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Materials and processes for anti-rust aluminum alloy castings and why they are refined
- Sep 10, 2018 -

The rust-proof aluminum alloy used in the anti-rust aluminum alloy castings is mainly composed of an aluminum-magnesium-based aluminum alloy, an aluminum-manganese-based aluminum alloy, and an industrial pure aluminum. This kind of aluminum alloy has good rust and corrosion resistance, referred to as rust-proof aluminum. In addition, it has good plasticity and weldability, and is especially suitable for press working and welding. However, it cannot be heat-treated and strengthened, so it is not very good in mechanical properties, but other methods can be used for strengthening.


Aluminum-magnesium-based aluminum alloy: Magnesium is the main element of this alloy, and there are also a small amount of such elements as manganese and titanium. Moreover, the high content of magnesium, which affects the mechanical properties of the alloy, such as alloy strength and plasticity. The relationship between the two is proportional.

Aluminum-manganese-based aluminum alloy: its common alloy grade is 3A21. Manganese is its main constituent element. In the manganese content, it should be controlled within the range of 1%-1.6%, which can make the material have higher plasticity and strength. , as well as good soldering and corrosion resistance, but if it exceeds this range, it will have adverse effects. In addition, this aluminum alloy cannot be aged.


Anti-rust aluminum alloy castings, because of the lower melting point of aluminum alloys, in the casting method, metal and pressure casting are used to improve the intrinsic quality, dimensional accuracy and surface finish of the castings. In addition, the production efficiency can be improved. . Based on some characteristics of rust-proof aluminum alloys and aluminum alloys, castings are suitable for thin-walled and structurally complex castings.


The refining of anti-rust aluminum alloy castings is mainly to refine the aluminum alloy material to remove gases and non-metallic inclusions in the alloy liquid. Its gas is mainly hydrogen, while the inclusions are mainly alumina. Moreover, if this operation is performed, the problem of pinholes in the casting can be avoided. Moreover, the degassing must be slag removal, and the slag removal is the basis of degassing.