Prepare 1 before welding, soldering before cleaning: aluminum and aluminum alloy welding, should be strictly removed before welding oxide film and the oil of the workpiece and the wire surface weld; 1) chemical cleaning chemical cleaning high efficiency, stable quality, suitable for clean-wire and Size small, mass-produced parts. Available in two French immersion method and scrubbing. Available surface organic solvent acetone, gasoline and kerosene to oil, with a 5% ~ 10% NaOH solution Caustic 40 ℃ ~ 70 ℃ of 3 min ~ 7 min (aluminum take longer but no more than 20 min) aluminum products processing pieces , mobile water rinse, followed by a room temperature to 60 ℃ of 30% HNO3 acid solution 1 min ~ 3 min aluminum products processing, mobile wash, air dry or low temperature drying. Aluminum was once used to make cooking utensils, and very popular, because aluminum pots and other rust, aluminum layer of dense air will react with oxygen to form an aluminum oxide film, however, scientific evidence, aluminum tableware is not used cooking or prolonged storage of acidic, alkaline and salty foods, because acid salt, etc. can be directly etched aluminum surface of the protective film and aluminum products themselves. The study found that the aluminum elements can damage a person's brain cells. According to the assessment of the World Health Organization, the daily intake of aluminum is specified 0 ~ 0.6mg / kg, where kg refers to a person's weight, that is, a 60kg human intake of 36mg. China's "food additive standard GB2760-2011" stipulates that the residual amount of aluminum is less than or equal to 100mg / kg. Of aluminum in the human body is slowly accumulates, toxicity which causes the slow and imperceptible led aluminum products processing, however aluminum products processing price, once toxicity metabolic disorders occur, the consequences are very serious. Therefore, we must draw our attention, in their daily lives to prevent the absorption of aluminum, reducing the use of aluminum products. Therefore aluminum cookware has been gradually phased out. [Aluminum products processing parts, gold-precision (certified), aluminum products processing provided by Foshan Jin Precision Parts Co., Ltd., Huizhou. Huizhou Hing Precision Parts Co., Ltd. (hzjxbp.com) (www.hzjxbp.com) is an industry leader in Huizhou, Guangdong, the standard mold, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer demand. In the gold-Precision leadership with the staff warmly welcome all inquiries negotiations to create a gold-precision better future.