Journal
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
Volume 50, Issue -, Pages 23-32Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmbbm.2015.06.004
Keywords
Magnetron sputtering; Corrosion; Tribological property; Antibacterial; Ti-Cu coated layer; Stainless steel
Funding
- National Natural Science Foundation of China [51171125, 11172195]
- National Science Foundation for Distinguished Young Scholars of China [E010101]
- Shanxi Province Programs for Science and Technology Innovation [2014jyt03]
- Post-doctoral Science Fund of China [2013M541209]
- Youth Foundation of Taiyuan University of Technology [2012L073]
- Program for the Young Teams of Taiyuan University of Technology [2013T065]
- Natural Science Foundation for Young Scientists of Shanxi Province [2013021013-5]
- Shanxi province Nature Science Fund [2012011021-3]
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A Ti-Cu coated layer on 316L stainless steel (SS) was obtained by using the Closed Field Unbalanced Magnetron Sputtering (CFUBMS) system to improve antibacterial activity, corrosion and tribological properties. The microstructure and phase constituents of Ti-Cu coated layer were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and glow discharge optical emission spectrometry (GDOES). The corrosion and tribological properties of a stainless steel substrate, SS316L, when coated with Ti-Cu were investigated in a simulated body fluid (SBF) environment. The viability of bacteria attached to the antibacterial surface was tested using the spread plate method. The results indicate that the Ti-Cu coated SS316L could achieve a higher corrosion polarization resistance and a more stable corrosion potential in an SBF environment than the uncoated SS316L substrate. The desirable corrosion protection performance of Ti-Cu may be attributable to the formation of a Ti-O passive layer on the coating surface, protecting the coating from further corrosion. The Ti-Cu coated SS316L also exhibited excellent wear resistance and chemical stability during the sliding tests against Si3N4 balls in SBF environment. Moreover, the Ti-Cu coatings exhibited excellent antibacterial abilities, where an effective reduction of 99.9% of Escherichia coli (E.coli) within 12 h was achieved by contact with the modified surface, which was attributed to the release of copper ions when the Ti-Cu coatings are in contact with bacterial solution. (C) 2015 Elsevier Ltd. All rights reserved.
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