scholarly journals Facile Synthesis of Excellent Anti-Corrosive Bi-Layer Structure Composite Coatings On Mg Alloys

2019 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Layer Structure ◽  
Composite Coatings ◽  
Mg Alloys ◽  
Facile Synthesis

scholarly journals Layer-by-Layer Self-Assembly Composite Coatings for Improved Corrosion and Wear Resistance of Mg Alloy for Biomedical Applications

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 515
Author(s):  
Tongfang Liu ◽  
Song Rui ◽  
Sheng Li
Keyword(s):  
Wear Resistance ◽  
Self Assembly ◽  
Biomedical Applications ◽  
Composite Coatings ◽  
Covalent Bond ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Layer By Layer ◽  
Corrosion Propagation ◽  
Chemical Linkage

Mg alloys are promising biomedical metal due to their natural degradability, good processability, and favorable mechanical properties. However, the poor corrosion resistance limits their further clinical applications. In this study, the combined strategies of surface chemical treatment and layer-by-layer self-assembly were used to prepare composite coatings on Mg alloys to improve the biocorrosion resistance. Specially, alkalized AZ91 Mg alloy generated chemical linkage with silane via Si–O–Mg covalent bond at the interface. Subsequently, Si–OH group from silane formed a crosslinked silane layer by Si–O–Si network. Further chemical assembly with graphene oxide (GO), lengthened the diffusion pathway of corrosive medium. The chemically assembled composite coatings could firmly bond to Mg alloy substrate, which persistently and effectively acted as compact barriers against corrosion propagation. Improved biocorrosion resistance of AZ91 Mg alloy with self-assembly composite coatings of silane/GO was subsequently confirmed by immersion tests. Besides, the Mg alloy exhibited good wear resistance due to outside layer of GO with a lubricant effect. Cell viability of higher than 75% had also been found for the alloy with self-assembly composite coatings, which showed good cytocompatibility.

scholarly journals Corrosion and biocompatibility behaviours of microarc oxidation/phytic acid coated magnesium alloy clips for use in cholecystectomy in a rabbit model

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 20730-20736
Author(s):  
Qiuxia Zheng ◽  
Zongbin Sun ◽  
Zhanhui Wang ◽  
Tinghe Duan ◽  
Kai Xu ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Phytic Acid ◽  
Cystic Duct ◽  
Composite Coatings ◽  
Rabbit Model ◽  
Microarc Oxidation ◽  
Cystic Artery ◽  
Mg Alloys

Mg alloys with microarc oxidation/phytic acid composite coatings were tested as degradable ligation clips for ligating the cystic duct and cystic artery.

Anticorrosion composite coatings on biodegradable Mg alloys: Electrochemical studies

2016 ◽  
Vol 61 (2) ◽  
pp. 135-141 ◽  
Author(s):  
S. V. Gnedenkov ◽  
S. L. Sinebryukhov ◽  
A. V. Puz’ ◽  
D. V. Mashtalyar ◽  
A. G. Zavidnaya ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Mg Alloys ◽  
Electrochemical Studies

Layer by layer assembled chitosan (TiO2)-heparin composite coatings on MAO-coated Mg alloys

2020 ◽  
Vol 281 ◽  
pp. 128640
Author(s):  
Yang Chen ◽  
Jing Wang ◽  
Jinhe Dou ◽  
Huijun Yu ◽  
Chuanzhong Chen
Keyword(s):  
Composite Coatings ◽  
Mg Alloys ◽  
Layer By Layer

Facile synthesis and characterization of Poly (3, 4-ethylenedioxythiophene)/Molybdenum disulfide (PEDOT/MoS2) composite coatings for potential neural electrode applications

2020 ◽  
Vol 50 (9) ◽  
pp. 943-958
Author(s):  
D. V. Santhosh Kumar Gunapu ◽  
V. Sushma Mudigunda ◽  
Aparajitha Das ◽  
Aravind Kumar Rengan ◽  
Siva Rama Krishna Vanjari
Keyword(s):  
Molybdenum Disulfide ◽  
Composite Coatings ◽  
Synthesis And Characterization ◽  
Facile Synthesis ◽  
Neural Electrode

