What should be used to clean the oxidation of aluminum parts to remove the surface oxide, how to prevent oxidation again

1, chemical cleaning

High chemical cleaning efficiency, stable quality, suitable for cleaning welding wire and small size, batch production of the workpiece. Available dip method and scrub method two kinds.

Acetone, gasoline, kerosene and other organic solvents can be used to remove oil on the surface, using 5%-10% NaOH solution of 40℃ ~ 70℃ alkaline washing for 3 min ~ 7 min(pure aluminum time is a little longer but not more than 20 min), rinse with flowing water, and then pickling with 30% HNO3 solution of room temperature to 60℃ for 1 min ~ 3 min, rinse with flowing water. Air drying or low temperature drying.

2, mechanical cleaning

Mechanical cleaning is often used when the workpiece size is larger, the production cycle is longer, and the multilayer welding or chemical cleaning is contaminated. First use acetone, gasoline and other organic solvents to wipe the test surface to remove oil, then directly use 0.15mm ~ 0.2mm diameter copper wire brush or stainless steel wire brush, brush until the metal luster is exposed.

Generally, it is not suitable to use grinding wheel or ordinary sandpaper to avoid sand particles left on the metal surface and slag inclusion and other defects when entering the molten pool during welding. In addition, scraper and file can be used to clean the welding surface.

Workpiece and welding wire after cleaning and cleaning, in the storage process will re-produce oxide film, especially in the humid environment, in the environment of acid, alkali and other vapor pollution, oxide film growth faster.

Therefore, the workpiece and welding wire cleaning and cleaning before the storage time should be as short as possible, in the humid climate, generally should be cleaned within 4 h after welding. After cleaning, if the storage time is too long (such as more than 24 h), it should be reprocessed.

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