Antibacterial Properties of Stainless Steel Coated on Ti6Al4V Alloy (original) (raw)
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Antibacterial Properties of Stainless Steel Coated on Ti6Al4V Alloy 1
Titanium alloys and stainless steel type 316L are used in biomedical applications due to their high corrosion resistance and good biocompatibility properties. In this study, a functionally graded material composed of titanium and stainless steel was fabricated using a powder metallurgical technique. Ti6Al4V alloy powder was placed as a substrate into a graphite crucible and stainless steel powder was added as a thin layer on the Ti6Al4V powder. The two layers were consolidated in-situ using a uniaxial hot press. The sintering process was carried out at 1050 o C for 30 minutes under 50 MPa. The pressure was maintained during the whole sintering process. A disc shape compact of 20 mm diameter and 5 mm thickness was obtained after sintering. The samples were metallographically prepared and their antibacterial properties were evaluated. A strong bonding was observed between the Ti6Al4V substrate and the 316L stainless steel layer, and no bacteria were observed on the stainless steel surface.
COMPARATIVE STUDY ON BIOACTIVE COATING OF Ti-6Al-4V ALLOY AND 316 L STAINLESS STEEL
metalurgija.org.rs
In the present investigation, hydroxyapatite (HA) bioactive coating is deposited with sol-gel method on the surface of 316 L stainless steel and Ti-6Al-4V alloy as the most important biomaterials. Biocompatible additives such as P2O5, Na2CO3, KH2PO4 and HA commercial powder have been used for preparation of HA sol-gel. Characterization of the coated specimens was performed using SEM, XRD, EDS, AFM and optical microscopy. Substrates mechanical properties, e.g. micro hardness and bonding strength, were evaluated in respect to the substrates sintering temperature after completion of the coating process. The results show that denser structure of HA can be obtained by increasing the sintering temperature. In addition, pores volume fraction and size decreased by increasing the sintering temperature. It is shown that surface roughness of the HA decreased when the sintering temperature was incresed to 800 °C. However, growth of the HA grains for the coated alloys sintered at 800 ºC is attributed to the slight increase in roughness. Hardness and bonding strength of the biomaterials increased for the metals sintered at the higher temperatures. Different responses to the mechanical tests have been seen for in the titanium alloy sintered at 800 °C.
Inorganic antimicrobial coating for titanium alloy and its effect on bacteria
Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association, 2009
For orthopedic implants, infection is a serious problem. Therefore, we considered an implant with antimicrobial ability can prevent infection. We tried to coat a titanium alloy surface with Novaron, a commercially available inorganic antimicrobial. The purpose of this study was to analyze the differences among the surfaces of materials coated using different processing pressures of the working gas and analysis of the antimicrobial activity. One of the inorganic antimicrobials Novaron (grade VZ 600) was applied to titanium alloy (Ti6Al4V) plates. This antimicrobial has limited heat resistance, so we used cold spray technology to coat the titanium alloy with it. The principle of cold spray technology is spraying a powder in a high-velocity gas jet, accelerated by adiabatic expansion, against a substrate. Scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS) were used to analyze the differences among the surfaces of materials coated using different processin...
Advances in Materials Science
This study aims to investigate the influence of adding a coating layer of austenitic stainless steel type 316L on Ti6Al4V alloy on corrosion behaviour. Samples of 316L, Ti6Al4V, and 316L on Ti6Al4V were prepared by hot-press sintering of their powders. The potentiodynamic polarization technique was used to characterize the corrosion behaviour of the samples in 0.9 and 3.5 wt. % NaCl concentrations. The corrosion potential (Ecorr.), current density (icorr) and corrosion rate (CR) of the sintered samples were compared in this study. The results showed that 316L samples had the best corrosion resistance, although micropits were observed on the surface, while Ti6Al4V samples had the lowest. This corrosion behaviour of sintered 316L samples can be interrelated to the existence of a passive layer on stainless steel alloys that can be attacked by chloride ions and causing localized corrosion. In general, the CR values of Ti6Al4V samples coated by 316L were between the 316L and Ti6Al4V samp...
Coatings, 2020
Ti-6Al-4V, although widely used in dental materials, causes peri-implant inflammation due to the long-term accumulation of bacteria around the implant, resulting in bone loss and eventual failure of the implant. This study aims to overcome the problem of dental implant infection by analyzing the influence of Ti-6Al-4V surface characteristics on the quantity of accumulated bacteria. Ti-6Al-4V specimens, each with different surface roughness are produced by mechanical, chemical, and electrolytic polishing. The surface roughness, surface contact angle, surface oxygen content, and surface structure were measured via atomic force microscopy (AFM), laser scanning confocal microscopy (LSCM), drop shape analysis (using sessile drop), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The micro and macro surface roughness are 10.33–120.05 nm and 0.68–2.34 μm, respectively. The surface X direction and Y direction contact angle are 21.38°–96.44° and 18.37°–92.72°, respectivel...
