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titanium corrosion

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https://www.readbyqxmd.com/read/28315814/a-closer-look-at-the-in-vitro-electrochemical-characterisation-of-titanium-alloys-for-biomedical-applications-using-in-situ-methods
#1
J-L Wang, R L Liu, T Majumdar, S A Mantri, V A Ravi, R Banerjee, N Birbilis
Titanium (Ti) and its alloys are widely used in several biomedical applications, particularly as permanent orthopaedic implants. Electrochemical testing provides a means to perform accelerated corrosion testing, however whilst results from polarisation testing for Ti and its alloys to date have been generally useful, they are also rather limited on the basis of several reasons. One reason is that the polarisation curves for Ti and its alloys in simulated body fluids all appear rather similar, and they do not present a classical 'breakdown' or pitting potential, making discrimination between alloys difficult...
March 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28297095/adverse-reactions-to-orthodontic-materials
#2
I Sifakakis, T Eliades
Adverse effects can arise from the clinical use of orthodontic materials, due to the release of constituent substances (ions from alloys and monomers, degradation by-products, and additives from polymers). Moreover, intraoral aging affects the biologic properties of materials. The aim of this review is to present the currently identified major adverse effects of the metallic and polymeric components found in orthodontic appliances and materials. Corrosion in metallic orthodontic attachments releases metal ions, mainly iron, chromium, and nickel...
March 2017: Australian Dental Journal
https://www.readbyqxmd.com/read/28294119/low-cost-and-durable-bipolar-plates-for-proton-exchange-membrane-electrolyzers
#3
P Lettenmeier, R Wang, R Abouatallah, B Saruhan, O Freitag, P Gazdzicki, T Morawietz, R Hiesgen, A S Gago, K A Friedrich
Cost reduction and high efficiency are the mayor challenges for sustainable H2 production via proton exchange membrane (PEM) electrolysis. Titanium-based components such as bipolar plates (BPP) have the largest contribution to the capital cost. This work proposes the use of stainless steel BPPs coated with Nb and Ti by magnetron sputtering physical vapor deposition (PVD) and vacuum plasma spraying (VPS), respectively. The physical properties of the coatings are thoroughly characterized by scanning electron, atomic force microscopies (SEM, AFM); and X-ray diffraction, photoelectron spectroscopies (XRD, XPS)...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28282634/in-situ-preparation-of-scholzite-conversion-coatings-on-titanium-and-ti-6al-4v-for-biomedical-applications
#4
Bing Liu, Xiao-Ming Shi, Gui-Yong Xiao, Yu-Peng Lu
A scholzite (CaZn2(PO4)2·2H2O) coating was prepared in situ on commercially pure titanium (cpTi) and Ti-6Al-4V (Ti64) substrates using the chemical conversion technology, and its phase composition and microstructure, as well as mechanical, chemical and biological properties were investigated to explore potential applications as a bioactive coating on bone implants. It is indicated that the coating consists mainly of monoclinic scholzite crystals with nano-thick laminar morphology. The crystals on cpTi aggregate to flower-like particles with the diameter of 5-10μm, while form a network structure homogeneously on Ti64...
March 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28276196/preparation-and-characterization-of-alloys-of-the-ti-15mo-nb-system-for-biomedical-applications
#5
J R S Martins Júnior, A A Matos, R C Oliveira, M A R Buzalaf, I Costa, L A Rocha, C R Grandini
In the development of new metallic biomaterials, the Ti-15Mo alloy has great prominence because of its excellent corrosion resistance and good combination of mechanical properties. In this study, the element niobium was added to the Ti-15Mo alloy, forming the Ti-15Mo-Nb system for the purpose of improving their properties and promoting its application as a biomaterial. These alloys are very promising to use as biomedical implants, because they integrate a new class of titanium alloys without the presence of aluminum and vanadium, which may cause cytotoxic effects...
