The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

K.y. Luo - One of the best experts on this subject based on the ideXlab platform.

  • Effects of coverage layer on the electrochemical corrosion behaviour of Mg-Al-Mn alloy subjected to massive laser shock peening treatment
    Journal of Alloys and Compounds, 2019
    Co-Authors: K.y. Luo, Cheng Wang, C.y. Cui
    Abstract:

    Abstract Effects of coverage layer on electrochemical corrosion behaviour and pitting morphologies of Mg-Al-Mn alloy subjected to massive laser shock peening (LSP) treatment were investigated by Potentiodynamic Polarisation Test, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) observations. Microstructures of Mg-Al-Mn alloy subjected to massive LSP treatment were also characterized. Results showed that LSP induced an obvious improvement in electrochemical corrosion resistance with increasing coverage layer. Even in a higher corrosive solution concentration, LSP could still prevent corrosion to some extent. The improvement in electrochemical corrosion resistance was due to the grain refinement and compressive residual stress induced by massive LSP treatment. Finally, the influence mechanism of the coverage layer on electrochemical corrosion behaviour of Mg-Al-Mn alloy was revealed.

  • electrochemical and pitting corrosion resistance of aisi 4145 steel subjected to massive laser shock peening treatment with different coverage layers
    Optics and Laser Technology, 2017
    Co-Authors: Bingyuan Han, C.y. Cui, K.y. Luo
    Abstract:

    Abstract The effects of massive laser shock peening (LSP) treatment with different coverage layers on residual stress, pitting morphologies in a standard corrosive solution and electrochemical corrosion resistance of AISI 4145 steel were investigated by pitting corrosion Test, Potentiodynamic Polarisation Test, and SEM observations. Results showed massive LSP treatment can effectively cause an obvious improvement of pitting corrosion resistance of AISI 4145 steel, and increased coverage layer can also gradually improve its corrosion resistance. Massive LSP treatment with multiple layers was shown to influence pitting corrosion behaviour in a standard corrosive solution.

  • corrosion behaviour of aisi 304 stainless steel subjected to massive laser shock peening impacts with different pulse energies
    Corrosion Science, 2014
    Co-Authors: K.y. Luo, M Luo, Xiaonong Cheng
    Abstract:

    Abstract Effects of massive laser shock peening (LSP) impacts with different pulse energies on ultimate tensile strength (UTS), stress corrosion cracking (SCC) susceptibility, fracture appearance and electrochemical corrosion resistance of AISI 304 stainless steel were investigated by slow strain rate Test, Potentiodynamic Polarisation Test and scanning electron microscope observation. The influence mechanism of massive LSP impacts with different pulse energies on corrosion behaviour was also determined. Results showed that massive LSP impacts effectively caused a significant improvement on UTS, SCC resistance, and electrochemical corrosion resistance of AISI 304 stainless steel. Increased pulse energy can also gradually improve its corrosion resistance.

Xiaofeng Pang - One of the best experts on this subject based on the ideXlab platform.

  • osteoblastic cell responses and antibacterial efficacy of cu zn co substituted hydroxyapatite coatings on pure titanium using electrodeposition method
    RSC Advances, 2015
    Co-Authors: Yong Huang, Xuejiao Zhang, Ranlin Zhao, Huanhuan Mao, Yajing Yan, Xiaofeng Pang
    Abstract:

    Effective physiological bone integration and absence of bacterial infection are essential for a successful orthopaedic or dental implant. This work elucidated the antibacterial efficacy and cytocompatibility of an electroplated Cu(II) and Zn(II) co-substituted hydroxyapatite (HAP) (i.e., ZnCuHAP) coating on commercially pure titanium (Ti-cp). To improve the antibacterial property of pure HAP, Cu2+ was substituted into its structure. Simultaneously, Zn2+ is co-substituted as a secondary material into CuHAP to offset the potential cytotoxicity of Cu, because an elevated Cu concentration is toxic. The as-deposited coatings were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Co-doping of Zn2+ and Cu2+ into HAP reduced the porosity, resulting in a denser coating. The Zn2+ and Cu2+ ions were homogenously co-deposited into HAP films. Potentiodynamic Polarisation Test revealed that the ZnCuHAP covered coating provided good barrier characteristics and achieved superior corrosion protection for Ti substrates. The as-prepared ZnCuHAP coating was found to be highly effective against Escherichia coli in vitro. In vitro biocompatibility Tests and MTT were employed to assess the cytotoxicity of ZnCuHAP coating with osteoblast-like MC3T3-E1 cells. No adverse effect or cytotoxicity on osteoblasts by Zn/Cu addition was observed, revealing that the co-substitution of Zn in CuHAP efficiently offsets the adverse effects of Cu and improves the performance compared with that of pure HAP.

