The Experts below are selected from a list of 19524 Experts worldwide ranked by ideXlab platform
Erlin Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of surface treatments on the surface morphology Corrosion Property and antibacterial Property of ti 10cu sintered alloy
Biomedical Materials, 2015Co-Authors: Erlin ZhangAbstract:Ti–10Cu sintered alloy has shown strong antibacterial properties against S. aureus and E. coli and good cell biocompatibility in vitro and in vivo, displaying potential application as an implant material. Surface treatments are always applied to implants to improve the surface biocompatibility. In this paper, several typically used surface treatments, including sandblasting (SB), sandblasted and large-grits acid etching (SLA), and alkaline heat treatment (AH) were chosen to modify the Ti–10Cu. A cp-Ti (commercially pure titanium) sample was used as control sample. The effect of surface treatments on the Corrosion properties and antibacterial properties of the Ti–10Cu sintered alloy was investigated. After SB and SLA treatments, a rough surface with a TiO2 layer was formed on the surface, which reduced the Corrosion resistance and enhanced the Ti and Cu ion release. After AH treatment, a smooth but microporous surface with a TiO2/titanate layer was formed, which improved slightly the Corrosion resistance. However, the Cu ion and Ti ion release from the Ti–10Cu sample was promoted by AH treatment due to the fact that more Ti2Cu phases were exposed on the AH-treated Ti–10Cu sample. It was demonstrated that the Ti–10Cu samples after surface treatments still exhibited good antibacterial properties against S. aureus, which indicated that the surface treatment did not reduce the antibacterial activity. The control mechanism was thought to be related to the high Cu ion release even after surface treatments. It was expected that the surface treatments provided Ti–10Cu sintered alloy with good surface bioactivity without reduction in antibacterial activity.
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microstructure Corrosion properties and bio compatibility of calcium zinc phosphate coating on pure iron for biomedical application
Materials Science and Engineering: C, 2014Co-Authors: Haiyan Chen, Erlin Zhang, Ke YangAbstract:Abstract In order to improve the biocompatibility and the Corrosion resistance in the initial stage of implantation, a phosphate (CaZn2(PO4)2 · 2H2O) coating was obtained on the surface of pure iron by a chemical reaction method. The anti-Corrosion Property, the blood compatibility and the cell toxicity of the coated pure iron specimens were investigated. The coating was composed of some fine phosphate crystals and the surface of coating was flat and dense enough. The electrochemical data indicated that the Corrosion resistance of the coated pure iron was improved with the increase of phosphating time. When the specimen was phosphated for 30 min, the Corrosion resistance (Rp) increased to 8006 Ω. Compared with that of the naked pure iron, the anti-hemolysis Property and cell compatibility of the coated specimen was improved significantly, while the anti-coagulant Property became slightly worse due to the existence of element calcium. It was thought that phosphating treatment might be an effective method to improve the biocompatibility of pure iron for biomedical application.
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effects of zn on the microstructure mechanical Property and bio Corrosion Property of mg 3ca alloys for biomedical application
Materials Chemistry and Physics, 2011Co-Authors: Hui Du, Erlin ZhangAbstract:Abstract The effects of the addition of Zn element on the microstructures, mechanical properties and bio-Corrosion properties of Mg–3Ca alloys are investigated. The microstructure and X-ray diffraction topography indicate that as-cast Mg–3Ca alloys are composed of primary Mg and eutectic (α-Mg + Mg2Ca) phases, while Mg–3Ca–2Zn alloys are constituted of primary Mg and eutectic (α-Mg + Mg2Ca + Ca2Mg6Zn3) phases. Mechanical properties results show that the element Zn could improve both tensile strength and elongation of Mg–3Ca alloys. The ultimate tensile strength is enhanced by 22%. Meanwhile, the Corrosion resistance is increased by the addition of Zn element. It is thought that the presence of Ca2Mg6Zn3 phase mainly contributes to these improvements. Mg–3Ca–2Zn alloy provides moderate strength and excellent Corrosion resistance for biomedical application.
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effect of zn on mechanical Property and Corrosion Property of extruded mg zn mn alloy
Transactions of Nonferrous Metals Society of China, 2008Co-Authors: Erlin Zhang, Songyan ZengAbstract:The effect of Zn on the microstructure, the mechanical Property and the Corrosion Property in simulated body fluid(SBF) of an extruded Mg-Mn alloy was studied. The results indicate that the addition of Zn element can significantly refine the grain size of the extruded Mg-Mn alloy. When Zn content is increased from 0% to 3%, the grain size decreases from 12 mu m to 4 pm. Meanwhile, the mechanical properties also increase remarkably with increasing Zn content. When Zn content is 3%, the ultimate tensile strength and the yield strength are increased by 54.7 MPa and 69.7 MPa, respectively. Zn can also improve the anti-Corrosion Property of the alloy. The best anti-Corrosion Property is obtained with 1% Zn. However, further increase of Zn content up to 3% deteriorates the Corrosion Property. Finally, the influence mechanism of Zn on the microstructure, the mechanical Property and the Corrosion Property was discussed.
Dezhi Li - One of the best experts on this subject based on the ideXlab platform.
