Aluminum alloy pipe is a kind of non-ferrous metal pipe, which refers to the metal tubular material that is extruded from pure aluminum or aluminum alloy to be hollow along its longitudinal full length. There can be one or more closed through holes with uniform wall thickness and cross-section, and they can be delivered in a straight line or in a roll. It is widely used in automobile, ship, aerospace, aviation, electrical appliances, agriculture, electromechanical, household and other industries. Aluminum alloy pipe is a kind of non-ferrous metal structural material with strong applicability, which can be used in many occasions. It is an important industrial material. Its advantage lies in its plasticity. Aluminum has a very special structure. The leakage is caused by corrosion. No matter whether the carbon steel pipe is installed by threading or welding, the corrosion always begins at the wire mouth and welding scar.

Therefore, some enterprises, especially the electronics, pharmaceutical and spraying industries, will choose to use stainless steel pipes to avoid the secondary pollution caused by pipe rust and the risk of corrosion and leakage. However, the cost of stainless steel pipes is relatively high, and their wide application is limited to a certain extent. The long-term use of the air storage tank or after many years of use will inevitably cause rain, air or humid atmospheric corrosion, which is caused by the action of water, oxygen, acidic pollutants and other substances in the atmosphere.

It is a common atmospheric corrosion phenomenon that steel rusts in the atmospheric natural environment. Wet atmospheric corrosion. It refers to the corrosion of metal under the thin film layer invisible to the naked eye. At this time, there is water vapor in the atmosphere. When the water vapor concentration reaches the critical humidity (the critical humidity of iron is 65%, and the critical humidity of copper is close to 1 00%), there is a very thin water film on the metal surface, and uniform corrosion will occur. If there are pollutants such as CO2, H2S and SO2 in the atmosphere, the corrosion will be significantly accelerated. The corrosion of steel under atmospheric conditions is actually electrochemical corrosion under water film conditions.