  • Antibacterial efficacy, corrosion resistance, and cytotoxicity studies of copper-substituted carbonated hydroxyapatite coating on titanium substrate
    Journal of Materials Science, 2014
    Co-Authors: Yong Huang, Xuejiao Zhang, Ranlin Zhao, Huanhuan Mao, Yajing Yan, Xiaofeng Pang
    Abstract:

    This work elucidated the antibacterial efficacy, corrosion resistance, and cytotoxicity of electroplated copper-substituted hydroxyapatite (CuHAP) coating on titanium (Ti). The fabricated CuHAP coatings were characterized by scanning electron microscopy, energy-dispersive X-ray analysis spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction studies. The CuHAP coating had needle-like apatite crystals, the doping of Cu2+ into HAP reduced porosity, and the coating became denser. The CuHAP crystals were carbonated with a few of Cu2+ incorporation (about 0.80 wt%). The Cu2+ ions were homogenously deposited into HAP films. Potentiodynamic Polarisation Test revealed that the CuHAP coating provided good barrier characteristics and achieved superior corrosion protection for Ti substrates. The in vitro antibacterial activity of as-prepared CuHAP coating was evaluated against Escherichia coli and was found to be effectively high against bacterial colonization. Bioactivity Test conducted by soaking the coatings in simulated body fluid demonstrated that CuHAP coating can quickly induce bone-like apatite nucleation and growth. In vitro biocompatibility Tests, MTT, were employed to assess the cytotoxicity of CuHAP coating with osteoblast-like MC3T3-E1 cells. The obtained HAP coating doped with a low content of Cu2+ exhibited good cytocompatibility and had no toxicity toward MC3T3-E1.

  • In vitro cytocompatibility and corrosion resistance of zinc-doped hydroxyapatite coatings on a titanium substrate
    Journal of Materials Science, 2014
    Co-Authors: Qiongqiong Ding, Yong Huang, Xuejiao Zhang, Yajing Yan, Xiaofeng Pang
    Abstract:

    To improve biocompatibility and corrosion resistance during the initial implantation stage, zinc-substituted hydroxyapatite (ZnHAp) coating was fabricated on pure titanium by the electrolytic deposition method. The morphology, microstructure and chemical composition of the coating were investigated by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis and Fourier transform infrared spectroscopy. The prepared ZnHAp crystals were calcium deficient and were carbonated owing to the incorporation of some Zn2+. This incorporation of Zn2+ into the HAp significantly reduced porosity and caused the coating to become noticeably denser. In addition, the Zn2+ ions were homogeneously distributed in the coating. The Potentiodynamic Polarisation Test revealed that the ZnHAp-coated surface showed superior corrosion resistance over that of the HAp-coated surface and bare Ti. The in vitro bioactivity was evaluated in a simulated body fluid, which revealed that the ZnHAp coating can rapidly induce bone-like apatite formation of nuclear and growth features. In addition, the cell response Tests showed that the MC3T3-E1 cells on the ZnHAp coating clearly enhanced the in vitro cytocompatibility of Ti compared with the same cells on HAp coating. ZnHAp coating was thus beneficial for improving biocompatibility.

  • Characterisation, corrosion resistance and in vitro bioactivity of manganese-doped hydroxyapatite films electrodeposited on titanium
    Journal of materials science. Materials in medicine, 2013
    Co-Authors: Yong Huang, Yajing Yan, Qiongqiong Ding, Shuguang Han, Xiaofeng Pang
    Abstract:

    This work elucidated the corrosion resistance and in vitro bioactivity of electroplated manganese-doped hydroxyapatite (MnHAp) film on NaOH-treated titanium (Ti). The NaOH treatment process was performed on Ti surface to enhance the adhesion of the MnHAp coating on Ti. Scanning electron microscopy images showed that the MnHAp coating had needle-like apatite crystals, and the approximately 10 μm thick layer was denser than HAp. Energy-dispersive X-ray spectroscopy analysis revealed that the MnHAp crystals were Ca-deficient and the Mn/P molar ratio was 0.048. X-ray diffraction confirmed the presence of single-phase MnHAp, which was aligned vertically to the substrate. Fourier transform infrared spectroscopy indicated the presence of phosphate bands ranging from 500 to 650 and 900 to 1,100 cm−1, and a hydroxyl band at 3,571 cm−1, which was characteristic of HAp. Bond strength Test revealed that adhesion for the MnHAp coating was more enhanced than that of the HAp coating. Potentiodynamic Polarisation Test showed that the MnHAp-coated surface exhibited superior corrosion resistance over the HAp single-coated surface. Bioactivity Test conducted by immersing the coatings in simulated body fluid showed that MnHAp coating can rapidly induce bone-like apatite nucleation and growth. Osteoblast cellular Tests revealed that the MnHAp coating was better at improving the in vitro biocompatibility of Ti than the HAp coating.

