dezincification

/D IH0 Z IH1 N S AH0 F AH0 K EY1 SH AH0 N/
noun
  1. 1

    The act or process of freeing from zinc.

  2. 2

    The undesirable removal of zinc from zinc-containing alloys by a chemical reaction, as when red rot occurs in brass due to presence of acids.

Source: https://en.wiktionary.org/wiki/dezincification