First, the composition is different.
1 and No.2 zinc alloys have the highest copper content, reaching 2.7%~3.3%.
Zinc alloys No.2 and No.3 have the lowest copper content, below 0.03%.
The copper content of No.3 and No.5 zinc alloys is moderate, ranging from 0.7%~ 1. 1%.
4. The main components of zinc alloy are: zinc, copper, aluminum, magnesium, iron, lead, cadmium and tin. No.2, No.3 and No.5 zinc alloys contain the same elements except zinc and copper, including aluminum 2.8%~4.3%, magnesium 3.5%~6%, iron less than 2%, lead less than 0.3%, cadmium less than 0.3% and tin less than 0. 1%.
Second, the performance is different.
/kloc-No.0/and No.2 zinc alloys: used for mechanical parts with special requirements on mechanical properties, high hardness, good wear resistance and general requirements on dimensional accuracy.
Zinc alloys No.2 and No.3: Good fluidity and mechanical properties. It is suitable for castings that do not need high mechanical strength.
No.3.5 zinc alloy: good fluidity and good mechanical properties. Suitable for castings with certain requirements on mechanical strength.
Third, the use is different.
1, No.2 zinc alloy: No.2 zinc alloy has the highest hardness and strength among all kinds of zinc alloys. Its copper content (3%) is effective in creep resistance (deformation under high temperature stress) and wear resistance. No.2 zinc alloy is used for gravity casting, such as making metal molds or injection tools.
No.2.3 zinc alloy: The castability and size are durable and stable, which makes more than 70% of zinc alloy die-casting products adopt No.3 zinc alloy. Surface treatment of No.3 zinc alloy such as electroplating, painting and chromium plating. Products are widely used in automobiles, motorcycles, electronic communications, instruments and other mechanical parts; And toys, ornaments, tableware, locks and other advanced hardware devices.
3,5 zinc alloy: the change of characteristics is due to the addition of 1% copper. This alloy has excellent castability and better creep resistance (deformation when heated at high temperature) than No.3 zinc alloy. It can be used for electroplating, cutting and general surface treatment, and is suitable for sports equipment and industrial accessories.
Extended data:
zinc alloy
1, Introduction:
Zinc alloy is an alloy based on zinc and added with other elements. The alloying elements usually added are low-temperature zinc alloys, such as aluminum, copper, magnesium, cadmium, lead and titanium.
2. Type:
Traditional die-casting zinc alloys include No.2, No.3, No.4, No.5 and No.7 alloys, among which No.3 zinc alloy is the most widely used. In 1970s, high aluminum zinc-based alloys ZA-8, ZA- 12 and ZA-27 were developed.
3. Classification:
Zinc alloy, also known as zinc-based alloy, is generally divided into binary alloy, ternary alloy and multicomponent alloy. Binary zinc-based alloys generally refer to zinc-aluminum alloys; Ternary zinc-based alloys generally refer to zinc-aluminum-copper alloys; Multicomponent alloys generally refer to trace metals such as zinc, aluminum and copper.
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