Why Is the Color of Aluminum Oxide Film Uneven? -WJW Aluminum Supplier Aluminum
Author： WJW Aluminum Window Manufacturers
Three possible reasons for the color of aluminum -type oxide film:
The main results are as follows: (1) The area of the workpiece is too large, the inside of the groove is too large, and the edge of the solution is in contact with the center contact, update, and exchanges, resulting in inconsistent colors of the oxide film. Prevention method: During the oxidation process, the workpiece swing is small and can also be treated with static treatment. However, when the temperature of the solution is too low, it is easy to appear map -like spots, which is unnatural.
(2) The aluminum coating is partially destroyed and cut off during the processing process. The outer aluminum is high -quality aluminum, and the inner layer is miscellaneous aluminum. The difference between the two types of aluminum is very large. I don't understand, the manufacturer should do more to explain and explain the original work, so as not to cause misunderstandings.
(3) Process operation issues
(1) The alkali corrosion treatment of the workpiece is not thorough, and the original oxide film and dirt cannot be cleared locally;
(2) When light treatment is not performed immediately after alkaline corrosion, the surface of the workpiece is still alkaline.
(3) The workpiece has always been in contact with foreign bodies during the transmission process.
When the color of the film layer is uneven, we should find out the reason from multiple aspects and take targeted measures to solve it.
Due to the excessive accumulation of aluminum ions in the alkaline corrosion solution, a reader called to ask why it is difficult to obtain a conductive oxide film after alkali corrosion. After eliminating many factors that the conductive oxide film is difficult to form, considering that the aluminum ion content in alkaline corrosion is too high, the other party believes that the alkaline corrosive solution is very thick. But the alkali erosion rate is not fast. At that time, the author suggested replacing alkaline corrosion liquids, because after the alkali corrosion liquid is used for too long, aluminum ions will accumulate too much, and aluminum ions will be difficult to elute on the surface of the workpiece, which will affect the contact with the surface of the aluminum part with the conductive oxide, which will affect the oxide film Formation. Another suggestion is that if the alkali corrosion liquid is replaced unconditionally at the time, the alkaline erosion workpiece can be rinsed immediately after the hot water was washed, and then the hydrofluoric acid lit is brightened. After that, the reader called and said that the effect of washing and ironing with hot water after the alkali erosion was very good. "The authors experience is that after washing and ironing in hot water, the hot water will leave quickly and immediately immerse them into tap water to prevent the formation of conductive oxide film caused by the oxidation of the workpiece after drying.
