What causes the uneven color of the oxide film on the aluminum plate? Specifically, it includes the following three aspects:
(1) the area of the aluminum plate workpiece is too large, the swing in the groove is too large during the use process, and the difference between the edge and the center part and the solution contact, renewal and exchange is too large, resulting in the inconsistent color of the oxide film. Prevention method: when the swing amplitude of workpiece is very small in the oxidation of aluminum plate, the static treatment can also be done, but when the solution temperature is too low, it is easy to appear spots like a map, which is not natural.
(2) in the process of processing, part of the aluminum coating is damaged and cut off, the outer layer is high-quality aluminum, and the inner layer is miscellaneous aluminum. There is a big difference between the two kinds of aluminum, so there are spots like "vitiligo" after oxidation. This phenomenon is often not understood by customers. Manufacturers should do more explanation work and explain the reasons to avoid misunderstanding.
(3) problems in the operation of aluminum plate oxidation process(1)工件碱腐蚀处理不彻底，局部原有氧化膜，污垢未能清除;(2)碱腐蚀后没有立即进行光处理，工件表面仍是碱性的;(3)工件在传动过程中与外界物质接触。
(1) the alkali corrosion treatment of the workpiece is not complete, and the original oxide film and dirt are not removed; (2) the surface of the workpiece is still alkaline without immediate light treatment after alkali corrosion; (3) the workpiece contacts with external substances during the transmission process.
When the color of the film is uneven, we should find out the reasons from many aspects and take measures to solve them.
The basic principles explained to everyone lead to the uneven color of aluminum oxide film. I believe that the technicians of aluminum plate manufacturers have a complete concept. As long as these three unique tactics, film problems and the uneven color of aluminum oxide plate are solved.
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