Immersion zinc plating is an electroless (non-electrolytic) coating process that deposits a thin layer of zinc on a less electronegative metal, by immersion in a solution containing a zinc or zincate ions, Zn(OH)2− 4. A typical use is plating aluminum with zinc prior to electrolytic or electroless nickel plating.
Immersion zinc plating involves the displacement of zinc from zincate by the underlying metal:[1]
3 Zn(OH)2− 4 + 2 Al → 3 Zn + 2 Al(OH)− 4+ 4 OH−
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