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Related Concept Videos

Electrodeposition01:08

Electrodeposition

648
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
648

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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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A Nickel Dissolution Process for Multilayer Electroforming to Achieve Ultrahigh Adhesion Strength.

Zhuangzhuang Wang1, Chunjian Shen1, Zhou Ma1

  • 1College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, China.

Materials (Basel, Switzerland)
|October 14, 2023
PubMed
Summary

This study introduces an in situ treatment to enhance nickel (Ni) layer adhesion during multilayer electroforming. The novel method significantly boosts normal and shear adhesion strengths between Ni layers, overcoming oxidation issues.

Keywords:
adhesion performancedissolution efficiencymultilayer electroformingnickel

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Engineering

Background:

  • Multilayer electroforming offers potential for producing high-quality Ni/Ni structured metal walls.
  • Nickel's susceptibility to oxidation in air leads to poor adhesion between layers, limiting applications.

Purpose of the Study:

  • To develop and evaluate a novel in situ treatment for improving adhesion between electroformed Ni layers.
  • To address the challenge of low interlayer adhesion caused by nickel oxidation.

Main Methods:

  • A three-step in situ treatment involving electrochemical dissolution, surface protection, and electroforming was employed.
  • Polarization behavior studies determined optimal conditions for oxide removal and surface activation in NH2SO3H solution.
  • Characterization of adhesion strength using normal and shear tests.

Main Results:

  • Electrochemical dissolution effectively removed the oxide film from the Ni layer at a current density of 5 A·cm⁻².
  • Surface activation and protection were achieved at 8 A·cm⁻², resulting in a smooth, hydrophilic substrate.
  • Ultrahigh normal and shear adhesion strengths exceeding 400 MPa between Ni layers were successfully obtained.

Conclusions:

  • The proposed in situ treatment significantly enhances interlayer adhesion in multilayer Ni electroforming.
  • This method overcomes the limitations of Ni oxidation, enabling the production of robust Ni/Ni layered structures.
  • The achieved adhesion strengths pave the way for advanced applications requiring high-performance metal walls.