C.y. Cui - One of the best experts on this subject based on the ideXlab platform.

  • Effects of coverage layer on the electrochemical corrosion behaviour of Mg-Al-Mn alloy subjected to massive laser shock peening treatment
    Journal of Alloys and Compounds, 2019
    Co-Authors: K.y. Luo, Cheng Wang, C.y. Cui
    Abstract:

    Abstract Effects of coverage layer on electrochemical corrosion behaviour and pitting morphologies of Mg-Al-Mn alloy subjected to massive laser shock peening (LSP) treatment were investigated by Potentiodynamic Polarisation Test, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) observations. Microstructures of Mg-Al-Mn alloy subjected to massive LSP treatment were also characterized. Results showed that LSP induced an obvious improvement in electrochemical corrosion resistance with increasing coverage layer. Even in a higher corrosive solution concentration, LSP could still prevent corrosion to some extent. The improvement in electrochemical corrosion resistance was due to the grain refinement and compressive residual stress induced by massive LSP treatment. Finally, the influence mechanism of the coverage layer on electrochemical corrosion behaviour of Mg-Al-Mn alloy was revealed.

  • electrochemical and pitting corrosion resistance of aisi 4145 steel subjected to massive laser shock peening treatment with different coverage layers
    Optics and Laser Technology, 2017
    Co-Authors: Bingyuan Han, C.y. Cui, K.y. Luo
    Abstract:

    Abstract The effects of massive laser shock peening (LSP) treatment with different coverage layers on residual stress, pitting morphologies in a standard corrosive solution and electrochemical corrosion resistance of AISI 4145 steel were investigated by pitting corrosion Test, Potentiodynamic Polarisation Test, and SEM observations. Results showed massive LSP treatment can effectively cause an obvious improvement of pitting corrosion resistance of AISI 4145 steel, and increased coverage layer can also gradually improve its corrosion resistance. Massive LSP treatment with multiple layers was shown to influence pitting corrosion behaviour in a standard corrosive solution.

Xiaonong Cheng - One of the best experts on this subject based on the ideXlab platform.

  • corrosion behaviour of aisi 304 stainless steel subjected to massive laser shock peening impacts with different pulse energies
    Corrosion Science, 2014
    Co-Authors: K.y. Luo, M Luo, Xiaonong Cheng
    Abstract:

    Abstract Effects of massive laser shock peening (LSP) impacts with different pulse energies on ultimate tensile strength (UTS), stress corrosion cracking (SCC) susceptibility, fracture appearance and electrochemical corrosion resistance of AISI 304 stainless steel were investigated by slow strain rate Test, Potentiodynamic Polarisation Test and scanning electron microscope observation. The influence mechanism of massive LSP impacts with different pulse energies on corrosion behaviour was also determined. Results showed that massive LSP impacts effectively caused a significant improvement on UTS, SCC resistance, and electrochemical corrosion resistance of AISI 304 stainless steel. Increased pulse energy can also gradually improve its corrosion resistance.

Yong Huang - One of the best experts on this subject based on the ideXlab platform.

  • osteoblastic cell responses and antibacterial efficacy of cu zn co substituted hydroxyapatite coatings on pure titanium using electrodeposition method
    RSC Advances, 2015
    Co-Authors: Yong Huang, Xuejiao Zhang, Ranlin Zhao, Huanhuan Mao, Yajing Yan, Xiaofeng Pang
    Abstract:

    Effective physiological bone integration and absence of bacterial infection are essential for a successful orthopaedic or dental implant. This work elucidated the antibacterial efficacy and cytocompatibility of an electroplated Cu(II) and Zn(II) co-substituted hydroxyapatite (HAP) (i.e., ZnCuHAP) coating on commercially pure titanium (Ti-cp). To improve the antibacterial property of pure HAP, Cu2+ was substituted into its structure. Simultaneously, Zn2+ is co-substituted as a secondary material into CuHAP to offset the potential cytotoxicity of Cu, because an elevated Cu concentration is toxic. The as-deposited coatings were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Co-doping of Zn2+ and Cu2+ into HAP reduced the porosity, resulting in a denser coating. The Zn2+ and Cu2+ ions were homogenously co-deposited into HAP films. Potentiodynamic Polarisation Test revealed that the ZnCuHAP covered coating provided good barrier characteristics and achieved superior corrosion protection for Ti substrates. The as-prepared ZnCuHAP coating was found to be highly effective against Escherichia coli in vitro. In vitro biocompatibility Tests and MTT were employed to assess the cytotoxicity of ZnCuHAP coating with osteoblast-like MC3T3-E1 cells. No adverse effect or cytotoxicity on osteoblasts by Zn/Cu addition was observed, revealing that the co-substitution of Zn in CuHAP efficiently offsets the adverse effects of Cu and improves the performance compared with that of pure HAP.

