(1) AL-Si (AL-SI-Mg) alloy is called silicon-aluminum alloy in the industry. It has good casting properties, good corrosion resistance, medium strength and easy to use at high temperatures. It can be used to produce various types of complex castings. The addition of an appropriate amount of magnesium to the aluminum alloy enables the alloy to be strengthened by heat treatment.
(2) AL-Cu (AL-SI-Cu) alloy, which can be heat-treated and has high strength and plasticity, but has poor corrosion resistance and new casting energy. Easy to manufacture working parts at higher temperatures. The addition of silicon to aluminum alloys improves casting properties and reduces hot brittleness, extending the range of applications.
(3) AL-Mg alloys have good corrosion resistance and weldability higher than AL-Si alloys. They are widely used in the shipbuilding, video and chemical industries for berths, but have poor resistance and casting properties.
(4) AL-Zn (and AL-ZN-Mg) alloys, which have a natural aging tendency and are suitable for the manufacture of castings with high dimensional stability, but have poor corrosion resistance and low heat resistance.
Among the above-mentioned various types of cast aluminum alloys, magnesium-aluminum alloys have the best corrosion resistance, are easy to be anodized, and are often used in corrosive media; however, due to their poor castability and heat resistance, the application range is limited. The corrosion resistance of the aluminum-silicon alloy is centered in the aluminum alloy, and the casting performance is good and the strength is medium, so it is the most widely used. Aluminum-copper-based aluminum alloys have the worst corrosion resistance, but have excellent mechanical properties at room temperature of pyrometers, and are easy to manufacture parts that are used at high temperatures or with large loads.
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