[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. Residual caustic soda can remain inside the pores of the aluminum profile, especially if the cleaning process is not thorough. During the subsequent oxidation treatment, this leftover caustic solution may seep out, leading to corrosion of the oxide layer around the holes, resulting in defects or voids.
(2) Improper handling of apertures during the drilling process. When tapping screw holes, operators often use lubricants to reduce friction. However, if the caustic solution used for cleaning lacks an emulsifier, it becomes difficult to remove these lubricants effectively. This can lead to residue buildup, which interferes with the oxidation process and causes holes or imperfections in the final product.
Solutions:
(1) Before performing alkali washing, it's recommended to pre-clean the aluminum profiles with gasoline to remove oils and contaminants. Additionally, adding an appropriate amount of emulsifier to the caustic solution will improve its ability to clean thoroughly and prevent residue from remaining in the pores.
(2) After the alkali washing process, ensure that the workpiece is properly rinsed and cleaned again. This step helps eliminate any remaining chemicals or residues that could affect the quality of the oxide layer and cause defects.
By following these steps, manufacturers can significantly reduce the occurrence of aperture holes and improve the overall quality of their aluminum profiles. Proper cleaning and preparation are essential in ensuring a smooth and defect-free oxidation process.
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