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titanium corrosion

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https://www.readbyqxmd.com/read/29326508/effect-of-ultraviolet-irradiation-on-the-osseointegration-of-a-titanium-alloy-with-bone
#1
Ashish Yadav, Ranjana Yadav, Aratee Gupta, Akash Baranwal, Atul Bhatnagar, Vakil Singh
Introduction: Attempt has been made to analyze the potential of titanium (Ti) alloy for osteointegration by the effect of surface photo functionalization in different aspects as follows: in Ringer's solution, in vitro cell growth, and in vivo study on rabbit. The present study was aimed to investigate the influence of ultraviolet (UV) light on surface topography, corrosion behavior, and bioactivity of indigenously manufactured samples of Ti alloy mini-implant. Materials and Methods: The study includes surface modification of Ti samples by UV treatment, corrosion testing of the specimens using Potentiostat (GAMRY System), qualitative examination of modified surface topography using scanning electron microscope, and cellular viability test on Ti alloy surface (3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide ASSAY)...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29322635/the-effect-of-cell-density-proximity-and-time-on-the-cytotoxicity-of-magnesium-and-galvanically-coupled-magnesium-titanium-particles-in-vitro
#2
Jua Kim, Jeremy L Gilbert
Magnesium (Mg) and galvanically-coupled magnesium-titanium (Mg-Ti) particles in vitro have been reported previously to kill cells in a dosage-dependent manner. Mg-Ti particles kill cells more effectively than Mg alone, due to the galvanic effect of Mg and Ti. This study further investigated the in vitro cytotoxicity of Mg and Mg-Ti in terms of particle concentration, cell density, time, and proximity. Cell density has an effect on cell viability only at low particle concentrations (below 250 µg/ml), where cell viability dropped only for lower cell densities (5,000-10,000 cells/cm2 ) and not for higher cell densities (20,000-30,000 cells/cm2 ), showing that the particles cannot kill if there are more cells present...
January 11, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29322629/material-dependent-fretting-corrosion-in-spinal-fusion-devices-evaluation-of-onset-and-long-term-response
#3
Vaneet Singh, Jacob P Shorez, Sachin A Mali, Nadim J Hallab, Jeremy L Gilbert
Posterior spinal fusion implants include number of interconnecting components, which are subjected to micromotion under physiological loading conditions inducing a potential for fretting corrosion. There is very little known about the fretting corrosion in these devices in terms of the minimum angular displacement (threshold) necessary to induce fretting corrosion or the amount of fretting corrosion that can arise during the life of the implant. Therefore, the first goal was to evaluate the threshold fretting corrosion in three anatomical orientations and second the long-term fretting corrosion for the three different material types of spinal implants under physiological loading conditions...
January 10, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29319895/the-onset-of-fretting-at-the-head-stem-connection-in-hip-arthroplasty-is-affected-by-head-material-and-trunnion-design-under-simulated-corrosion-conditions
#4
Fiachra E Rowan, Amanda Wach, Timothy M Wright, Douglas E Padgett
Mechanically assisted crevice corrosion (MACC) is a mechanism for trunnion damage in total hip arthroplasties (THAs). Retrieval studies have shown reduced MACC-related damage for ceramic heads compared with cobalt-chromium (CoCr) heads. We propose that ceramic heads demonstrate fretting at higher cyclic compressive loads than CoCr heads on titanium alloy trunnions in a simulated corrosion model. A closed electrochemical chamber was used to measure fretting current onset loads for two modern titanium alloy trunnions (Zimmer 12/14 and Stryker V-40) in which trunnion failure has been reported...
January 10, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29260813/constructing-a-novel-strategy-for-controllable-synthesis-of-corrosion-resistant-ti3-self-doped-titanium-silicon-materials-with-efficient-hydrogen-evolution-activity-from-simulated-seawater
#5
Ting Song, Piyong Zhang, Tingting Wang, Atif Ali, Heping Zeng
Exploiting solar power for hydrogen production from seawater is a great challenge owing to the corrosive properties of seawater and inadequate visible-light conversion capabilities. Here we report an uncomplicated post-processing method to construct Ti3+ self-doped titanium-silicon material with corrosion resistance. This is a new experimental method to regulate the electrical, optical, and photocatalytic performances of titanium-containing photocatalysts in a controlled way. Moreover, we demonstrate that Ti-O-Si materials with different calcination temperatures can serve as a highly efficient and convenient catalyst for photogeneration of hydrogen from water and simulated seawater...
