Laser Hybrid Fabrication of Nanoporous Structures on Metallic Material Surface
Abstract
This paper reports a novel approach to fabricate Cu-Mn nanoporous structures by laser deposition hybrid with electrolyte dealloying. Cu25Mn75 alloy layers free of cracks were fabricated by laser deposition onto a mild steel surface. The dendrite microstructure of the as-deposited layer was further processed by laser remelting to refine the grain size and change the morphology to be cellular crystalline. Electrolyte dealloying was then applied on the as-deposited and remelted layers. Uniform porous microstructure will form under optimized electrode current density to be about 5 mA/cm(2). The size of the porous structure decreases with the increase of laser remelting speed. Nanoporous structure is available with remelting speed up to 83 mm/s. A minimum size of nanoporous structure was achieved to be 35.2 nm up to date with this laser dealloying hybrid method. The Nanoporous Cu-Mn structure was further electrolessly plated of Ni to form a nanoporous Cu-Ni composite coating. The Cyclic voltammetry curves indicate that both the nanoporous Cu coatings and the nanoporous Cu-Ni composite coatings show electrochemical catalysis properties. The Cu-Ni composite coatings with 20 minute Ni plating demonstrates the best catalysis properties,with oxidation peak current density up to about 60 mA/cm(2).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2009
- Accession Number
- ADA540281
Entities
People
- Changsheng Dong
- Hongjun Zhang
- Mingxing Ma
- Minlin Zhong
- Wenjin Liu
- Yide Kan
- Yu Gu
Organizations
- Tsinghua University