[China Aluminum Industry Network] Causes of Aperture Holes in Aluminum Profiles and How to Prevent Them:
(1) Incomplete cleaning of aluminum profiles after alkali washing can lead to the formation of holes. During the caustic washing process, some alkali may get trapped inside the pores of the aluminum profile. If not thoroughly rinsed, this residual caustic solution can seep out during subsequent oxidation treatment, causing corrosion around the pores and eventually leading to the appearance of small holes on the surface.
(2) Another common issue occurs around the hole areas of aluminum profiles, especially when there are tapping screw holes. These areas tend to be very tight, and operators often apply lubricants or cutting oils to ease the process. However, if the caustic solution used for cleaning lacks an effective emulsifier, it becomes difficult to remove these oils completely, leaving residues that can interfere with the oxidation process and cause defects such as holes or uneven oxide layers.
Solutions:
(1) Before performing caustic washing, it is recommended to clean the aluminum profiles with gasoline to remove any grease or oil residue. Additionally, adding an appropriate emulsifier to the caustic solution can help improve the cleaning efficiency and ensure that all contaminants are properly removed.
(2) After the caustic washing process, it is essential to rinse the workpiece thoroughly with water to eliminate any remaining caustic solution or impurities. This step is crucial in preventing corrosion and ensuring a uniform oxide layer during the oxidation stage.
By following these steps, manufacturers can significantly reduce the occurrence of aperture holes in aluminum profiles, improving both the quality and aesthetics of the final product. It's important to maintain strict control over the cleaning process and use the right chemical additives to achieve optimal results.
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