, it will produce many colors. For example, red, pink.
Adding different proportions of three basic color color called additive color mixing, the rules are as follows:
Red + Green = yellow
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In order to make the copper color obtained by electrolytic coloring not fade or fade during the subsequent electrophoresis and baking, it is also possible to protect the copper deposited in the oxide film to prevent it from prone to anodic dissolution.
The following protection measures can effectively prevent copper fading:
(1) The copper-colored anodic oxidation film is semi-closed and can be closed with cold or medium temperature. However, the copper anodic oxidation film cannot be completely closed, otherwise it will seriously affect the electrophoresis process and hinder the formation of the electrophoretic paint film when copper electrophoresis fading is inhibited, and the completely closed copper-colored anodic oxidation film has too low thermoplasticity. When the electrophoretic film is baked, the oxide film rupture will inevitably occur.
(2) The copper anodized film is passivated to form a passivation film on the copper deposited in the pores of the oxide film, so as to prevent copper from anodizing during electrophoresis;
(3) At the same time taking the above two preventive measures, the anti-fade effect is more stable than the single one;
(4) The copper-colored anodic oxide film is subjected to high-temperature hot water treatment at 80-85°C. Equivalent to the protective measures of (1) and (2), but it will affect the electrophoresis process of the posterior tract and deteriorate the performance of the surface electrophoretic membrane;
(5) On the basis of (1) or (2), the hot water washing temperature before the electrophoresis is controlled at 70-75°C, and the hot water washing time is controlled at 7-10 min (the upper limit is taken at higher temperature, and the lower limit is taken at lower temperature). The anti-fade effect is also more stable than a single one;
(6) Perform the secondary electrolytic coloring on the copper-colored anodic oxide film (ie, perform a second electrolytic coloring treatment after coloring with copper and washing with water). The single tin salt or tin-nickel mixed salt coloring bath can be adopted, so that the copper surface deposited in the oxide film hole is protected by trace tin and nickel.
This prevention measure is relatively easy to obtain a stable copper color, and has no negative effect on the suppression of baking film cracking. A small amount of copper sulfate that is brought into the tin salt or tin-nickel mixed salt tank does not generally cause pollution, because copper sulfate is usually The reducing agent present in the tin salt or tin-nickel mixed salt solution is reduced to elemental copper and settled at the bottom of the tank.
Red + blue = Purple
Blue + Green = green
Red + Blue + Green = white
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