In the aluminum factory or the application process, sometimes there will be a black spot above the situation, for this situation is how is it? Let's look at the next. The first is the aluminum material, aluminum plate manufacturers of aluminum cover is 0.5mm thick LF21 aluminum sheet from processing. This model has a variety of aluminum materials with the same, similar ...
In the aluminum factory or the application process, sometimes there will be a black spot above the situation, for this situation is how is it? Let's look at the next. The first is the aluminum material, aluminum plate manufacturers of aluminum cover is 0.5mm thick LF21 aluminum sheet from processing. This type of aluminum plate with a variety of the same material, similar shape, with the process of parts, while the same period of processing the shape of the parts did not appear such failure. And this is not the fault of raw materials caused by the failure. Then in the processing technology, the cover of the general process of silver plating: Machine plus parts - Pre-treatment - Zinc - electro-galvanized - electroplated silver - plating silver - painting - dip 823 - storage.
In the aluminum plating process, first of all, there may be a plating production processes have changed, resulting in failure. However, after investigation found that no change in the production conditions of the case, the same period of processing similar parts did not appear such failure. Therefore, the factors that cause the change of plating production conditions are eliminated. According to past production experience, lead to silver pieces of the most common cause of discoloration of sulfur element on the silver layer.
In the past, silver parts have occurred after the packaging is not timely and sealed, long placed in the electroplating factory in the lead layer of silver-plated yellow. However, the fault parts silver plated, are timely packaging and placed in the preservation of drying containers, we can see that this is not affected by the plant air atmosphere. In the painting process, found the cover of the paint processing, there have been batch of repair records. The most important reason is that the gap is not blocked, so that paint mist into the surface and attached to the silver-plated layer can not be removed. In order to prevent the occurrence of such failures, the processing process, the proposed 3M tape will be sealed gap to prevent paint mist into.