Strength at elevated temperatures

The advantage of a comparatively low melting point which allows zinc die casting to such close dimensional limits entails the disadvantages that zinc alloys cannot be used at elevated temperatures.

In cases where the temperature is likely to be maintained for considerable periods of time, the maximum temperature recommended is 150°C for unstressed parts and 100°C when light stresses are involved. Where a zinc die casting is to operate under continual stress, and changes in dimensions are critical, creep data should be consulted.

MACHINABILITY

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

CORROSION RESISTANCE

A die casting in this zinc alloy possesses good resistance to corrosion. In general, its behaviour may be expected to resemble that of unalloyed zinc, and a zinc die casting may be used with confidence wherever the latter is known to be satisfactory.

ANODISING

A process for anodising zinc and zinc alloy die castings 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.

APPLICATIONS AND GENERAL NOTES

ZL3 is a general purpose alloy which can be used for a variety of applications, on a hot chamber pressure die casting machine. Its mechanical and physical properties make it ideal for use in die castings for the engineering and automotive industry, household equipment and utensils, office equipment, builder's hardware, locks, toys, giftware, etc. It is easily machined, buffed, polished, lacquered and electro-plated for decorative or functional purposes.