Materials Science Forum, 2012
In this work, the effect of sintering atmosphere on the corrosion resistance of sintered titanium has been evaluated in 0.9 % aqueous NaCl solution to simulate physiological environment. Corrosion tests were performed on titanium porous sintered under vacuum and vacuum plus dynamic argon. The results showed better passive properties associated to the titanium sintered under argon plus vacuum atmosphere than to the vacuum sintered titanium. The better corrosion resistance of the argon plus vacuum sintered titanium was attributed to the formation of a thin passive film on the titanium surface during sintering due the low oxygen content present in this atmosphere.
Corrosion Resistance of Additively Manufactured Ti-6al-4v for Biomedical Applications
Social Science Research Network, 2022
In this paper, synergistic effects of chloride (Cl-) and thiosulfate (S 2 O 3 2-) on corrosion resistance of additively manufactured (AM) and wrought 316L stainless steel (SS) were investigated in ammonium chloride (NH 4 Cl) solution in the absence and presence of different concentrations of sodium thiosulfate (Na 2 S 2 O 3). General corrosion induced by Claccelerated with the increase of S 2 O 3 2concentration for both of the samples. However, pitting resistance of AM 316L SS was found to be at least 4-to 6-fold higher than that of the wrought sample depending on S 2 O 3 2concentration. The AM sample demonstrated significantly improved metastable pitting resistance in the presence of S 2 O 3 2into Clsolution. In addition, the passive film of AM 316L SS offered higher charge transfer resistance and film resistance confirming its better stability and barrier characteristics in Cl-S 2 O 3 2environment. The superior corrosion resistance of AM 316 L SS compared to wrought sample was attributed to refined microstructure, absence of MnS micro-inclusions, and lack of Cr depleted regions.
Nanomaterials, 2022
Inspired by observations that the natural topography observed on cicada and dragonfly wings may be lethal to bacteria, researchers have sought to reproduce these nanostructures on biomaterials with the goal of reducing implant-associated infections. Titanium and its alloys are widely employed biomaterials with excellent properties but are susceptible to bacterial colonisation. Hydrothermal etching is a simple, cost-effective procedure which fabricates nanoscale protrusions of various dimensions upon titanium, depending on the etching parameters used. We investigated the role of etching time and the choice of cation (sodium and potassium) in the alkaline heat treatment on the topographical, physical, and bactericidal properties of the resulting modified titanium surfaces. Optimal etching times were 4 h for sodium hydroxide (NaOH) and 5 h for potassium hydroxide (KOH). NaOH etching for 4 h produced dense, but somewhat ordered, surface nanofeatures with 75 nanospikes per µm2. In compar...
Biomimetic Coatings on Ti-Based Alloys Obtained by Powder Metallurgy for Biomedical Applications
Materials Science Forum, 2006
Comparing to hydroxyapatite (HA), which forms a strong chemical bond with the bony tissues, metallic materials are not able to bond with bone. For this reason, a great variety of complex coating methods, such as pulse-laser deposition, ion-beam assisted deposition and plasma-spray has been used to form a HA layer onto metallic surfaces. This study evaluated the performance of the biomimetic technique on apatite-based coating formation on two Ti-alloys. Ti-13Nb-13Zr and Ti-35Nb-7Zr-5Ta were obtained via powder metallurgy. The Ti-based alloys were biomimetically coated using a technique which was modified from the conventional ones using a sodium silicate solution as the nucleant agent. Both alloys presented similar behavior in the evaluated conditions which means the formation of a homogeneous and well defined HA coating. These results show that these new non-toxic Ti-alloys seem to be very promising for biomedical applications.
Characterisation of bioactive films on Ti–6Al–4V alloy
Electrochimica Acta, 2013
In an attempt to increase the bioactivity and corrosion resistance of a Ti-6Al-4V alloy, the plasma electrolytic oxidation (PEO) process for surface modification was utilised. Selected samples were subjected to further treatment, either thermal or alkali. The morphology, chemical composition and phase composition of the ground and treated Ti-6Al-4V alloy substrates were investigated using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). It was observed that during the anodic process under sparking discharge conditions, the simultaneous incorporation of calcium and phosphorus in the forming oxide layer occurs. The resulting layers were porous and exhibited the typical morphology for layers formed during the PEO process. After the alkali treatment of samples oxidised at 140 V, a gel-like titanate layer was formed. The bioactivity investigations in simulated body fluid (SBF) solution and with human bone marrow stromal cells (MSCs) indicated that after anodising at 140 V and following alkali treatment the Ti-6Al-4V alloy exhibits osteoinductive properties. The electrochemical investigations showed that application of the anodising process of the Ti-6Al-4V alloy significantly improved its corrosion resistance in Ringer solution. The samples anodised at 80 V presented the highest corrosion resistance because of the formation of the thin, compact oxide layer on the alloy surface.