Received: 17 July 2018 | Accepted: 15 August 2018 DOI: 10.1002/maco.201810423 ARTICLE Corrosion of porous Ti35Zr28Nb in Hanks’ solution and 3.5 wt% NaCl Matthew Heywood 1 | Zhiming Shi 1 | Yuncang Li 2 | Cuie Wen 2 | Jagat Kanwar 3 | Yin Xiao 4 | Andrej Atrens 1 1 School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia 2 School of Engineering, RMIT University, Bundoora, Victoria 3083, Australia 3 Faculty of Health, School of Medicine, Deakin University, Waurn Ponds, Geelong, Victoria 3216, Australia 4 Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland 4059, Australia Correspondence Andrej Atrens, School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, Queensland 4072, Australia. Email: andrejs.atrens@uq.edu.au Funding information National Health and Medical Research Council, Grant number: GNT1087290 The present research examined the corrosion and crevice corrosion behavior of porous specimens of Ti35Zr28Nb and CP Ti in Hanks’ solution at 37 °C and in 3.5 wt% NaCl at 95 °C. The following conclusions can be drawn. There was no crevice corrosion for porous specimens of Ti35Zr28Nb and CP Ti in Hanks’ solution at 37 °C and in 3.5 wt % NaCl at 95 °C. Both alloys had low corrosion rates in both solutions, and both alloys were passive in both solutions. KEYWORDS crevice corrosion, EIS, polarisation, SEM, titanium, weight loss 1 | INTRODUCTION Many studies have demonstrated that titanium (Ti) alloys are appropriate for such biomedical applications [1–4] as stents, dental implants, orthopaedics, total joint replacements, fasteners, and regenerative bone replacements. There con- tinues to be significant research in this area. [5–15] Additive manufacturing is convenient for biomedical components due to design flexibility, low manufacturing cost for one-off, complicated-shaped components, and the ability for part production without the use of a specific die. [11,16] The use of Ti alloys is largely based on their good corrosion resistance because they spontaneously form a passive film in biological solutions [17–29] . However, crevice corrosion can be an issue. [30–36] Ti35Zr28Nb is a relatively newly developed Ti alloy processing a good combination of properties [37,38] and is well suited for medical implant applications, based on extensive research on beta-Ti alloys. [39,40] Prior work [41] found that Ti35Cr28Nb had high corrosion resistance, and was highly resistant to crevice corrosion. This paper follows on from the prior study, [41] and aims to assess the corrosion behavior of porous Ti35Zr28Nb compared with porous commercial-purity CP Ti Grade 2, under crevice corrosion conditions, in Hanks’ solution at 37 °C and 3.5 wt% NaCl solution at 95 °C. Hanks’ solution simulates medical implant conditions, while the 3.5 wt% NaCl solution provides much more aggressive conditions. 2 | EXPERIMENTAL METHODS 2.1 | Crevice corrosion Figure 1a provides a schematic of the crevice-corrosion assembly. [41] Figure 1b provides a photo of an actual crevice corrosion assembly, in this case containing three specimens each of the porous CP–Ti samples, and the porous Ti35Zr28Nb samples. The specimens were produced by selective laser melting (SLM) based on the computer aided design (CAD) drawings such as the typical one in Figure 2a in high-porosity (85%) (Hp) and low-porosity (50%) (Lp) versions as shown in Materials and Corrosion. 2018;1–8. www.matcorr.com © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim | 1