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Surface modification and corrosion behaviour of Ni-Ti alloy used for urological implants  [PDF]
W. Kajzer,M. Kaczmarek,A. Krauze,J. Marciniak
Archives of Materials Science and Engineering , 2007,
Abstract: Purpose: The work presents the influence of the surface treatment of Ni-Ti alloy, intended for implants applied in urogenital surgery, on their corrosion resistance. The tests were carried out in the simulated urine. In particular, the pitting and crevice corrosion resistance tests were carried out.Design/methodology/approach: The corrosion tests were realized by recording of anodic polarization curves with the use of the potentiodynamic method. The VoltaLab PGP 201 system for electrochemical tests was applied. The tests were carried out in electrolyte simulating urine (pH = 5,6 ÷ 6,4) at the temperature of 37±1°C. The tests were carried out on samples of the following surfaces: grinded – average roughness Ra = 0,16 μm and electropolished and chemically passivated average roughness Ra = 0,10 μm.Findings: Surface condition of Ni-Ti alloys determines its corrosion resistance.Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the Ni-Ti alloy.Practical implications: On the basis of the obtained results it can be stated that Ni-Ti alloy can be applied in urology.Originality/value: The paper presents the influence of the surface treatment on corrosion resistance of Ni-Ti alloy.
Surface modification and corrosion resistance of Ni-Ti alloy used for urological stents  [PDF]
W. Kajzer,M. Kaczmarek,A. Krauze,J. Marciniak
Journal of Achievements in Materials and Manufacturing Engineering , 2007,
Abstract: Purpose: The work presents the influence of the surface treatment of Ni-Ti alloy, intended for implants applied inurogenital surgery, on their corrosion resistance. The tests were carried out in the simulated urine at the temperature37±1oC and pH = 5.6÷6.4. In particular, the pitting and crevice corrosion resistance tests were carried out.Design/methodology/approach: The corrosion tests were realized by recording of anodic polarization curveswith the use of the potentiodynamic method. The VoltaLab PGP 201 system for electrochemical tests wasapplied. The tests were carried out in electrolyte simulating urine (pH = 5.6 ÷ 6.4) at the temperature of 37±1oC.Findings: Surface condition of metallic biomaterial determines its corrosion resistance.Research limitations/implications: The obtained results are the basis for the optimization of physicochemicalproperties of the Ni-Ti alloy.Practical implications: On the basis of the obtained results it can be stated that Ni-Ti alloy can be applied in urology.Originality/value: The paper presents the influence of the surface treatment on corrosion resistance of Ni-Ti alloy.
INFLUENCE OF SURFACE MODIFICATION OF Ti BY FLUORINE ION-IMPLANTATION ON FORMATION AND EXPRESSION OF COLLAGEN-I ON OSTEOBLAST
刘慧颖,王学金,王浪平,王小峰,艾红军
金属学报 , 2008,
Abstract: 应用等离子体浸没离子注入装置对纯Ti表面进行氟离子注入, 通过SEM和XPS分析研究材料的表面形貌和化学组成. 将MG-63成骨细胞接种于氟离子注入前、后的 Ti样品表面, 采用激光共聚焦显微镜观察材料表面对成骨样细胞MG-63 I型胶原形成的影响; 逆转录聚合酶链反应检测I型胶原mRNA的表达; 蛋白印迹法检测I型胶原蛋白的表达. 结果表明, 氟离子注入后Ti样品表面新出现TiF3; 且MG-63细胞在其表面分别培养6, 24和48 h后, I型胶原的形成和表达均明显高于纯Ti表面. 含氟表面改性层可提高Ti材料的生物相容性.
Hybrid processing of Ti-6Al-4V using plasma immersion ion implantation combined with plasma nitriding
Silva, Maria Margareth da;Ueda, Mário;Otani, Choyu;Reuther, Helfried;Lepienski, Carlos Maurício;Soares Junior, Paulo César;Otubo, Jorge;
Materials Research , 2006, DOI: 10.1590/S1516-14392006000100018
Abstract: based on the fact that the ti-6al-4v alloy has good mechanical properties, excellent resistance to corrosion and also excellent biocompatibility, however with low wear resistance, this work aims to test plasma processes or combination of plasma and ion implantation processes to improve these characteristics. two types of processing were used: two steps piii (plasma immersion ion implantation) combined with pn (plasma nitriding) and single step piii treatment. according to auger electron spectroscopy (aes) results, the best solution was obtained by piii for 150 minutes resulting in ~ 65 nm of nitrogen implanted layer, while the sample treated with piii (75 minutes) and pn (75 minutes) reached ~ 35 nm implanted layer. the improvement of surface properties could also be confirmed by the nanoindentation technique, with values of hardness increasing for both processes. afm (atomic force microscopy) characterization showed that the single step piii process presented greater efficiency than the duplex process (piii + pn), probably due to the sputtering occurring during the second step (pn) removing partially the implanted layer of first step (piii).
Hybrid processing of Ti-6Al-4V using plasma immersion ion implantation combined with plasma nitriding
Silva Maria Margareth da,Ueda Mário,Otani Choyu,Reuther Helfried
Materials Research , 2006,
Abstract: Based on the fact that the Ti-6Al-4V alloy has good mechanical properties, excellent resistance to corrosion and also excellent biocompatibility, however with low wear resistance, this work aims to test plasma processes or combination of plasma and ion implantation processes to improve these characteristics. Two types of processing were used: two steps PIII (Plasma Immersion Ion Implantation) combined with PN (Plasma Nitriding) and single step PIII treatment. According to Auger Electron Spectroscopy (AES) results, the best solution was obtained by PIII for 150 minutes resulting in ~ 65 nm of nitrogen implanted layer, while the sample treated with PIII (75 minutes) and PN (75 minutes) reached ~ 35 nm implanted layer. The improvement of surface properties could also be confirmed by the nanoindentation technique, with values of hardness increasing for both processes. AFM (Atomic Force Microscopy) characterization showed that the single step PIII process presented greater efficiency than the duplex process (PIII + PN), probably due to the sputtering occurring during the second step (PN) removing partially the implanted layer of first step (PIII).
STUDY OF THE CORROSION BEHAVIOR IMPROVED BY TITANIUM ION IMPLANTATION FOR LEAD AND LEAD-ANTIMONY ALLOY
钛离子注入改良铅和铅锑合金腐蚀行为的研究

