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Surface Modification and Degradation Performance of Ag-Immobilized Polydopamine-Coated Zinc Wires
Md Tanvir Hossain1, H R Bakhsheshi-Rad1,2, Bashir Ahamed1
1Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, 49931, USA.
Materials Letters
|July 28, 2026
Summary
This study developed silver-polydopamine coatings on zinc wires for enhanced corrosion resistance. Optimal silver content improved coating uniformity and protection, crucial for biodegradable zinc applications.
Area of Science:
- Materials Science
- Corrosion Science
- Surface Engineering
Background:
- Biodegradable zinc (Zn) wires are promising for medical implants but susceptible to corrosion.
- Developing protective coatings is essential to control Zn degradation and improve performance.
- Polydopamine (PDA) coatings offer a versatile platform for incorporating functional nanoparticles.
Purpose of the Study:
- To create silver-containing polydopamine (PDA-Ag) coatings on Zn wires.
- To investigate the effect of silver content on coating properties and corrosion resistance.
- To optimize PDA-Ag coatings for enhanced protection of biodegradable Zn.
Main Methods:
- Mussel-inspired, immersion-assisted polymerization to deposit PDA-Ag coatings (~1-5 wt% Ag) on Zn wires.
- Surface characterization using techniques like XPS and EDS to analyze coating thickness, uniformity, and composition.
- Electrochemical testing (e.g., measuring corrosion current density and charge-transfer resistance) to evaluate corrosion performance.
Main Results:
- Continuous, homogeneous, and well-adhered PDA-Ag coatings (~720 nm thick) were successfully formed.
- Uniform distribution of silver nanoparticles within the PDA matrix was confirmed.
- PDA-Ag5 coating (5 wt% Ag) showed the highest corrosion resistance, with reduced corrosion current density and increased charge-transfer resistance.
- Excessive silver content negatively impacted the coating's protective capabilities.
Conclusions:
- Controlling silver content is critical for achieving uniform PDA-Ag coatings.
- Optimized PDA-Ag coatings significantly enhance the corrosion protection of biodegradable Zn wires.
- This mussel-inspired approach provides a viable method for developing advanced protective coatings for Zn implants.
