Analysis of Oxidation and Blackening of 7075-T651 Aluminum Alloy Mould
The aluminum aerospace aluminum imported from Kaiser 7075-T651 is used in the United States. It is used in blow molding molds. Why does the problem of oxidative blackening of the material appear after processing, which leads to the need to wipe off the black oxide film before using it every time? Use, very time consuming, trouble?
Kaiser aluminum plant reply: aluminum alloy is very sensitive to water environment, it is easy to corrode, 7075-T651 is the worst anti-corrosion product in aluminum alloy, the dirt on the surface of the material will increase the probability of serious damage in water.
If aluminum must be in contact with water, it is important to dry the aluminum alloy thoroughly and quickly to avoid corrosion. In addition, if the aluminum alloy is exposed to moist air, it can easily corrode.
On the other hand, it is the choice of cutting fluid. Because aluminum is very active and easy to react with acid and alkali, it is necessary to use the cutting fluid of Ph=7 when selecting the cutting fluid, and avoid the aluminum alloy in the cutting fluid during processing. The soaking time is too long to avoid chemical corrosion and corrosion of the material.
Once the product is corroded, erasing the oxide is the only way. Intergranular corrosion occurs because of the lack of the brand name 7075-T651.
Tag: 7075-T651 7075 aluminum Aviation aluminum alloy