The history of zinc. Mechanical and physical properties of alloys of zinc.
The symbols in the table: die casting,-K; casting in sand molds — P; injection molding-D.
|Method of casting||Brand alloys||Elongation, %||Temporary resistance, MPa (kgf/mm2)||Hardness, HB|
|K||On CA4, CA4||1,8||256 (26)||70|
|CD||ZnA14Cu1A, CA4M1 Oh, CA4M1||1,01,7||215 (22)270 (28)||8080|
|P||CA4M3 about||1,0||235 (24)||90|
|D||ЦА8М||1,51,5||235 (24)270 (28)||7090|
|CD||CA30M5||8,01,0||435 (44)370 (38)||115 115|
Physical characteristic properties of zinc casting alloys in accordance with GOST 25 140−93.
|Grade||Specific heat at 20 °C, j/kgkh grad-1||Temperature coefficient of linear expansion in the temperature range 20−100 °C, a x10−6, deg-1||The temperature range of solidification,°C||Density (kg/m3) x10−3||Thermal conductivity, W/m x deg-1|
Soldering and welding
Zinc alloys can be joined, as by soldering, and welding. But technologically these processes are primarily used to eliminate surface defects, as soldered and welded joints have low strength. Lead-tin solders, it is possible to seal only Nickel plated parts with flux — acidified zinc chloride. Good results has solder, which contains 17.5% of Zn + 82.5% of Cd. In this embodiment, does not require flux. Carry out welding in a reducing flame, using additives from the same alloy as welded products.
They are widely used for casting carburetor housings in the automotive industry: parts hydrocortisol, speedometers, pumps, radiator grilles, as well as in other production sectors and household equipment for moulded parts instruments, valves, etc., These alloys cannot be applied in low and high temperatures, because at t°100°C and their hardness is reduced by 40%, strength 30% and at a temperature below 0 °C, the alloys become very brittle.
Such coatings are applied to the products not only to increase the resistance to corrosion but also for decorative purposes. Depending on the operating conditions use protective 2 — and 3-layered coating of different thickness. As alternative coatings generally used Nickel, chromium and copper.
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