Unusual anti-bacterial behavior and corrosion resistance of magnesium alloy coated with diamond-like carbon

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

7 Scopus Citations
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Author(s)

  • Hongqing Feng
  • Xiaolin Zhang
  • Guosong Wu
  • Weihong Jin
  • Qi Hao
  • Yifan Huang

Detail(s)

Original languageEnglish
Pages (from-to)14756-14762
Journal / PublicationRSC Advances
Volume6
Issue number18
Online published29 Jan 2016
Publication statusPublished - 2016

Abstract

Magnesium and magneisum alloys are promising materials in degradable biomedical implants and also have inherent anti-bacterial ability. A surface coating can reduce the surface corrosion rate of magnesium-based materials without compromising the anti-bacterial properties. In this work, diamond-like carbon (DLC) coatings are deposited on the AZ31 Mg alloy by one-step plasma immersion ion implantation and deposition (PIII&D). After PIII&D, the corrosion current density diminishes largely from 3.17 × 10-4 A cm-2 to 6.53 × 10-5 A cm-2. The pH and amounts of leached magnesium ions are also significantly reduced. Meanwhile, 3 × 104 bacteria seeded on the AZ31-DLC are completely annihilated within 6 hours in contrast to 5 × 103 live ones left on the untreated AZ31 and more than 6 × 108 on Si-DLC (DLC deposited on Si). The favorable anti-bacterial behavior of AZ31-DLC is attributed to the combined effects of favorable bacteria adhesion on the DLC surface and local release of hydroxyl and magnesium ions from the magnesium substrate via defects in the DLC films.

Citation Format(s)

Unusual anti-bacterial behavior and corrosion resistance of magnesium alloy coated with diamond-like carbon. / Feng, Hongqing; Zhang, Xiaolin; Wu, Guosong; Jin, Weihong; Hao, Qi; Wang, Guomin; Huang, Yifan; Chu, Paul K.

In: RSC Advances, Vol. 6, No. 18, 2016, p. 14756-14762.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review