  • Antibacterial efficacy, corrosion resistance, and cytotoxicity studies of copper-substituted carbonated hydroxyapatite coating on titanium substrate
    Journal of Materials Science, 2014
    Co-Authors: Yong Huang, Xuejiao Zhang, Ranlin Zhao, Huanhuan Mao, Yajing Yan, Xiaofeng Pang
    Abstract:

    This work elucidated the antibacterial efficacy, corrosion resistance, and cytotoxicity of electroplated copper-substituted hydroxyapatite (CuHAP) coating on titanium (Ti). The fabricated CuHAP coatings were characterized by scanning electron microscopy, energy-dispersive X-ray analysis spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction studies. The CuHAP coating had needle-like apatite crystals, the doping of Cu2+ into HAP reduced porosity, and the coating became denser. The CuHAP crystals were carbonated with a few of Cu2+ incorporation (about 0.80 wt%). The Cu2+ ions were homogenously deposited into HAP films. Potentiodynamic Polarisation Test revealed that the CuHAP coating provided good barrier characteristics and achieved superior corrosion protection for Ti substrates. The in vitro antibacterial activity of as-prepared CuHAP coating was evaluated against Escherichia coli and was found to be effectively high against bacterial colonization. Bioactivity Test conducted by soaking the coatings in simulated body fluid demonstrated that CuHAP coating can quickly induce bone-like apatite nucleation and growth. In vitro biocompatibility Tests, MTT, were employed to assess the cytotoxicity of CuHAP coating with osteoblast-like MC3T3-E1 cells. The obtained HAP coating doped with a low content of Cu2+ exhibited good cytocompatibility and had no toxicity toward MC3T3-E1.

  • In vitro cytocompatibility and corrosion resistance of zinc-doped hydroxyapatite coatings on a titanium substrate
    Journal of Materials Science, 2014
    Co-Authors: Qiongqiong Ding, Yong Huang, Xuejiao Zhang, Yajing Yan, Xiaofeng Pang
    Abstract:

    To improve biocompatibility and corrosion resistance during the initial implantation stage, zinc-substituted hydroxyapatite (ZnHAp) coating was fabricated on pure titanium by the electrolytic deposition method. The morphology, microstructure and chemical composition of the coating were investigated by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis and Fourier transform infrared spectroscopy. The prepared ZnHAp crystals were calcium deficient and were carbonated owing to the incorporation of some Zn2+. This incorporation of Zn2+ into the HAp significantly reduced porosity and caused the coating to become noticeably denser. In addition, the Zn2+ ions were homogeneously distributed in the coating. The Potentiodynamic Polarisation Test revealed that the ZnHAp-coated surface showed superior corrosion resistance over that of the HAp-coated surface and bare Ti. The in vitro bioactivity was evaluated in a simulated body fluid, which revealed that the ZnHAp coating can rapidly induce bone-like apatite formation of nuclear and growth features. In addition, the cell response Tests showed that the MC3T3-E1 cells on the ZnHAp coating clearly enhanced the in vitro cytocompatibility of Ti compared with the same cells on HAp coating. ZnHAp coating was thus beneficial for improving biocompatibility.

  • Characterisation, corrosion resistance and in vitro bioactivity of manganese-doped hydroxyapatite films electrodeposited on titanium
    Journal of materials science. Materials in medicine, 2013
    Co-Authors: Yong Huang, Yajing Yan, Qiongqiong Ding, Shuguang Han, Xiaofeng Pang
    Abstract:

    This work elucidated the corrosion resistance and in vitro bioactivity of electroplated manganese-doped hydroxyapatite (MnHAp) film on NaOH-treated titanium (Ti). The NaOH treatment process was performed on Ti surface to enhance the adhesion of the MnHAp coating on Ti. Scanning electron microscopy images showed that the MnHAp coating had needle-like apatite crystals, and the approximately 10 μm thick layer was denser than HAp. Energy-dispersive X-ray spectroscopy analysis revealed that the MnHAp crystals were Ca-deficient and the Mn/P molar ratio was 0.048. X-ray diffraction confirmed the presence of single-phase MnHAp, which was aligned vertically to the substrate. Fourier transform infrared spectroscopy indicated the presence of phosphate bands ranging from 500 to 650 and 900 to 1,100 cm−1, and a hydroxyl band at 3,571 cm−1, which was characteristic of HAp. Bond strength Test revealed that adhesion for the MnHAp coating was more enhanced than that of the HAp coating. Potentiodynamic Polarisation Test showed that the MnHAp-coated surface exhibited superior corrosion resistance over the HAp single-coated surface. Bioactivity Test conducted by immersing the coatings in simulated body fluid showed that MnHAp coating can rapidly induce bone-like apatite nucleation and growth. Osteoblast cellular Tests revealed that the MnHAp coating was better at improving the in vitro biocompatibility of Ti than the HAp coating.