Summary of some (important) properties of zinc

  • As we all know, or at least we all know that at some point we have been in contact with this metal, zinc is grayish white or bluish white. It has a metallic luster, can take on a high gloss, and quickly tarnishes with ordinary air.
  • When zinc is crushed, its microstructure becomes homogeneous and its hardness increases. Annealing restores the crystal structure. Molten metal “cries” weaker than tin.
  • Zinc is brittle at normal temperatures, but becomes malleable and ductile between 100 °C and 150 °C. Metal is hot rolled on a large scale, but still malleable enough after heating to be able to re-roll or stretch it of wire. Above 205 °C, zinc is again brittle enough to be pulverized in a mortar.
  • Zinc has a clearly plastic behavior between 200 °C and 400 °C, and hot metal can be structed through an opening.
  • The density of zinc distilled at 20-24 °C is 6.9225 g / ml, increases to 7.12722 g / ml after compression by 10,000 atmospheres, but varies with the history of the metal and generally decreases with “work ”
    Schiff found that the density of granulated zinc at 12 °C varies between 6,966 to 6,975 g / ml, and recorded the determinations by other observers to vary between 6,861 to 7.1908 g / ml. According to Kalischer, a coiled zinc specimen of density 7.1812 has a density of 7.1841 when crystallizing between 130-300 °C.
  • The density of zinc decreases when melting according to the following expression: D = 6.59 – 0.00097 (T-419), for any temperature T. The slight contraction during solidification adapts the metal to the castings.
    The vapor density of zinc corresponds to a monatomic molecule. When zinc dissolves into mercury, it depresses the vapor pressure as if its molecule were monatomic.
  • Zinc melts at 419.4 °C. The latent heat of fusion of zinc is approximately 1,730 Cal.
  • Berthelot found that 920 °C is the boiling point of zinc. Previous researchers had found higher temperatures. It has recently been assigned 918 °C as the boiling point.
  • In a vacuum, zinc slowly volatilizes at 184 °C and boils at 550 °C. According to Heycock and Lamplough, the boiling point is altered by 0.133 °C per mm. difference from normal pressure.
  • Thermal conductivity decreases with temperature to its melting point. Subsequently there is a sharp decline followed by another gradual increase. According to Lees, the thermal conductivity of redistilled and pure molten zinc ranges from 0.20 to -170 °C to 0.268 to 18 °C. According to Jager and Diesselhorst, it is 0.265 to 18 °C for pure molten zinc and 0.262 to 100 °C.
  • The linear expansion coefficient is 10.06 × 10-6 between -183 °C and 12.6 °C, and 17.11 × 10-6 between 19.3 °C and 100.2 °C.

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