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Alloys

Enhancing Wear Resistance of Aluminum Alloys through Cr/(Zr,Cr)N/(Zr,Cr,Al)N Multi-Layer Composite Coatings

Strategic Insights

— 1 min read

Investigations into the application of Cr/(Zr,Cr)N/(Zr,Cr,Al)N multi-layer composite coatings on 7050 aluminum alloy have revealed promising results in enhancing wear resistance. Researchers at the Shanghai University of Engineering Science utilized filtered cathodic vacuum arc deposition (FCVAD) technology to deposit coatings under different Cr cathode arc currents (65A, 85A, 105A, 125A). Financial support for this research came from the National Natural Science Foundation of China (NSFC) and the International Cooperation Research Platform Construction Project of Shanghai University of Engineering Science.

Key Takeaways:

  • The application of Cr/(Zr,Cr)N/(Zr,Cr,Al)N multi-layer composite coatings on 7050 aluminum alloy significantly enhanced wear resistance, with the best results observed under a Cr cathode arc current of 85 A.
  • Increasing arc current from 65 A to 125 A led to grain coarsening, reduced Zr content, and increased Cr-rich microdroplets, which negatively impacted coating performance.
  • Nanoindentation tests showed that the coating prepared under a 65 A current exhibited the best hardness (13.03 GPa) and elastic modulus (242.87 GPa), attributed to the formation of fine grains and fewer surface defects.
  • Reciprocating wear tests demonstrated that the wear resistance of all coating samples was superior to that of the uncoated 7050 aluminum alloy substrate, with the best wear resistance observed at an arc current of 85 A.
  • The study revealed a regulatory mechanism of Cr cathode arc current on the microstructure and performance of Cr/(Zr,Cr)N/(Zr,Cr,Al)N multi-layer composite coatings, providing a theoretical basis for optimizing coating process parameters.

Statistics:

  • The best hardness value observed was 13.03 GPa under a 65 A Cr cathode arc current.
  • The highest elastic modulus value observed was 242.87 GPa under a 65 A Cr cathode arc current.
  • The best wear resistance was observed at an arc current of 85 A, with a low wear rate of 5.31 x 10^-5 mm^3 and good mechanical strength.

Sources:

  • Coatings (The Effect of Cr Cathode Arc Current On the Wear Resistance of Cr/(Zr,cr)N/(Zr,cr,al)N Coatings On 7050 Aluminum Alloy). Coatings, 2025;15(9).
  • NewsRx. Findings from Shanghai University of Engineering Science Update Understanding of Nanoindentation [The Effect of Cr Cathode Arc Current On the Wear Resistance of Cr/(Zr,cr)N/(Zr,cr,al)N Coatings On 7050 Aluminum Alloy]. Nanotechnology Weekly. October 20, 2025; p 850.

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