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Abstract

The nanoporous metal is fabricated by means of hybrid laser processing in combination with electrochemical dealloying. Cu-Mn alloy coatings with fine shape, low dilute ratio and refined microstructure are fabricated on medium carbon steel by means of laser processing. Polarization curve indicates that the Cu-Mn alloy shows selective dissolution characteristics for different electrolytes. Nanoporous Cu and nanoporous Mn are fabricated with optimal electrochemically dealloying parameters. Nanoporous Cu has pore sizes rangeing from 30 to 50 nm, while the surface morphology of the porous Mn shows a ribbon-like structure with ultrahigh roughness factor up to 900. Finally, the potential-pH diagram is used to explain the mechanism of the dealloying.

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1.
Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 90923021), the Independent Scientific Research Plan of Tsinghua University (Grant No. 2010THZ0), and the Key Program for Science and Technology Project of Beijing Municipal Education Commission (Grant No. KZ201110005001).

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Vol. 61, Issue 9 - 2012-05-05

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