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Zincate

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In chemistry the term zincate may refer to

Contents

  • a salt containing Zn(OH)42−,also called the tetrahydroxozincate ion. It is an ore of Zinc. Examples include calcium zincate CaZn(OH)4.2H2O or Na2Zn(OH)4 or the polymeric anion [Zn(OH)3−] in for example NaZn(OH)3· H2O
  • an alkali solution prepared from dissolving zinc metal, zinc hydroxide or zinc oxide which contains various anionic species such as Zn(OH)42−. Such solutions are used in the plating industry.
  • an oxide containing zinc and a less electronegative element e.g. Na2ZnO2,(see -ate complex).
  • a commercially available zinc supplement formulated as zinc sulfate.

    • Zincate - plating processes

    In industry it can refer to the alkaline solutions used in a dipping (immersion) process to plate aluminium with zinc prior to electrolytic or electroless nickel plating. This immersion process is electroless (i.e. not electroplating) and involves the displacement of zinc from zincate by aluminum:

    3 Zn(OH)42− + 2 Al → 3 Zn + 2 Al(OH)4− + 4 OH−

    It can also refer to alkaline solutions used in electroplating of e.g. steel with zinc.

    Inorganic compound nomenclature

    In the naming of inorganic compounds zincate is a suffix that indicates that a polyatomic anion contains a central zinc atom. Examples include tetrachlorozincate, ZnCl42−, the tetrahydroxozincate, Zn(OH)42− and tetranitratozincate, Zn(NO3)42−. More recent recommendations (2005), that are not widely used, would call the first two ions tetrachloridozincate(2−) and tetrahydroxidozincate(2−) respectively.

    Zincates aqueous chemistry

    It is now generally accepted that the ionic species in alkali solutions of ZnO or Zn(OH)2 contain Zn(OH)42−. Earlier Raman studies had been interpreted as indicating the existence of linear ZnO22− ions.

    References

    Zincate Wikipedia
    (Text) CC BY-SA


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