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<p>Rh–Ag–Ni-P and Rh–Au–Ni-P multilayer coatings were fabricated on a copper substrate by combining electroless deposition and electroplating methods. Characterization results demonstrated that both the coatings exhibited uniform 33&#xa0;μm-thick layered structures without microcracks, retaining face-centered cubic polycrystalline characteristics. Nanoindentation tests revealed significant mechanical enhancement in the multilayer coatings, with Rh–Ag–Ni-P achieving peak hardness and elastic modulus of 6.156 ± 0.04&#xa0;GPa and 162.85 ± 3.4&#xa0;GPa, respectively, substantially surpassing the performance of single-layer Rh coating. Corrosion evaluations indicated that both Rh–Ag–Ni-P and Rh–Au–Ni-P coatings could withstand acidic salt spray for over 230&#xa0;h without corrosion, demonstrating superior corrosion resistance. This enhanced performance primarily stems from the synergistic coordination between multilayer components and the alternating deposition process, which effectively reduces coating porosity through structural densification. The stability and reliability of the coatings were assessed in the corrosive solution for a long-term immersion time of 168&#xa0;h.</p>

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Microstructure, Mechanical Properties, and Corrosion Resistance of Rh–Ag–Ni-P and Rh–Au–Ni-P Multilayer Coatings Obtained on Copper Substrates

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Zhengjie Xing,
  • Wangping Wu,
  • Qinqin Wang,
  • Zhizhi Wang,
  • Junjun Huang

摘要

Rh–Ag–Ni-P and Rh–Au–Ni-P multilayer coatings were fabricated on a copper substrate by combining electroless deposition and electroplating methods. Characterization results demonstrated that both the coatings exhibited uniform 33 μm-thick layered structures without microcracks, retaining face-centered cubic polycrystalline characteristics. Nanoindentation tests revealed significant mechanical enhancement in the multilayer coatings, with Rh–Ag–Ni-P achieving peak hardness and elastic modulus of 6.156 ± 0.04 GPa and 162.85 ± 3.4 GPa, respectively, substantially surpassing the performance of single-layer Rh coating. Corrosion evaluations indicated that both Rh–Ag–Ni-P and Rh–Au–Ni-P coatings could withstand acidic salt spray for over 230 h without corrosion, demonstrating superior corrosion resistance. This enhanced performance primarily stems from the synergistic coordination between multilayer components and the alternating deposition process, which effectively reduces coating porosity through structural densification. The stability and reliability of the coatings were assessed in the corrosive solution for a long-term immersion time of 168 h.