There are many types of zinc alloys. In addition to casting zinc alloys are classified according to processing methods, they can also be classified according to composition, characteristics and uses:
(1) Classified by alloy composition: Zinc alloys can be divided into four categories according to composition, namely Zn-Al series, Zn-Cu series, Zn-Pstrong series and Zn-Pstrong-Al series alloys. The first class generally contains a small amount of Cu and Mg to increase strength and improve corrosion resistance. The second category is to engage in creep alloys, which generally contain Ti, that is, alloys based on Zn-Cu-Ti in actual use, and sometimes a small amount of Cr is added to further improve its creep resistance. The third category is that Zn-Pstrong series alloys are mostly used for punching battery shells and can be made into various hardware and sports equipment. The fourth category is Zn-Pstrong-Al alloy for galvanizing.
(2) Classification according to processing methods: Zinc alloys are simply divided into three categories according to processing methods. One is a cast alloy; the other is a deformed alloy; the third is a hot-dip galvanized alloy. Cast alloy middle forks can be divided into pressure casting alloys and gravity casting alloys according to different casting methods. Zn-Al alloys and Zn-Cu-Ti alloys can be cast directly and can also be deformed. Among them, the superplastic Zn-Al alloy has attracted great interest.
(3) Classified by performance and use:
1) Creep-resistant zinc alloy: Zn-Cu-Ti alloy, which can produce required parts through lead-zinc ore processing and deformation, or directly die-cast products.
2) Superplastic zinc alloy: Zn-Al binary alloy can exhibit extremely high elongation under certain structure and deformation conditions. It is unique for processing some complicated parts. From the 1970s, the United States, Britain, Japan and other countries began to vigorously study the superplastic phenomenon of zinc alloys. At present, it has obtained certain applications in industry.
3) Damping zinc alloy: This is a new type of structural material with great development prospects. It is also called shock-absorbing zinc alloy in China, which can reduce industrial noise and reduce mechanical vibration.
4) Mold zinc alloy: Zinc alloy molds were used in the early days of World War II and were called “simple molds”. This technology has successfully used lead-zinc ore production processes in the automobile manufacturing industry in Japan and some countries in Western Europe. The Japanese standard is named “Zinc Alloy for Stamping”, or ZAS.
5) Wear-resistant zinc alloy: Zinc alloy bearings have the characteristics of low friction coefficient, high affinity to oil, and excellent mechanical properties. As early as around 1940, Germany used zinc alloy instead of bronze as bearing material due to lack of copper.
6) Anticorrosive zinc alloys: including sacrificial anodes and zinc alloys used for sputtering, hot dip coating, etc.
7) Structural zinc alloys: Zn-Cu-Ti and Zn-AI alloys can be used to manufacture structural parts. The early Zn-Al die-casting alloys used a large amount in this regard, while the recently developed high-strength Zn-Al alloys The scope of application is expanding.
|Alloy name||Alloy grade||tensile strength MPa||Tensile elongation%||Hardness HB||Coefficient of friction||Linear expansion10-６／oC||Thermal conductivity C.S.C||Proportion g/cm3|
|Zinc alloy（Rare earth）||ZRH-8||420-450||80-130||0.05||26||0.24||4|
|Zinc aluminum alloy||ZA43||380-450||5||80-120||0.07||26||0.24||3.89|
|Aluminum base alloy||ALS8||200-220||70-90||0.004||26||0.35||2.8|
|Aluminum base alloy||B850||190-230||6-8||60-90||0.004||23.1||0.419||2.79|
|Aluminum base alloy||B852||210-230||5-9||50-95||0.004||22.8||0.42||2.81|
|Alloy||Compressive yield strength (MPa)||Shear strength (MPa)||Fatigue strength (5X108)MPa||Impact strength(J)|
|Alloy grade||tensile strength MPa||Tensile elongation%||Hardness HBS||Proportion g/cm3|