Morphologies and corrosion resistances of electroless Ni-P coated nanoporous coppers

Abstract

In order to improve the corrosion resistance of nanoporous coppers (NPCs), the electroless Ni-P coated NPCs were prepared in plating solutions with different pH values (5, 8, 11) and complexing agent (actic acid, citric acid). The morphologies and corrosion resistances of the as-prepared samples were investigated. The results showed that the double complexing agent composed of lactic acid and citric acid is relatively suitable for preparing the Ni-P coated NPC with three-dimensional continuous interpenetrating ligament-channel structures, and the uniform ligaments and nanoporous channels could be obtained at pH8. The Ni-P coated NPC showed higher corrosion potentials than NPC in H2SO4, NaOH and NaCl corrosion solutions.