March 9, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28276193/assessment-of-corrosion-in-retrieved-spine-implants
#6
V C Panagiotopoulou, H S Hothi, H A Anwar, S Molloy, H Noordeen, K Rezajooi, J Sutcliffe, J A Skinner, A J Hart
Recently the use of dissimilar metals in spine instrumentation has increased, especially in the case of adult deformities, where rods made from Cobalt Chrome alloys (CoCr) are used with Titanium (Ti) screws. The use of dissimilar metals increases the risk of galvanic corrosion and patients have required revision spine surgery due to severe metallosis that may have been caused by corrosion. We aimed to assess the presence of corrosion in spine implant retrievals from constructs with two types of material combinations: similar (Ti/Ti) and dissimilar (CoCr/Ti)...
March 9, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28274193/a-peptide-based-biological-coating-for-enhanced-corrosion-resistance-of-titanium-alloy-biomaterials-in-chloride-containing-fluids
#7
Noah Muruve, Yuanchao Feng, Jaye Platnich, Daniel Hassett, Randall Irvin, Daniel Muruve, Frank Cheng
Titanium alloys are common materials in the manufacturing of dental and orthopedic implants. Although these materials exhibit excellent biocompatibility, corrosion in response to biological fluids can impact prosthesis performance and longevity. In this work, a PEGylated metal binding peptide (D-K122-4-PEG), derived from bacteria Pseudomonas aeruginosa, was applied on a titanium (Ti) alloy, and the corrosion resistance of the coated alloy specimen was investigated in simulated chloride-containing physiological fluids by electrochemical impedance spectroscopy and micro-electrochemical measurements, surface characterization, and biocompatibility testing...
March 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28262451/retrieval-analysis-of-neck-stem-coupling-in-modular-hip-prostheses
#8
Sherwin L Su, Chelsea N Koch, Thu M Nguyen, Jayme C Burket, Timothy M Wright, Geoffrey H Westrich
BACKGROUND: Dual-taper modular stems have suffered from high revision rates caused by adverse local tissue reactions secondary to fretting and corrosion. We compared the fretting and corrosion behavior of a group of modular neck designs to that of a design that had been recalled for risks associated with fretting and corrosion at the modular neck junction. METHODS: We previously analyzed fretting and corrosion on 60 retrieved Rejuvenate modular neck-stem implants...
February 14, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28258269/ion-release-and-galvanic-corrosion-of-different-orthodontic-brackets-and-wires-in-artificial-saliva
#9
Soodeh Tahmasbi, Tahereh Sheikh, Yasamin B Hemmati
INTRODUCTION: To investigate the galvanic corrosion of brackets manufactured by four different companies coupled with stainless steel (SS) or nickel-titanium (NiTi) wires in an artificial saliva solution. MATERIALS AND METHODS: A total of 24 mandibular central incisor Roth brackets of four different manufacturers (American Orthodontics, Dentaurum, Shinye, ORJ) were used in this experimental study. These brackets were immersed in artificial saliva along with SS or NiTi orthodontic wires (0...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28254324/modification-of-ti6al4v-implant-surfaces-by-biocompatible-tio2-pcl-hybrid-layers-prepared-via-sol-gel-dip-coating-structural-characterization-mechanical-and-corrosion-behavior
#10
Michelina Catauro, Flavia Bollino, Roberto Giovanardi, Paolo Veronesi
Surface modification of metallic implants is a promising strategy to improve tissue tolerance, osseointegration and corrosion resistance of them. In the present work, bioactive and biocompatible organic-inorganic hybrid coatings were prepared using a sol-gel dip coating route. They consist of an inorganic TiO2 matrix in which different percentages of poly(ε-caprolactone) (PCL), a biodegradable and biocompatible polymer, were incorporated. The coatings were used to modify the surface of Ti6Al4V substrates in order to improve their wear and corrosion resistance...
May 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28247484/the-involvement-of-coordinative-interactions-in-the-binding-of-dihydrolipoamide-dehydrogenase-to-titanium-dioxide-localization-of-a-putative-binding-site
#11
Avraham Dayan, Gilad Babin, Assaf Ganoth, Nivin Samir Kayouf, Neta Nitoker Eliaz, Srijana Mukkala, Yossi Tsfadia, Gideon Fleminger
Titanium (Ti) and its alloys are widely used in orthodontic and orthopedic implants by virtue to their high biocompatibility, mechanical strength, and high resistance to corrosion. Biointegration of the implants with the tissue requires strong interactions, which involve biological molecules, proteins in particular, with metal oxide surfaces. An exocellular high-affinity titanium dioxide (TiO2 )-binding protein (TiBP), purified from Rhodococcus ruber, has been previously studied in our lab. This protein was shown to be homologous with the orthologous cytoplasmic rhodococcal dihydrolipoamide dehydrogenase (rhDLDH)...
