Ni²⁺‐Assisted Dealloying Strategy to Prepare Nanoporous Cu–Ni Alloys with Enhanced Corrosion Resistance

Abstract

To address the challenges associated with preparation of nanoporous Cu–Ni (NP‐CuNi) alloys containing high Ni concentrations, we propose a Ni2+‐assisted dealloying strategy. The proposed strategy involves a three‐stage dealloying process primarily driven by dynamic Ni deposition/dissolution. The Ni concentration in NP‐CuNi was tuned by altering the Ni content of the Cu–Mn precursor alloy and Ni2+ in a H2SO4 solution. The Ni concentration of the nanoporous Cu66.5Ni28.5Mn5 alloy prepared in a H2SO4+NiSO4 solution was increased by 5.2 times compared to that of the alloy prepared in the H2SO4 solution alone. Moreover, the corrosion resistance test demonstrated a reduction in corrosion current density by 58.3% compared to NP‐Cu.This article is protected by copyright. All rights reserved.