Alloy aluminum plates are now more and more widely used in people's lives. The following four main uses of alloy aluminum plates are introduced by American Airlines. I hope to help you with your purchase.
First, it costs a lot of heat.
Although the melting point of the alloy aluminum plate is low, the latent heat of melting is large, the heat is large, the blackness is small, and the reflection of heat is strong. Compared with other common metals such as iron and copper, the heat is consumed when melting.
Second, easy to oxidize.
Aluminum has a great affinity for oxygen and it oxidizes quickly to form Al2O3. The alumina film formed on the outer surface of the melt has a maintenance effect, but once it is damaged, the oxide film enters the melt and is difficult to remove. Since one Al2O3 is not easy to recover, the other is its density near the melt. It is suspended in the melt and enters the ingot with the melt, which has a helium effect on the quality of the material. More importantly, the oxide of the aluminum tread plate is a carrier for various gases, and its presence causes the aluminum to absorb a lot of hydrogen. Therefore, reducing oxidation as much as possible is an important issue in the melting process of alloy aluminum sheets.
Third, easy to inhale.
The alloy aluminum plate has a strong gettering performance (mainly the ability to absorb hydrogen), especially in a furnace gas with water vapor or a restorative atmosphere. Although the amount of hydrogen absorption of aluminum and aluminum alloys is not large, the solubility of hydrogen in the solid phase and the liquid phase differs greatly at the melting point, and the tendency of the ingot to crystallize and loose is large. Therefore, the alloy aluminum plate should be reduced in hydrogen absorption as much as possible.
Fourth, simply absorb metal impurities.
Some alloying elements in alloy aluminum sheets have high chemical activity, they not only absorb iron dissolved directly from iron lanthanum and things, but also can be displaced from many oxides of the lining and many chlorine salts of the flux. Metal impurities such as iron, silicon, and zinc. Once these metal impurities enter the aluminum melt, they cannot be removed. And the more the number of smelting, the higher the impurity content, the greater the influence on the alloy function, and the grade of pure aluminum is degraded when the temperature is severe, so that the alloy composition is overrun and is invalid. Therefore, it is necessary to avoid contamination of metal impurities during the melting of the alloy aluminum plate.