Study on Corrosion Resistance and Bio-Tribological Behavior of Porous Structure Based on the SLM Manufactured Medical Ti6Al4V

• Published in: Metals and materials international 2020, 26(8), , pp.1182-1191
• Main Authors: Lu, Peipei, Wu, Meiping, Liu, Xin, Duan, Weipeng, Han, Jitai
• Format: Article
• Language: English
• Subjects: Atomic states; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion mechanisms; Corrosion resistance; Corrosion tests; Corrosive wear; Crystal lattices; Engineering Thermodynamics; Equivalent circuits; Heat and Mass Transfer; Laser beam melting; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metal surfaces; Metallic Materials; Oxidation resistance; Oxide coatings; Porosity; Processes; Solid Mechanics; Substrates; Surgical implants; Titanium base alloys; Titanium dioxide; Tribology; Wear mechanisms; Wear resistance; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-019-00506-w

Titanium and its alloy, especially Ti6Al4V is one of the most widely used metal due to its excellent properties. Selective laser melting, which is known as additive manufacturing is considered as a suitable method to manufacture Ti6Al4V parts. To print a more analogous Ti6Al4V artificial bone, laser power was changed by taking volume porosity, corrosion resistance and wear resistance into consideration. The testing results showed that sample printed using 200 W showed a relative optimal corrosion resistance and volume porosity in all these five samples (the value of corrosion voltage is − 0.352 V), while it showed the best bio-tribological behavior, and its wear volume is as low as 5.90 μm 3 . Summarize the 5 sets of experimental samples, the Ti6Al4V part printed using 180–200 W were the most prominent in the test, its overall performance was, indeed, best fit to print artificial Ti6Al4V bone, because it is similar to bone, there are a large number of microporous structures. Graphic Abstract Corrosion mechanism At the oxide film/metal interface, the metal undergoes an ionization reaction to form M 2+ , the O 2 molecule forms an atomic state of oxygen by physical adsorption on the metal surface, and then chemically adsorbs to form O − , and is bonded to the oxide crystal lattice in an O 2− state to form a new oxide which hinders further oxidation. The presence of voids also reduces the corrosion resistance of the substrate material due to the increased corrosion area, and corrosive ions are more likely to penetrate into corrosive materials. Wear mechanism Ploughing wear and oxidation erode can be seen on the surface while ploughing wear was the most significant mechanism. From the EDS results, it can be found that the abrasive dust was mainly composed of TiO 2 . This phenomenon was due to the fact that Ti is a kind of active metal and it is easily oxidized. That is the reason why oxidation erode can also be found on the surface and it further explained the equivalent circuit given in corrosion behavior section.