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Corrosion characterization of tin lead and lead free solders in 3 5 wt nacl solution
Corrosion Science, 2008Co-Authors: Dezhi Li, Paul ConwayAbstract:Abstract The Corrosion resistance of Sn–Pb and several candidate lead free solders were investigated in 3.5 wt.% NaCl solution through potentiodynamic polarisation. Results showed that in NaCl solution lead free solders had better Corrosion resistance than Sn–Pb solder and the Corrosion resistance of lead free solders was similar, but the Corrosion resistance of Sn–Ag solder was better than that of Sn–Ag–Cu and Sn–Cu solders. The Corrosion products for Sn–Pb solder had a two-layered structure with Sn-rich phases at the outer layer and looser Pb-rich phases at the inner layer. The loose Pb-rich layer was detrimental to the Corrosion Property. The Corrosion product on the surface of all these solders was tin oxide chloride hydroxide.
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Corrosion characterization of tin-lead and lead free solders in 3.5 wt.% NaCl solution
Corrosion Science, 2008Co-Authors: Dezhi Li, Paul P. Conway, Changqing LiuAbstract:The Corrosion resistance of Sn-Pb and several candidate lead free solders were investigated in 3.5 wt.% NaCl solution through potentiodynamic polarisation. Results showed that in NaCl solution lead free solders had better Corrosion resistance than Sn-Pb solder and the Corrosion resistance of lead free solders was similar, but the Corrosion resistance of Sn-Ag solder was better than that of Sn-Ag-Cu and Sn-Cu solders. The Corrosion products for Sn-Pb solder had a two-layered structure with Sn-rich phases at the outer layer and looser Pb-rich phases at the inner layer. The loose Pb-rich layer was detrimental to the Corrosion Property. The Corrosion product on the surface of all these solders was tin oxide chloride hydroxide. © 2007 Elsevier Ltd. All rights reserved.
Paul Conway - One of the best experts on this subject based on the ideXlab platform.
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Corrosion characterization of tin lead and lead free solders in 3 5 wt nacl solution
Corrosion Science, 2008Co-Authors: Dezhi Li, Paul ConwayAbstract:Abstract The Corrosion resistance of Sn–Pb and several candidate lead free solders were investigated in 3.5 wt.% NaCl solution through potentiodynamic polarisation. Results showed that in NaCl solution lead free solders had better Corrosion resistance than Sn–Pb solder and the Corrosion resistance of lead free solders was similar, but the Corrosion resistance of Sn–Ag solder was better than that of Sn–Ag–Cu and Sn–Cu solders. The Corrosion products for Sn–Pb solder had a two-layered structure with Sn-rich phases at the outer layer and looser Pb-rich phases at the inner layer. The loose Pb-rich layer was detrimental to the Corrosion Property. The Corrosion product on the surface of all these solders was tin oxide chloride hydroxide.
Changqing Liu - One of the best experts on this subject based on the ideXlab platform.
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Corrosion characterization of tin-lead and lead free solders in 3.5 wt.% NaCl solution
Corrosion Science, 2008Co-Authors: Dezhi Li, Paul P. Conway, Changqing LiuAbstract:The Corrosion resistance of Sn-Pb and several candidate lead free solders were investigated in 3.5 wt.% NaCl solution through potentiodynamic polarisation. Results showed that in NaCl solution lead free solders had better Corrosion resistance than Sn-Pb solder and the Corrosion resistance of lead free solders was similar, but the Corrosion resistance of Sn-Ag solder was better than that of Sn-Ag-Cu and Sn-Cu solders. The Corrosion products for Sn-Pb solder had a two-layered structure with Sn-rich phases at the outer layer and looser Pb-rich phases at the inner layer. The loose Pb-rich layer was detrimental to the Corrosion Property. The Corrosion product on the surface of all these solders was tin oxide chloride hydroxide. © 2007 Elsevier Ltd. All rights reserved.
C-w. Chan - One of the best experts on this subject based on the ideXlab platform.
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Laser welding of thin foil nickeltitanium shape memory alloy
Optics and Lasers in Engineering, 2011Co-Authors: C-w. Chan, H.c ManAbstract:In this study, two L27 Taguchi experiments were carried out to study the effect of fibre laser welding parameters and their interactions upon the weld bead aspect ratio of nickeltitanium thin foil. The optimum parameters to produce full penetrated weld with the largest aspect ratio and desirable microstructure were successfully obtained by the Taguchi experimental design. The Corrosion Property of the optimized NiTi weld in Hank's solution at 37.5 ??C was studied and compared with the as-received NiTi. To improve the Corrosion properties of the weld, the effect of post-weld-heat-treatments ranging from 573 to 1173 K was investigated. The Corrosion properties, surface morphology, microstructure and Ti/Ni ratio of the heat-treated NiTi weld were analysed. It was found that a post-weld heat treatment at 573 K for 1 h provided the best pitting Corrosion resistance at the weld zone. ?? 2010 Elsevier Ltd. All rights reserved.
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laser welding of thin foil nickel titanium shape memory alloy
Optics and Lasers in Engineering, 2011Co-Authors: C-w. ChanAbstract:Abstract In this study, two L27 Taguchi experiments were carried out to study the effect of fibre laser welding parameters and their interactions upon the weld bead aspect ratio of nickel–titanium thin foil. The optimum parameters to produce full penetrated weld with the largest aspect ratio and desirable microstructure were successfully obtained by the Taguchi experimental design. The Corrosion Property of the optimized NiTi weld in Hank’s solution at 37.5 °C was studied and compared with the as-received NiTi. To improve the Corrosion properties of the weld, the effect of post-weld-heat-treatments ranging from 573 to 1173 K was investigated. The Corrosion properties, surface morphology, microstructure and Ti/Ni ratio of the heat-treated NiTi weld were analysed. It was found that a post-weld heat treatment at 573 K for 1 h provided the best pitting Corrosion resistance at the weld zone.
