Patterned aluminum plate is a relatively common building material, and its process is mainly divided into three parts: de-esterification, sand mill, and water washing. Among them, water washing is a very important process. In order to ensure the surface quality and welding quality of the aluminum plate, strict cleaning measures must be taken to thoroughly remove the grease and oxide film on the surface of the aluminum plate and the welded joints. So how to clean the brushed aluminum plate?
1. Mechanical cleaning: When the size of the workpiece is large, the production cycle is long, and it is contaminated after multiple layers or chemical cleaning, mechanical cleaning is often used. First wipe the surface with acetone, gasoline and other organic solvents to remove oil, and then directly use a copper wire brush or stainless steel wire brush with a diameter of 0.15mm~0.2mm until the metallic luster is exposed. Generally, it is not advisable to use a grinding wheel or ordinary sandpaper for sanding, so as to prevent the sand particles from staying on the metal surface and entering the molten pool during the wire drawing process to cause defects such as slag inclusion.
In addition, scrapers, files, etc. can also be used to clean the surface to be welded. After the workpiece and process are cleaned and cleaned, the oxide film will regenerate during storage, especially in a humid environment, in an environment contaminated by acid, alkali and other vapors, the oxide film will grow faster. Therefore, the storage time of the workpiece and wire drawing after cleaning and cleaning up to before wire drawing should be shortened as much as possible. Generally, the wire drawing should be done within 4 hours after cleaning in a humid climate. After cleaning, if the storage time is too long (more than 24h), it should be processed again.
2. Chemical cleaning: chemical cleaning has high efficiency and stable quality. The wire drawing process is suitable for cleaning small-sized and batch-produced workpieces. Two kinds of dipping method and scrubbing method are available. Use acetone, gasoline, kerosene and other organic solvents to degrease the surface. Use 5%~10% NaOH solution at 40℃~70℃ to wash for 3min~7min (the pure aluminum time is slightly longer but not more than 20min), rinse with flowing water, and then use Pickling with 30% HNO3 solution at room temperature to 60℃ for 1min~3min, rinse with running water, air-dry or low-temperature drying.
The above is the cleaning method of the brushed aluminum plate. The cleaning steps of the brushed aluminum plate are the basics. After all, the drawing process can be stronger and the quality of the finished product can be better.
Post time: Jul-05-2022
