The presence of the oxide film on aluminum and aluminum side also has a protective effect. Because of its relatively dense tissue, strong adhesion to aluminum, can prevent oxidation of aluminum metal to continue to protect the metal from damage. And higher purity aluminum, against the more favorable corrosion. Because the presence of impurities, in addition to affecting the oxide film and the metal adhesion, but also may cause other forms of corrosion. According to this characteristic of the oxide film, the oxide film for can promote the generation, it does not work with media, such as nitric acid, cerotic acid, etc., often aluminum as a storage container, while the film does damage aluminum medium 7075 Which is good quality pipe, such as hydrochloric acid, alkali and salt, etc., because it can quickly destroy the oxide film, the aluminum tubes corrode 7075 supply manufacturers, is strongly corrosive aluminum, so this type of storage media can not be used as a container of aluminum . . Squeezing pressure is too low, then the lower weld together. Squeeze caused by low pressure factor is integrated, there are factors that have mold on the process. There are several situations: a squeeze relatively low. To improve the welding together can take the following methods: 1 / thickening of the upper mold 2 / porthole appropriately reduced 3 / extrusion temperature appropriate to reduce the normal hollow profile extrusion temperature of 460-500 ℃ 7075 aluminum prices, can be reduced 420-440 ℃. This method is very useful in the field. 4 / choose a larger extruder barrel, about to squeeze the profile arrangement on the larger models. 5 / welding chamber depth and selection (by the shunt bridge "sink" approach). But pay attention to Shen bridge will reduce extrusion pressure, thus making this method when you want, depending on the circumstances. For the use of "+ yu" shunt-mode bridge structure more effective. 7075 aluminum tubes supply manufacturers _7075 _ cis cis Alcoa Aluminum Co., Ltd. is provided by Jinan. Jinan Heshun Aluminum Co. (www.jnhsly.com) strong, credible, in Jinan, Shandong aluminum products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead rolls in aluminum and you hand into the brilliant, for a better future!