Journal
MATERIALS & DESIGN
Volume 208, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2021.109907
Keywords
Additive manufacturing; Selective laser melting; Titanium alloys; Corrosion behavior; Passive film
Categories
Funding
- Jiangsu Province six talent peaks project [XCL-117]
- Natural Science Foundation of Jiangsu [BK20201456]
- Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University [2020GXYSOF01, 2021GXYSOF03]
- Key Research and Development Program of Shaanxi [2020GY-251]
- ECU Postgraduate Research Scholarship
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The corrosion behavior of L-PBF-produced titanium alloys in body fluid is investigated in this study. Compared to static Hank's solution, dynamic Hank's solution leads to lower charge transfer resistance and higher passivation current density for Ti-6Al-4V. Additionally, more deposition of apatite and hydroxyapatite is observed in dynamic Hank's solution.
The corrosion behavior of laser powder bed fusion produced (L-PBF-produced) titanium alloys involving flowing body fluid is still unclear. Therefore, this work investigates in vitro corrosion behavior and the characteristics of passive films formed on L-PBF-produced Ti-6Al-4V in both static and dynamic Hank's solutions. Electrochemical measurements, immersion tests, X-ray photoelectron spectroscopy and scanning electron microscopy were conducted. In comparison to the L-PBF-produced Ti-6Al-4V in static Hank's solution, the samples showed lower charge transfer resistance and higher passivation current density (anodic current density as well) in dynamic Hank's solution. Meanwhile, a more apparent deposition of apatite and hydroxyapatite is found on the L-PBF-produced Ti-6Al-4V in dynamic Hank's solution. Such outcomes mainly result from the enhancement of film/solution interfacial transportation in dynamic Hank's solution. The dynamic Hank's solution provides more calcium and phosphate ions to the surface of the passive film and also takes away the dissolved metal ions. Therefore, more salt deposition and a lower-quality passive film are found. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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