February 28, 2017: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/28216843/in-vitro-evaluation-of-cytotoxicity-and-corrosion-behavior-of-commercially-pure-titanium-and-ti-6al-4v-alloy-for-dental-implants
#12
Sanchitha Chandar, Ravindra Kotian, Prashanthi Madhyastha, Shama Prasada Kabekkodu, Padmalatha Rao
PURPOSE: The aim of this study was to investigate the cytotoxicity in human gingival fibroblast by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and corrosion behavior by potentiodynamic polarization technique of commercially pure titanium (Ti 12) and its alloy Ti-6Al-4V (Ti 31). MATERIALS AND METHODS: In the present in vitro study, cytotoxicity of Ti 12 and Ti 31 in human gingival fibroblast by MTT assay and the corrosion behavior by potentiodynamic polarization technique in aqueous solutions of 0...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28183674/albumin-coatings-by-alternating-current-electrophoretic-deposition-for-improving-corrosion-resistance-and-bioactivity-of-titanium-implants
#13
Sarah Höhn, Annabel Braem, Bram Neirinck, Sannakaisa Virtanen
Although Ti alloys are generally regarded to be highly corrosion resistant, inflammatory conditions following surgery can instigate breakdown of the TiO2 passivation layer leading to an increased metal ion release. Furthermore proteins present in the surrounding tissue will readily adsorb on a titanium surface after implantation. In this paper alternating current electrophoretic deposition (AC-EPD) of bovine serum albumin (BSA) on Ti6Al4V was investigated in order to increase the corrosion resistance and control the protein adsorption capability of the implant surface...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183670/influence-of-different-grained-powders-and-pellets-made-of-niobium-and-ti-42nb-on-human-cell-viability
#14
Jana Markhoff, Markus Weinmann, Christian Schulze, Rainer Bader
Nowadays, biomaterials can be used to maintain or replace several functions of the human body if necessary. Titanium and its alloys, i.e. Ti6Al4V are the most common materials (70 to 80%) used for structural orthopedic implants due to their unique combination of good mechanical properties, corrosion resistance and biocompatibility. Addition of β-stabilizers, e.g. niobium, can improve the mechanical properties of such titanium alloys further, simultaneously offering excellent biocompatibility. In this in vitro study, human osteoblasts and fibroblasts were cultured on different niobium specimens (Nb Amperit, Nb Ampertec), Nb sheets and Ti-42Nb (sintered and 3D-printed by selective laser melting, SLM) and compared with forged Ti6Al4V specimens...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181449/in%C3%A2-vivo-and-in%C3%A2-vitro-assessment-of-the-biocompatibility-and-degradation-of-high-purity-mg-anastomotic-staples
#15
Su Qu, Jiazeng Xia, Jun Yan, Hongliu Wu, Hao Wang, Yi Yi, Xiaonong Zhang, Shaoxiang Zhang, ChangLi Zhao, Yigang Chen
Titanium (Ti) staples are not biodegradable, and anastomotic complications related to Ti staples are reported frequently. In the present study, the biocompatibility and degradation behavior of high-purity magnesium (HP Mg) staples with the small intestine were investigated. HP Mg staples did not affect the relative growth rate, cell cycle and apoptosis of primary rectal mucosal epithelial cells (IEC-6) in vitro. At one, two and three days after immersion in intestinal juice, the weight of the 30 rinsed HP Mg staples reduced by 7...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28167822/accelerating-corrosion-of-pure-magnesium-co-implanted-with-titanium-in-vivo
#16
Peng Hou, Pei Han, Changli Zhao, Hongliu Wu, Jiahua Ni, Shaoxiang Zhang, Jingyi Liu, Yuanzhuang Zhang, Haidong Xu, Pengfei Cheng, Shen Liu, Yufeng Zheng, Xiaonong Zhang, Yimin Chai
