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<p>Cr-doped a-C:H:SiO<sub>x</sub> coatings were deposited on Ti-6Al-4V substrates via hybrid plasma-assisted CVD and magnetron sputtering, with chromium content (0–27.8 at.%) controlled by magnetron power (0–300 W). Comprehensive characterization, including SEM, EDS, and XPS, confirmed the presence of chromium in both metallic and oxidized forms, without any evidence of carbide formation. The coatings’ microstructure, composition, corrosion resistance, tribological properties, and electrical resistivity were systematically investigated. Potentiodynamic polarization tests in 0.5&#xa0;M NaCl revealed that all a-C:H:SiO<sub>x</sub> coatings, regardless of Cr content, significantly enhanced the corrosion resistance of Ti-6Al-4V compared to the bare alloy. However, increasing chromium concentration led to a moderate decrease in corrosion resistance, attributed to the formation of Cr oxides and changes in the coating’s microstructure. In contrast, electrical resistivity decreased by several orders of magnitude with Cr doping, reaching 6.9 × 10<sup>‒4</sup> Ω·cm at 27.8 at. % Cr, indicating a transition from dielectric to conductive behavior. Tribological tests in phosphate-buffered saline demonstrated that moderate Cr additions preserved the wear resistance and integrity of the coatings. However, excessive Cr content reduces wear resistance. These results highlight the potential of Cr-doped a-C:H:SiO<sub>x</sub> coatings as multifunctional protective layers for biomedical implants and electrical contacts operating in corrosive environments.</p>

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Tribological and Corrosion Behavior of Cr-Doped a-C:H:SiOx Coatings

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • A. S. Grenadyorov,
  • K. V. Oskomov,
  • N. Madzhara,
  • A. A. Solovyev

摘要

Cr-doped a-C:H:SiOx coatings were deposited on Ti-6Al-4V substrates via hybrid plasma-assisted CVD and magnetron sputtering, with chromium content (0–27.8 at.%) controlled by magnetron power (0–300 W). Comprehensive characterization, including SEM, EDS, and XPS, confirmed the presence of chromium in both metallic and oxidized forms, without any evidence of carbide formation. The coatings’ microstructure, composition, corrosion resistance, tribological properties, and electrical resistivity were systematically investigated. Potentiodynamic polarization tests in 0.5 M NaCl revealed that all a-C:H:SiOx coatings, regardless of Cr content, significantly enhanced the corrosion resistance of Ti-6Al-4V compared to the bare alloy. However, increasing chromium concentration led to a moderate decrease in corrosion resistance, attributed to the formation of Cr oxides and changes in the coating’s microstructure. In contrast, electrical resistivity decreased by several orders of magnitude with Cr doping, reaching 6.9 × 10‒4 Ω·cm at 27.8 at. % Cr, indicating a transition from dielectric to conductive behavior. Tribological tests in phosphate-buffered saline demonstrated that moderate Cr additions preserved the wear resistance and integrity of the coatings. However, excessive Cr content reduces wear resistance. These results highlight the potential of Cr-doped a-C:H:SiOx coatings as multifunctional protective layers for biomedical implants and electrical contacts operating in corrosive environments.