The Reasons and Solutions for the Yellowing of Aluminum Profiles in the Electronics Industry! -Ruminum Profiles Supplier
Author： WJW Aluminum Window Manufacturers
1. During the oxidation process, the yellowing industrial aluminum profiles caused by poor conductivity of industrial aluminum materials are poor in contact with the conductive rod. The contact resistance will greatly increase. It will also be powder.
At this time, the oxide film was a bit turbid and the color was slightly yellow.
If the electricity is performed again, a very obvious pale yellow phenomenon will occur. This yellowing usually rarely appears in the next line, and basically appears at the end of the configuration file.
Therefore, measures must be taken to ensure good contact between industrial aluminum profiles and conductive rods.
2. The yellowed oxidation film caused by not fully cleaning before the electrophoresis is honeycomb -like. The porous structure determines that sulfuric acid will remain in the hole of the oxide film. As we all know, if the outline of electrophoresis is not completely rinsed with water, it may be yellowed. For this yellowing, the acid root in the oxide membrane pores is generally considered to react with the electrophoretic coating, causing the yellowing coating film. In fact, this yellowing is not the yellowing of the paint film, but the yellowing of the oxide film. Ordinary oxide film is transparent.
If there are more root sulfate in the oxide hole, the oxide film will react with the root of sulfate at high temperature conditions, so that the transparent and transparent oxide film will become turbid and transparent. At the same time, due to the high transparency of the electro -coating film and the high reflectivity of the light, the defect was further enlarged and the so -called yellowing was formed.
Therefore, it is very important to wash several times before the electrical sword. It is not only necessary to ensure the quality of washing water, but also to ensure the washing temperature and washing time.
3. The phenomenon of yellow change caused by nitric acid is polluted by nitric acid. In order to achieve a better gray removal effect, it is understandable to add a certain percentage of nitric acid to a neutralized tank. When the nitrate concentration in the oxidation tank of the industrial aluminum -type aluminum -type oxidation tank reaches a certain concentration, it will have a certain effect on the oxidation, and even the electrical vessels will be yellow. During the oxidation process, the nitrate that enters the oxidation membrane pores will corrode the oxidation film, corrode the blocking layer of the oxide film, make the oxide film darker, and change the structure of the membrane. This corrosion has two effects on the oxide film:
(1) The blocking layer of the oxide membrane becomes thinner, and the density of the aluminum substrate becomes worse, which then reduces the density of the oxide film.
(2) Under normal washing conditions, it is difficult to remove sulfate in the membrane hole. The electro -shirts generated under this condition will also be yellow.
How to avoid this yellowing phenomenon? Add neutralizers to the pure water tank in front of the scald pond, adjust the pH value to 8 9.5, washed for 2 to 3 minutes, use the sulfuric acid root in the aminel neutralization and oxidation film holes, and then perform electrical production. The phenomenon has changed.
4. The yellowing caused by excessive solidification The current electric paint used in the market is basically baking and solidifying at 180 C X30min. Under normal conditions, the paint film will basically not turn yellow. However, the temperature of some aluminum profile manufacturers is very uneven, and the local temperature difference is even more than 30 C.
The temperature control system of some manufacturers is poor, and the actual temperature is too different from the display temperature. The inferior electric paint is here. Under these conditions, the phenomenon of yellowing is very obvious, and even looks like a color. High -quality electric paint can withstand this extreme condition. Some electro -painted paint will not turn yellow even if it is baked at 230 C. In order to prevent yellowing, it is necessary to maintain the uniformity of the furnace temperature and the sensitivity of the temperature control system, and it must also use high -quality electrical paint.
5. The yellow anode electro -vibration paint caused by the electrophoretic paint itself is mainly composed of acrylic resin and amino resin. During the baking process of the electro -duct, the resin response to the cross -linking reaction of the resin to produce a smooth and transparent coating film. However, due to the immature production process of some electrical paint manufacturers, or using inferior chemical raw materials to reduce costs, the scope of solidification is relatively narrow.
If the baking is slightly insufficient, the hardness of the paint film is insufficient; otherwise, there is insufficient.
If the baking is excessive, the paint film will become yellow, which will cause some difficulties to production management.
Therefore, it is recommended that you still choose paint suppliers with stable product quality and a certain reputation.
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