中文摘要：

通过激光加工结合电化学腐蚀脱合金法,成功实现了纳米多孔涂层的制备。首先在45#钢表面制备了成形良好、稀释率低的Cu-Mn合金熔覆层。采用激光快速重熔工艺对初始材料组织进行细化,并对不同微观组织的合金涂层进行脱合金处理。研究表明,通过电化学腐蚀工艺的选择与优化,使惰性元素Cu优先溶解,成功实现了纳米多孔Mn涂层的制备。初始材料组织的细化与成分的均匀化显著提高了Cu-Mn合金涂层的纳米多孔成形能力。优化工艺条件下,纳米多孔Mn涂层呈现出三维连通的网状多孔结构特点,多孔结构厚度达到2μm。

英文摘要：

Fabrication of nanoporous coatings is investigated by a two-step process involving high power laser cladding of homogeneous Cu40Mn60 alloy coatings followed by selective electrochemical de-alloying.Cu-Mn alloy coatings with fine shape,low dilute ratio and refined microstructure are fabricated on mild steel by means of laser processing.The second dendrite arm spacing（SDAS） decreases with the increase of laser remelting speed.Auger mapping results indicate that nanoporous manganese is obtained by selective electrochemical etching of the less active Cu component owing to the passivation of the more active manganese in potassium nitrate solution.The microstructure and homogeneity of the precursor Cu40Mn60 alloys have a significant influence on the evolution of nanopores during selective electrochemical de-alloying.The surface morphology of the porous Mn is a ribbon-like structure with thickness up to 2 μm.