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Mater Sci Eng C Mater Biol Appl. 2017 Jan 1;70(Pt 1):832-841. doi: 10.1016/j.msec.2016.07.045. Epub 2016 Jul 28.

Corrosion resistance characteristics of a Ti-6Al-4V alloy scaffold that is fabricated by electron beam melting and selective laser melting for implantation in vivo.

Author information

1
Department of Stomatology, General Hospital of the PLA, Beijing, China; Department of Stomatology, The Second Affiliated Stomatological Hospital of Liaoning Medical University, China.
2
College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China.
3
School of Medicine, Nankai University, Tianjin 300071, China.
4
Department of Stomatology, General Hospital of the PLA, Beijing, China. Electronic address: humin48@vip.163.com.

Abstract

The purpose of this study is to determine the corrosion resistance of Ti-6Al-4V alloy fabricated with electron beam melting and selective laser melting for implantation in vivo. Ti-6Al-4V alloy specimens were fabricated with electron beam melting (EBM) and selective laser melting (SLM). A wrought form of Ti-6Al-4V alloy was used as a control. Surface morphology observation, component analysis, corrosion resistance experimental results, electrochemical impedance spectroscopy, crevice corrosion resistance experimental results, immersion test and metal ions precipitation analysis were processed, respectively. The thermal stability of EBM specimen was the worst, based on the result of open circuit potential (OCP) result. The result of electrochemical impedance spectroscopy indicated that the corrosion resistance of the SLM specimen was the best under the low electric potential. The result of potentiodynamic polarization suggested that the corrosion resistance of the SLM specimen was the best under the low electric potential (<1.5V) and EBM specimen was the best under the high electric potential (>1.5V).The crevice corrosion resistance of the EBM specimen was the best. The corrosion resistance of SLM specimen was the best, based on the result of immersion test. The content of Ti, Al and V ions of EBM, SLM and wrought specimens was very low. In general, the scaffolds that were fabricated with EBM and SLM had good corrosion resistance, and were suitable for implantation in vivo.

KEYWORDS:

Corrosion resistance; Electron beam melting (EBM); Implants; Selective laser melting (SLM); Ti-6Al-4V

PMID:
27770961
DOI:
10.1016/j.msec.2016.07.045
[Indexed for MEDLINE]

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