Mechanical cleaning: the workpiece size is larger, longer production cycle, multi-layer welding or chemical cleaning after contamination, often by mechanical cleaning. With acetone, gasoline and other organic solvents to wipe the surface of the oil, followed directly with a diameter of 0.15 mm ~ 0.2 mm copper wire brush or stainless steel wire brush, 6061T6 aluminum, brush to the exposed metallic luster so far. Generally should not use the wheel or ordinary sandpaper, in order to avoid sand left on the metal surface, into the bath defects such as slag generated during welding. There is also available scraper, rasp and other clean-up surface to be welded. Acid in rust contamination aging process, specializing in the production 6061T6 aluminum manufacturers, we will continue to bring oil or other impurities, which suspended impurities can be removed by scraping fishing methods; when soluble iron exceeds a certain content, Jinan 6061T6 aluminum manufacturers, rust effect will not only greatly reduce the bath, and an excess of iron ions with the surface of the mixed phosphate residue tank, accelerated aging phosphate bath pollution, seriously affecting the quality of the workpiece phosphate, general acid Liquid iron content should be controlled at no more than 6% to 10% is appropriate. Bath must be replaced when more than control targets.