Selective dissolution of an amorphous Mg65Cu25Y10 alloy in organic acids and dilute HCl solution

Fengxiang Qin, Zhenhua Dan, Nobuyoshi Hara, Weirong Li, Yangde Li

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Selective dissolution behavior of an amorphous Mg65Cu25Y10 precursor alloy in organic acids has been investigated. Nanoporous copper (NPC) with a pore size of 11-19 nm and ligament of 16-19 nm is obtained after dealloying in 0.01 M formic and acetic acids. NPC formed in formic acid has a larger pore size and similar ligament size than that in acetic acid. Plot of nanopore size versus dealloying time demonstrates the formation of NPC is controlled by the surface diffusion of Cu adatoms. Low diffusion ability of anions with more C-H chains from organic acids results in the formation of finer NPCs. On the other hand, NPC is unable to form in 0.01 M HCl solution and corrosion products consist of Y2O3, Y(OH)3, Mg(OH)2 and metallic Cu. The thick corrosion products passivate the surface to prevent from the further aggregation of corrosion. The formation of the finer NPC in organic acids benefits from slow surface diffusion of Cu adatoms, the buffer ability of the organic solutions and the low mobility of the organic molecule.

Original languageEnglish
Pages (from-to)27-34
Number of pages8
JournalMaterials Chemistry and Physics
Volume179
DOIs
Publication statusPublished - 2016 Aug 15
Externally publishedYes

Keywords

  • Amorphous materials
  • Corrosion
  • Etching
  • Microporous materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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