Regardless of the type of reactor (boiling water reactor, pressurized water reactor, gas cooled reactor and fast neutron reactor) used in nuclear power plants, a certain amount of aluminum profile etc material are used. In the nuclear industry, aluminum is mainly used as a cladding of medium and low temperature reactor fuel components, process tubes, auxiliary rib pipes, etc. Industrial pure aluminum is widely used in water-cooled reactors with a temperature of 100 ° C ~ 130 ° C.
As the encapsulating material of the 8001 aluminum coil and the 6063 aluminum pipe tube tubing , in the process of producing, transportation and installation, the surface will inevitably produce various local damages such as scratches, bumps, oxide film defects, etc. Make them accelerate corrosion. However, as long as the damage depth is ≤ 0.3 mm, abnormal accelerated corrosion is not caused. At the same time, aluminum can be safely used under certain conditions of low temperature water reactors. Some factories in China use the white cloth bag to pack anodized 6063 aluminum pipe tube tubing, and transport it to the user with a special car to prevent damage.
In medium temperature water, aluminum is dominated by uniform corrosion. Therefore, the effect of ions in water on corrosion is not as significant and sensitive as at low temperatures, while alloy composition, grain size and microstructure play a considerable role. It is not preferable to have excess silicon in the Al-Mg-Si 6063 alumimnum pipe tube tubing and Si and Mg should all form Mg2Si, that is, the Mg/Si content = 1.736463 alloy is one such alloy. Adding an equal amount of iron and nickel (0.3% to 0.4%) to the alloy forms an Al9FeNi phase, which improves the corrosion resistance of the alloy.