Magnesium is a type of reactive metal, and is susceptible to galvanic corrosion. In the present study, the impact of coexistence of Ti on the corrosion behavior of high purity Mg (HP Mg) was investigated both in vitro and in vivo. Increased corrosion rate of HP Mg was demonstrated when Mg and Ti discs were not in contact. The in vivo experiments further confirmed accelerating corrosion of HP Mg screws when they were co-implanted with Ti screws into Sprague-Dawley rats' femur, spacing 5 and 10 mm. Micro CT scan and 3D reconstruction revealed severe corrosion morphology of HP Mg screws...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28159422/fretting-and-corrosion-between-a-metal-shell-and-metal-liner-may-explain-the-high-rate-of-failure-of-r3-modular-metal-on-metal-hips
#17
Kevin C Ilo, Emma J Derby, Robert K Whittaker, Gordon W Blunn, John A Skinner, Alister J Hart
BACKGROUND: The R3 acetabular system used with its metal liner has higher revision rates when compared to its ceramic and polyethylene liner. In June 2012, the medical and healthcare products regulatory agency issued an alert regarding the metal liner of the R3 acetabular system. METHODS: Six retrieved R3 acetabular systems with metal liners underwent detailed visual analysis using macroscopic and microscopic techniques. RESULTS: Visual analysis discovered corrosion on the backside of the metal liners...
December 22, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28152443/diamond-like-carbon-coatings-with-zirconium-containing-interlayers-for-orthopedic-implants
#18
Dipankar Choudhury, Juergen Lackner, Robert A Fleming, Josh Goss, Jingyi Chen, Min Zou
Six types of diamond-like carbon (DLC) coatings with zirconium (Zr)-containing interlayers on titanium alloy (Ti-6Al-4V) were investigated for improving the biotribological performance of orthopedic implants. The coatings consist of three layers: above the substrate a layer stack of 32 alternating Zr and ZrN sublayers (Zr:ZrN), followed by a layer comprised of Zr and DLC (Zr:DLC), and finally a N-doped DLC layer. The Zr:ZrN layer is designed for increasing load carrying capacity and corrosion resistance; the Zr:DLC layer is for gradual transition of stress, thus enhancing layer adhesion; and the N-doped DLC layer is for decreasing friction, squeaking noises and wear...
January 20, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28130825/magnesium-alloy-az91-exhibits-antimicrobial-properties-in-vitro-but-not-in-vivo
#19
Emily K Brooks, Richard Ahn, Menachem E Tobias, Lisa A Hansen, Nicole R Luke-Marshall, Linda Wild, Anthony A Campagnari, Mark T Ehrensberger
Magnesium alloys hold great promise for developing orthopedic implants that are biocompatible, biodegradable, and mechanically similar to bone tissue. This study evaluated the in vitro and in vivo antimicrobial properties of magnesium-9%aluminum-1%zinc (AZ91) and commercially pure titanium (cpTi) against Acinetobacter baumannii (Ab307). The in vitro results showed that as compared to cpTi, incubation with AZ91 significantly reduced both the planktonic (cpTi = 3.45e8, AZ91 = 8.97e7, p < 0.001) colony forming units (CFU) and biofilm-associated (cpTi = 3...
January 27, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28127744/electrochemical-anodizing-treatment-to-enhance-localized-corrosion-resistance-of-pure-titanium
#20
Davide Prando, Andrea Brenna, Fabio M Bolzoni, Maria V Diamanti, Mariapia Pedeferri, Marco Ormellese
BACKGROUND: Titanium has outstanding corrosion resistance due to the thin protective oxide layer that is formed on its surface. Nevertheless, in harsh and severe environments, pure titanium may suffer localized corrosion. In those conditions, costly titanium alloys containing palladium, nickel and molybdenum are used. This purpose investigated how it is possible to control corrosion, at lower cost, by electrochemical surface treatment on pure titanium, increasing the thickness of the natural oxide layer...
January 26, 2017: Journal of Applied Biomaterials & Functional Materials
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