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Item # ZA12, Zinc Alloy


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Mechanical Properties of Aluminum Zinc ZA12  · Strength at elevated temperatures  · Physical Properties  · Machinability  · Corrosion Resistance  · Anodizing  · Application and General Notes

Mechanical Properties of Aluminum Zinc ZA12

Tensile Strength

299 MPa

Elongation

1.5 %

Brinell Hardness

94

Impact Strength at 20°c

26 J
19.2
ft-lb


Strength at elevated temperatures
Due to its low melting temperature ZA12 is not recommended for components whose service temperature exceeds 100°C. Strength will decrease with an increase of temperature from 20°C. In addition reference should be made to ZA12 mechanical properties at elevated temperatures and to the alloy's creep properties for continually stressed components.



Physical Properties

Coefficient of Thermal Expansion @ 20-100°C

0.0000028 per °C

Thermal conductivity @ 25°C

0.21 cal/cm2/cm/°C

Electrical conductivity @ 20°C

25 % copper standard

Freezing range

430 - 380 ºC


Machinability
This alloy has excellent machining characteristics, which means fast, efficient machining and long tool life. Therefore, unlike its competing materials, it is an ideal alloy for components requiring substantial or difficult machining.



Corrosion Resistance
Aluminium zinc casting in this alloy produces good corrosion resistance but weathering will turn the surface grey in colour, therefore, for decorative purposes it should be lacquered, plated or painted, and for more corrosive environments chromating or zinc anodizing should be considered.



Anodizing
A process for anodizing zinc and zinc alloy die casting has been developed and is reported to give excellent resistance to salt water and good resistance to abrasion. The finish is available only in matt light green, grey and brownish tints. The treatment is covered by U.S. Government specification MIL-A-81801.



Application and General Notes
With its excellent mechanical and physical properties aluminium zinc alloy ZA12 has a whole range of potential applications from stressed functional components (because of its high tensile strength, hardness, bearing properties and pressure tightness), to purely decorative thin wall components because of its ease of electro-plating and painting.



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