Investigation of electrochemical corrosion behavior of additive manufactured Ti–6Al–4V alloy for medical implants in different electrolytes

There is increasing concern about the surface degradation of bioimplants in various corrosive environments. The dissolution of implant materials may cause an inflammatory reaction with internal organs and can be fatal. Here, the corrosion properties of selective laser melted Ti–6Al–4V (SLM Ti–6Al–4V...

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Veröffentlicht in:Journal of alloys and compounds 2020-07, Vol.830, p.154620, Article 154620
Hauptverfasser: Sharma, Ashutosh, Oh, Min Chul, Kim, Jung-Taek, Srivastava, Ashok K., Ahn, Byungmin
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Sprache:eng
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Zusammenfassung:There is increasing concern about the surface degradation of bioimplants in various corrosive environments. The dissolution of implant materials may cause an inflammatory reaction with internal organs and can be fatal. Here, the corrosion properties of selective laser melted Ti–6Al–4V (SLM Ti–6Al–4V) were investigated in different corrosive media (NaOH, NaCl, H2SO4 and simulated body fluid (SBF)). The corrosion tests were conducted by potentiodynamic polarization and electrochemical impedance spectroscopy coupled with optical and scanning electron microscopy. A commercial cast Ti–6Al–4V alloy sample was used as a reference for comparison. The results show that the polarization and charge transfer resistance of SLM and cast Ti–6Al–4V are considerably high in NaOH, SBF and NaCl, whereas extremely poor corrosion resistance occurs in a more aggressive solution (H2SO4). These results can be correlated to the abundant metastable αʹ-martensite phase and the higher surface porosity of the SLM Ti–6Al–4V alloy in comparision to the cast Ti–6Al–4V, which degrades the passivity. The corrosion resistance of all samples in the various media followed the order of (NaOH)cast Ti–6Al–4V > (NaOH)SLM Ti–6Al–4V > (SBF)cast Ti–6Al–4V > (SBF)SLM Ti–6Al–4V > (NaCl)cast Ti–6Al–4V > (NaCl)SLM Ti–6Al–4V > (H2SO4)cast Ti–6Al–4V > (H2SO4)SLM Ti–6Al–4V. [Display omitted] •Corrosion of additive manufactured Ti–6Al–4V in acidic, neutral & alkaline media.•Mild to moderate corrosion in NaOH, SBF & NaCl but a severe damage in H2SO4 medium.•The undesirable corrosion in additive manufactured alloy is related to dominant α’ & least β-Ti.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2020.154620