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

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

研究成果: Article査読

5 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)27-34
ページ数8
ジャーナルMaterials Chemistry and Physics
179
DOI
出版ステータスPublished - 2016 8月 15
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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