ZHANG Shengtao,HUANG Zongqing,
张胜涛
,黄宗卿

腐蚀科学与防护技术 , 1994,
Abstract: Corrosion properties of lead and lead-4% antimony alloy in 5mol/ L H2SO4 may be improved by titanium ion implantation.The innuence of titanium ion implantation on the corrosion behavior is discussed.There are two processes for the corrosion of lead in sulfuric acid:oxidation and hydrogen reduction.Titanium ion implantation has different influences on the processes. The distribution of titanium on the surfaces of lead and lead-antimony alloy is related to the dose of implanted titanium.
Study of corrosion effect of Pt on Ti alloys by recursion method
递归法研究Pt对Ti合金腐蚀影响

Liu Gui-Li,
刘贵立

物理学报 , 2009,
Abstract: The electronic structure parameters of pure Ti and TiPt alloy, such as density of states, Fermi energy level, environment-sensitive embedding energy and order energy have been calculated by recursion method. The environment-sensitive embedding energy induced by Pt in Ti crystal is greater than that on Ti surface, so Pt is prone to gather on Ti surface. The order energy between Pt atoms is positive, which leads Pt atoms to form intermetallics with bulk Ti atoms. The electric potential of intermetallics is lower than that of Ti atom cluster at Ti alloy surface, so cells will form between intermetallics and Ti atom clusters, then the intermetallic will decompose in corrosive medium. With the deposition of Pt, a rough electrocatalytic Pt layer would form on the surface of Ti alloy. This electrocatalytic Pt layer enhances the passivation of Ti alloy and improves the corrosion resistance of Ti alloy.
CORROSION RESISTANCE OF Zr41.5Ti14Cu13Ni10Be22.5 BULK AMORPHOUS ALLOY
Zr41.5Ti14Cu13Ni10Be22.5大块非晶的耐蚀性能

QIN Xiujuan,
秦秀娟

腐蚀科学与防护技术 , 2003,
Abstract: Corrosion resistance of Zr 41.5Ti 14Cu 13Ni 10Be 22.5 bulk amorphous alloy in several kinds of solutions was studied by using the method of immersion.Compared with other materials,Zr 41.5Ti 14Cu 13Ni 10Be 22.5 bulk amorphous alloy exhibits good corrosion resistance.
The Corrosion Behavior of Sputter-deposited W-Ti Alloys in 0.5 M NaCl Solution  [PDF]
Jagadeesh Bhattarai
Nepal Journal of Science and Technology , 2009, DOI: 10.3126/njst.v10i0.2899
Abstract: The corrosion behavior of the sputter-deposited amorphous or nanocrystalline W-Ti alloys was studied in neutral 0.5 MNaCl solution at 25°C, open to air by immersion tests, electrochemical measurements and confocal scanning laser microscopic(CSLM) techniques. Titanium metal acts synergistically with tungsten in enhancing the corrosion resistance of the sputter-deposited W-Ti alloys so as to show higher corrosion resistance than those of alloy-constituting elements (that is, tungsten and titanium) in neutral 0.5 M NaCl solution. In particular, the amorphous W-Ti alloys containing 30-53 at% titanium showed lowest corrosion rates (that is, about 1 × 10 -3 mm.y -1 ). Open circuit potentials of all the examined W-Ti alloys were shifted to more noble direction than those of the open circuit potentials of?alloyconstituting elements in 0.5 M NaCl solution. Key words: Sputter deposition; W-Ti alloys; Corrosion-resistant; CSLM; NaCl solution. DOI: 10.3126/njst.v10i0.2899 Nepal Journal of Science and Technology Volume 10, 2009 December Page:109-113 ?
Quick-homogeneous Corrosion of Ti-2A1-2.5Zr Alloy in High-temperature and High-pressure Water Steam
Lin YANG,Zhentao YU,Ju DENG,

材料科学技术学报 , 2001,
Abstract: The corrosion behavior of Ti-2A1-2.5Zr alloy with 5 alloy contents and 5 surface states were studied in water steam at 400℃, 10.3 MPa for 72 h. The weight-increments of all samples are under 4 mg/dm2, better than Zr and Zr-alloy. or-Ti is oxidized into anatase-type TiO2 preferentially. The corrosion resistance is improved by adding Al element or pre-oxidizing treatment, the latter is more effective relatively.
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