[/url][url=http://aluminum-hot-rolled-plate.com/]Aluminum plate is divided into pure aluminum plate, alloy aluminum plate, thin aluminum plate, medium and
thick aluminum plate pattern aluminum plate. The aluminium plate used in the building includes many kinds of materials, such as single layer aluminum plate, composite aluminium plate, etc., and usually refers to a single layer
aluminum plate, which is mostly used in architectural decoration project. In recent years, the single deck aluminum plate used in the aluminum curtain wall is more common. Shenzhen aluminum supplier analyzes the causes of black spot on aluminium plate surface.
First is the
aluminum plate material, the aluminum plate manufacturer produces the
aluminum plate the upper cover is by the 0.5mm thick LF21 aluminum plate processing. The aluminum sheet of this model has a variety of materials, similar shapes and parts of the same process, while similar parts of the same type of processing did not occur at the same time. And this is not the fault caused by the defect of the raw material. It is in the process, silver plated cover roughly the process route is: machine parts - Pretreatment - zinc - zinc - plating copper plating - paint - dipping 823 - storage.
Cause analysis of black spot on
aluminum plate \"
On the aluminum plating process, first of all, there may be a production process of electroplating has changed, which led to the failure. But the investigation found that the production conditions did not change any situation, the same period of processing similar parts did not appear such failures. Therefore, the factors that influence the change of electroplating conditions have been eliminated. According to the previous production experience, the most common reason for the discoloration of silver plate is the effect of sulfur on the silver coating.
In the past, silver plated parts were not packed in time and sealed for preservation. They were left in the plating room for a long time, resulting in yellowing of the silver coating. However, after the failure of the silver plated parts are packaged in a timely manner and placed in a dry container to save, it can be seen that this is not affected by the factory air atmosphere. In the painting process, it is found that the upper cover of the paint processing, there has been a batch of repair records. The most important reason is that the gap is not blocked so that the paint mist enters and adheres to the surface of the silver plating layer and cannot be removed. To prevent the occurrence of such failures, it is suggested that the 3M tapes be used to seal the gap so as to prevent the paint mist from entering.
Through this method of elimination, the root of the problem has been found, and measures should be taken to prevent the recurrence of the hidden trouble, so that the surface of the
aluminum plate is bright and new, and the factory rate will be greatly improved.