Backscattered Electron Imaging of GaAs/AlGaAs Super Lattice Structures with an Ultra-High- Resolution SEM

1988 ◽  
Vol 46 ◽  
pp. 204-205
Author(s):  
Kazumichi Ogura ◽  
Michael M. Kersker
Keyword(s):  
High Resolution ◽  
Layer Structure ◽  
High Sensitivity ◽  
Beam Current ◽  
Electron Beam Current ◽  
Lattice Structures ◽  
Super Lattice ◽  
Different Types ◽  
Backscattered Electron ◽  
Electron Imaging

Backscattered electron (BE) images of GaAs/AlGaAs super lattice structures were observed with an ultra high resolution (UHR) SEM JSM-890 with an ultra high sensitivity BE detector. Three different types of super lattice structures of GaAs/AlGaAs were examined. Each GaAs/AlGaAs wafer was cleaved by a razor after it was heated for approximately 1 minute and its crosssectional plane was observed.First, a multi-layer structure of GaAs (100nm)/AlGaAs (lOOnm) where A1 content was successively changed from 0.4 to 0.03 was observed. Figures 1 (a) and (b) are BE images taken at an accelerating voltage of 15kV with an electron beam current of 20pA. Figure 1 (c) is a sketch of this multi-layer structure corresponding to the BE images. The various layers are clearly observed. The differences in A1 content between A1 0.35 Ga 0.65 As, A1 0.4 Ga 0.6 As, and A1 0.31 Ga 0.69 As were clearly observed in the contrast of the BE image.

Generation of 4H and 6H Structures During the Hexagonal-Rhombohedral Transformation in Dy2Co17

1975 ◽  
Vol 33 ◽  
pp. 38-39
Author(s):  
C. W. Allen ◽  
D. L. Kuruzar
Keyword(s):  
Elevated Temperatures ◽  
Layer Structure ◽  
Transition Element ◽  
Temperature Structure ◽  
Allotropic Transformation ◽  
Layer Plane ◽  
Planar Defects ◽  
Topologically Close Packed ◽  
Transformation Mechanisms ◽  
Shear Transformation

The rare earth/transition element intermetallics R2T17 are essentially topologically close packed phases for which layer structure models have already been presented. Many of these compounds are known to undergo allotropic transformation of the type at elevated temperatures. It is not unexpected that shear transformation mechanisms are involved in view of the layering character of the structures. The transformations are evidently quite sluggish, illustrated in furnace cooled Dy2Co17 by the fact that only rarely has the low temperature rhombohedral form been seen. The more usual structures observed so far in furnace cooled alloys include 4H and 6H in Dy2Co17 (Figs. 1 and 2) . In any event it is quite clear that the general microstructure is very complicated as a consequence of the allotropy, illustrated in Fig. 3. Numerous planar defects in the layer plane orientation are evident as are non-layer plane defects inherited from a high temperature structure.

Electron-Probe Quantitative Energy-Dispersive Analysis of Trace Magnesium Concentrations in Ag-Mg Alloys

1996 ◽  
Vol 54 ◽  
pp. 510-511
Author(s):  
R. B. Marinenko
Keyword(s):  
Electron Probe ◽  
Energy Dispersive Spectrometry ◽  
Mg Alloys ◽  
Energy Dispersive ◽  
Energy Dispersive Analysis ◽  
High Tc ◽  
Alloy Wire ◽  
High Tc Superconductor ◽  
Eds Analysis ◽  
Superior Mechanical Properties

Internally oxidized Ag-Mg alloys are used as sheaths for high Tc superconductor wires because of their superior mechanical properties. The preparation and characteristics of these materials have been reported. Performance of the sheaths depends on the concentration of the magnesium which generally is less than 0.5 wt. percent. The purpose of this work was to determine whether electron probe microanalysis using energy dispersive spectrometry (EDS) could be used to quantitate three different Ag-Mg alloys. Quantitative EDS analysis can be difficult because the AgL escape peak occurs at the same energy (1.25 keV) as the Mg Kα peak. An EDS spectrum of a Ag-Mg alloy wire is compared to a pure Ag spectrum in Fig. 1.

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