December 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/29245125/delayed-type-hypersensitivity-to-metals-in-connective-tissue-diseases-and-fibromyalgia
#6
REVIEW
Geir Bjørklund, Maryam Dadar, Jan Aaseth
Rheumatic diseases include a group of autoimmune disorders with environmental and genetic etiology that are characterized as a subgroup of connective tissue diseases (CTD). Rheumatoid arthritis (RA) often involves the small joints of the hands in a symmetrical fashion that can lead to loss of joint function, and RA, as well as Sjögren's syndrome (SS) and other rheumatic diseases, are often accompanied by sensitivity to metals. Numerous investigations on metal sensitivity were evaluated in this review. A detailed metal exposure history was collected by different evaluation of studies...
December 12, 2017: Environmental Research
https://www.readbyqxmd.com/read/29230457/influence-of-macroscopic-defects-on-the-corrosion-behavior-of-u-0-79-wt-ti-alloy-in-sodium-chloride-solution
#7
Dingzhou Cai, Ming Wang, Yiming Ren, Shanli Yang, Ge Sang, Yingru Li
Uranium alloys containing a low concentration of titanium have received wide attention due to their greatly enhanced corrosion resistance and outstanding mechanical performances. Herein, we investigated the effect of macroscopic defects on the corrosion behavior of U-0.79 wt%Ti (denoted as U-Ti) alloy in 0.01 M NaCl solution using traditional electrochemical testing technologies and a novel scanning electrochemical composite probe (SECP). The results demonstrate that pitting corrosion occurs rapidly on the alloy surface due to macroscopic defects...
December 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29214721/surface-characterization-of-titanium-implant-healing-abutments-before-and-after-placement
#8
Sutton E Wheelis, Thomas G Wilson, Pilar Valderrama, Danieli C Rodrigues
BACKGROUND: Implant healing abutments (IHA) have a vital role in soft tissue healing after implant placement. Although there is thorough investigation on the implant surface, little is known about the effects potentially damaging oral conditions impose on healing abutments. PURPOSE: To characterize the surface of titanium healing abutments before and after clinical placement to understand the effects of the oral environment and time on the device surface. MATERIALS AND METHODS: Ten regular Straumann IHA were subjected to characterization pre and postplacement to elucidate the effects of the oral environment on device surfaces...
December 6, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29204482/corrosion-and-adverse-local-tissue-reaction-after-total-hip-arthroplasty-with-a-modular-titanium-alloy-femoral-neck
#9
Colin D Canham, Pavel I Muradov, Jordan B Simpson, Stephen J Incavo
This report describes a case of mechanically assisted crevice corrosion and secondary adverse local tissue reaction in a patient following a total hip arthroplasty, utilizing a modular neck (bi-modular) femoral component. Radiographic evaluation demonstrated a well-positioned, stable, cementless arthroplasty. Upon further evaluation, the patient had elevated serum cobalt and chromium levels, and magnetic resonance imaging demonstrated a periprosthetic pseudotumor. Corrosion of both the neck-stem and head-neck junctions was suspected...
December 2017: Arthroplasty Today
https://www.readbyqxmd.com/read/29196871/three-cases-of-metallosis-associated-with-spine-instrumentation
#10
Reed Ayers, Mackenzie Miller, Jeffery Schowinsky, Evalina Burger, Vikas Patel, Christopher Kleck
The characteristic trait of metallosis is the presence of tissue staining. Analyzing explanted revision hardware from spine surgeries and performing ICPMS/AES analysis on removed tissue samples, a clinically relevant definition for metallosis may be developed. Results of the analysis identified hardware fretting wear and corrosion, and ICP-MS/AES analysis identified elevated metal ion concentrations in all cases. This supports the hypothesis that corrosion may be linked to poor health outcomes and potential need for revision surgery...
