Aluminum is lighter in specific gravity, less rebound in forming, higher strength, close to or more than high-quality steel, good plasticity, product forming is more complex, easier to control than stainless steel, has excellent electrical conductivity, thermal conductivity and corrosion resistance, and at present, the surface treatment process of anodic oxidation of aluminum, brushed, sandblasted and so on has been very mature, and the use of aluminum in the cell phone is also very much.
According to the aluminum alloy according to the processing method can be divided into deformed aluminum alloy and casting aluminum alloy, aluminum and aluminum alloy number is mainly divided into eight series.
Alloy grade expression method
International grade number (with four Arabic numerals, now commonly used expression method):
1XXX for more than 99% of the pure aluminum series, such as 1050, 1100
2XXX means aluminum - copper alloy series, such as 2014
3XXX means aluminum - manganese alloy series, such as 3003
4XXX means aluminum-silicon alloy series, such as 4032.
5XXX indicates that it is aluminum-magnesium alloy series, such as 5052.
6XXX means aluminum-magnesium-silicon alloy series, such as 6061, 6063
7XXX means aluminum-zinc alloy series, such as 7001.
8XXX indicates an alloy system other than the above.
One series
Among all the series, 1000 series belongs to the series with the most aluminum content, and the purity can reach over 99.00%. 1000 series aluminum plates determine the minimum aluminum content of this series according to the last two Arabic numerals, for example, the last two Arabic numerals of 1050 series are 50, and according to the principle of international brand naming, the aluminum content must be over 99.5% to be qualified products.
A series of aluminum forming, surface treatment of good, in the aluminum alloy with the best corrosion resistance. Its strength is low, and the higher the purity, the lower the strength.
Cell phone commonly used to 1050, 1070, 1080, 1085, 1100, do simple extrusion molding (not bending), of which 1050 and 1100 can do chemical sanding, glossy, matte, normal effect, there is a more obvious material texture, coloring effect is good; 1080 and 1085 mirror aluminum commonly used to do the bright characters, matte effect, no obvious material texture.
A series of aluminum are relatively soft, mainly used for decorative parts or interior parts.
Series II
Characterized by higher hardness, but poor corrosion resistance, which is the highest content of copper primary genus, 2000 series aluminum alloy on behalf of the 2024, 2A16, 2A02. 2000 series aluminum plate copper content in the 3%~5% or so.
2000 series aluminum bar belongs to the aviation aluminum, as the construction of the material used, currently in the conventional industry is not often used.
Three series
3000 series aluminum rods are made of manganese as the main component. 3000 series aluminum alloys represent 3003, 3105, 3A21 mainly. The content is 1.0~1.5, it is a series with better anti-rust function.
Commonly used for liquid products tanks, tanks, building processing parts, construction tools, a variety of lamps and lanterns parts, as well as thin plate processing of various pressure vessels and pipelines. The molding, solubility, and corrosion resistance are good.
Four series
Usually silicon content of 4.5% to 6.0%, containing silicon higher strength is relatively high, 4000 series aluminum bar on behalf of the 4A01, 4000 series of aluminum plate belongs to the series with high silicon content. Soup flow is good, solidification shrinkage is less, belongs to the building materials, mechanical parts, forging materials, welding materials; low melting point, good corrosion resistance, heat-resistant, wear-resistant properties.
Five series
5000 series aluminum bar belongs to the more commonly used alloy aluminum plate series, the main element is magnesium, containing magnesium in 3% ~ 5%. 5000 series aluminum alloy on behalf of 5052, 5005, 5083, 5A05 series. It can also be called aluminum-magnesium alloy. The main features are low density, high tensile strength and high elongation. In the same area under the weight of aluminum-magnesium alloy is lower than other series, in the conventional industry is also more widely used.
The most commonly used in cell phones is 5052, the most representative alloy for the medium degree of strength, corrosion resistance, solubility and good formability, especially high fatigue strength, seawater resistance, commonly used to do the strength of the products require high, but its coloring effect is less desirable, suitable for doing sandblasting process, is not suitable for doing chemical sanding, matte surface, etc., the main use of casting molding molding methods, is not suitable for extrusion molding.
Six series
6000 series aluminum alloy on behalf of 6061 mainly contains magnesium and silicon two elements, so the concentration of the 4000 series and 5000 series of advantages 6061 is a cold treatment of aluminum forging products, suitable for anti-corrosive, oxidation requirements of high applications. Good serviceability, easy coating and good workability.