December 1, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29192718/corrosion-of-titanium-part-2-effects-of-surface-treatments
#11
Davide Prando, Andrea Brenna, Maria Vittoria Diamanti, Silvia Beretta, Fabio Bolzoni, Marco Ormellese, MariaPia Pedeferri
Titanium is well known as one of the most corrosion-resistant metals. However, it can suffer corrosion attacks in some specific aggressive conditions. To further increase its corrosion resistance, it is possible either to modify its surface, tuning either thickness, composition, morphology or structure of the oxide that spontaneously forms on the metal, or to modify its bulk composition. Part 2 of this review is dedicated to the corrosion of titanium and focuses on possible titanium treatments that can increase corrosion resistance...
November 21, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29192548/in-vivo-study-on-biodegradable-magnesium-alloys-bone-healing-around-we43-screws
#12
Jitka Levorova, Jaroslava Duskova, Milan Drahos, Radka Vrbova, D Vojtech, Jiri Kubasek, Martin Bartos, Lenka Dugova, Dan Ulmann, Rene Foltan
Introduction A standard osteosynthetic material for maxillofacial skeleton is titanium and its alloys. The convenience of degradable material is avoiding of second surgery in cases, where removal of the material is necessary. Magnesium biodegradable alloys have similar mechanic properties as cortical bone - reasonable corrosion and sufficient biologic properties. They might be used in facial skeleton fixation. Materials and methods The study included a total of 16 rabbits, and they were randomly divided into two groups...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29189776/mild-oxidation-of-methane-to-methanol-or-acetic-acid-on-supported-isolated-rhodium-catalysts
#13
Junjun Shan, Mengwei Li, Lawrence F Allard, Sungsik Lee, Maria Flytzani-Stephanopoulos
An efficient and direct method of catalytic conversion of methane to liquid methanol and other oxygenates would be of considerable practical value. However, it remains an unsolved problem in catalysis, as typically it involves expensive or corrosive oxidants or reaction media that are not amenable to commercialization. Although methane can be directly converted to methanol using molecular oxygen under mild conditions in the gas phase, the process is either stoichiometric (and therefore requires a water extraction step) or is too slow and low-yielding to be practical...
November 29, 2017: Nature
https://www.readbyqxmd.com/read/29182174/controllable-synthesis-of-titanium-nitride-nanotubes-by-coaxial-electrospinning-and-their-application-as-a-durable-support-for-oxygen-reduction-reaction-electrocatalysts
#14
Zetao Ding, Qingqing Cheng, Liangliang Zou, Jianhui Fang, Zhiqing Zou, Hui Yang
Chemical and electrochemical corrosion of a support limits the corresponding catalyst's performance and lifetime. In this paper, uniform TiN nanotubes are synthesized via coaxial-electrospinning, thermal oxidation and nitridation. The average diameter of nanotubes can be facilely controlled by tuning the parameters of coaxial electrospinning. The TiN nanotubes are modified further with Pt nanoparticles as Pt/TiN NT electrocatalysts. After accelerated durability tests, the electrochemical surface area (ECSA) and mass activity of the Pt/TiN decrease by only 6% and 14% respectively, while those of the Pt/C decrease by 44% and 46...
November 28, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29156353/in-situ-formation-of-textured-tin-coatings-on-biomedical-titanium-alloy-by-laser-irradiation
#15
Xueyang Zhao, Peng Zhang, Xiaojian Wang, Yun Chen, Hui Liu, Lianxi Chen, Yinying Sheng, Wei Li
The Ti-35Nb-7Zr-5Ta (TNZT) alloy has received much research attention among the biomedical titanium alloys for its low Young's modulus and outstanding biocompatibility. This paper provided an innovative technique for improving the wear and corrosion resistance of the TNZT alloy, by developing in-situ formed TiN coatings on the surface of the TNZT alloy through laser irradiation. The new technique combines the advantages of laser surface texturing and laser gas alloying. The experimental results showed that the phase compositions of the textured TNZT samples were β-Ti, martensitic α'' phase and TiN after laser texturing in N2...
November 14, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29156291/engineering-the-next-generation-tin-containing-%C3%AE-titanium-alloys-with-high-strength-and-low-modulus-for-orthopedic-applications
#16
Sumit Bahl, Suvam Das, Satyam Suwas, Kaushik Chatterjee
Metastable β Ti alloys are the new emerging class of biomaterial for load bearing orthopedic applications. However, these alloys in the single β phase microstructure have insufficient strength for use in load bearing applications. It is imperative to strengthen these alloys by carefully designed thermo-mechanical processing routes that typically involve aging treatment. In this investigation two newly designed Sn based β Ti alloys of composition Ti-32Nb-(2, 4) Sn are evaluated. The effects of Sn content on the mechanical properties and biological performance of these alloys processed through designed thermo-mechanical processing route are investigated...
November 11, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29152495/midterm-outcomes-of-titanium-modular-femoral-necks-in-total-hip-arthroplasty
#17
Thurial Collet, Jean-Pierre Atanasiu, Jean-Baptiste de Cussac, Kamal Oufroukhi, Hugo Bothorel, Mo Saffarini, François Badatcheff
Background: Modular femoral necks present surgical and biomechanical advantages in total hip arthroplasty (THA), but their benefits remain controversial due to risks of corrosion and fracture at the additional junction. This study aimed to report 10-year survival and clinical outcomes of a titanium femoral stem with a titanium modular neck in consecutive series. Methods: The authors reviewed the records of 97 patients (99 THAs) using uncemented modular stem and ceramic-on-ceramic acetabular components...
October 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29131299/corrosion-of-titanium-part-1-aggressive-environments-and-main-forms-of-degradation
#18
Davide Prando, Andrea Brenna, Maria Vittoria Diamanti, Silvia Beretta, Fabio Bolzoni, Marco Ormellese, MariaPia Pedeferri
Titanium has outstanding corrosion resistance due to the external natural oxide protective layer formed when it is exposed to an aerated environment. Despite this, titanium may suffer different forms of corrosion in severe environments: uniform corrosion, pitting and crevice corrosion, hydrogen embrittlement, stress-corrosion cracking, fretting corrosion and erosion. In this first review, forms of corrosion affecting titanium are analyzed based on a wide literature review. For each form of corrosion, the mechanism and most severe environment are reported according to the current understanding...
November 11, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29109336/corrosion-resistance-and-mechanical-properties-of-titanium-nitride-plating-on-orthodontic-wires
#19
Haruki Sugisawa, Hideki Kitaura, Kyosuke Ueda, Keisuke Kimura, Masahiko Ishida, Yumiko Ochi, Akiko Kishikawa, Saika Ogawa, Teruko Takano-Yamamoto
Titanium nitride (TiN) coating by ion plating has properties such as high hardness, wear resistance, corrosion resistance, and surface lubricity, therefore TiN coating is often used in various dental appliances and materials. In this study, we evaluated the corrosion behaviors and mechanical properties of TiN coated stainless steel (SS) and nickel titanium (Ni-Ti) orthodontic wires prepared by ion plating. TiN coating by ion plating improves the corrosion resistance of orthodontic wires. The corrosion pitting of the TiN coated wire surface become small...
November 3, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29105561/failure-of-an-accis-metal-on-metal-hip-resurfacing-prosthesis-a-case-report
#20
Martin C Bone, Andrew Naylor
The introduction of coatings on joint replacements was intended to reduce wear volumes, prevent corrosion and reduce metal ion release. However, retrieval analysis to confirm their in vivo performance has been limited. The aim of study was to examine the coating on a retrieved hip prosthesis to determine whether substantial damage or wear had occurred. A single advanced ceramic-coated implant systems titanium niobium nitride-coated hip resurfacing prosthesis was retrieved for examination. Wear volumes and surface roughness were measured to quantify the damage to the articulating surfaces...
November 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
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