Investigation of electrochemical deposition and properties of composite coatings nickel-chromium-graphite nitrate

2020 ◽  
Vol 28 (3) ◽  
pp. 22-27
Author(s):  
Vitaly N. Tseluikin ◽  
Andrey V. Yakovlev ◽  
Anton S. Mostovoy ◽  
Asel S. Dzhumieva
Keyword(s):  
Electrochemical Deposition ◽  
Composite Coatings ◽  
Nickel Chromium ◽  
Graphite Nitrate

Fabrication of an Apatite/Collagen Composite Coating on the NiTi Shape Memory Alloy through Electrochemical Deposition and Coating Characterisation

2009 ◽  
Vol 618-619 ◽  
pp. 319-323 ◽  
Author(s):  
Parama Chakraborty Banerjee ◽  
Tao Sun ◽  
Jonathan H.W. Wong ◽  
Min Wang
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Coating ◽  
Electrochemical Deposition ◽  
Room Temperature ◽  
Composite Coatings ◽  
Deposition Process ◽  
Niti Shape Memory Alloy ◽  
X Ray ◽  
Niti Sma

To improve the biocompatibility and bioactivity of NiTi shape memory alloy (SMA), apatite/collagen composite coatings were fabricated on the surface of NiTi SMA at room temperature using the electrochemical deposition technique. Spherical apatite particles and fibrous collagen that formed the composite coating were visible under scanning electron microscope (SEM). The Ca/P ratio of the apatite component in the coating, as determined by energy dispersive X-ray spectroscopy (EDX), was about 1.38 which is slightly higher than that of octocalcium phosphate (OCP). X-ray diffraction result showed that the apatite was amorphous, which was due to the low temperature (i.e., room temperature) deposition process. The structure of the composite coatings was further characterized using Fourier transform infrared reflection spectroscopy (FTIR). It was also found that, compared to bare NiTi SMA samples, the wettability of as-deposited samples was increased because of the formation of the composite coating.

scholarly journals FORMATION AND STUDY OF PLASMA SPRAYING DOUBLE-LAYER COMPOSITE COATINGS (VISCOUS METALLIC NiCr AND SOLID ZrO2 LAYER)

2018 ◽  
Vol 17 (1) ◽  
pp. 21-28
Author(s):  
V. A. Okovity ◽  
F. I/ Panteleenko ◽  
V. V. Okovity ◽  
V. M. Astashinsky ◽  
P. P. Hramtsov ◽  
...  
Keyword(s):  
Cross Section ◽  
Composite Coatings ◽  
Average Pore Size ◽  
Average Pore ◽  
Chromium Powder ◽  
Nickel Chromium ◽  
Depth Processing ◽  
Layer Composite ◽  
Lower Porosity ◽  
Sprayed Coating

. The paper presents results pertaining to investigations on influence of plasma jet parameters and fractional composition of initial powder on characteristics of two-layer composite coatings on the basis of nickel-chromium, and zirconium dioxide in the shielding elements. Optimization has been carried out on the basis of obtaining maximum powder use factor. A comparative analysis for dependence of the powder use factor in viscous metal layers of nickel-chrome and nickelaluminum on spraying distance shows that while having similar character of curves for the presented dependencies an absolute value of powder use factor is higher for nickel-chromium powder. It can be explained by a higher ductility of the latter and correspondingly smaller rebound of particles which are colliding with substrate. The investigation results for cross section microstructure in the formed coatings while using scanning electron microscopy are given in the paper. The paper considers cross section microstructures for ZrO2-coating and intermediate Ni–Cr layer. The submitted data reveal that an initial stage of the coating is characterized by porosity and an average pore size is of several micrometers, and in some areas its size reaches 20 mm. The microstructure of a Ni–Cr layer is characterized by lower porosity. Impact of compression plasma flows on sprayed coating leads toformation of fused oxide layer with thickness of 12–15 mm and contributes to smoothing of surface relief and formation of cracks on the surface which are preferably propagating into coating depth. Processing of oxide coatings by compression plasma also results in reduction of their porosity.

Bioactive and Stability of Calcium Phosphate-Polypyrrole Composite Coatings by Electrochemical Deposition

2008 ◽  
Vol 368-372 ◽  
pp. 1198-1200 ◽  
Author(s):  
Mu Qin Li ◽  
Li Jie Qu ◽  
Chen Ma ◽  
Shi Qin Yang
Keyword(s):  
Calcium Phosphate ◽  
Electrochemical Deposition ◽  
Body Fluid ◽  
Composite Coatings ◽  
Therapeutic Agents ◽  
Calcium Phosphate Coating ◽  
Implant Fixation ◽  
The Stability ◽  
Polypyrrole Composite ◽  
Single Coating

This study examined the bioactive and stability of calcium phosphate- polypyrrole(ppy) composite coatings on titanium alloys by electrochemically deposition in simulated body fluid (SBF). Change of coatings mass and SBF pH during coatings soaked in SBF indicated that ppy reduces the decomposition of coatings. The surface morphology of coatings characterized by SEM showed that the stability of composition coating was superior to that of single coating. XRD indicated that ppy induces CO3 2- enter calcium phosphate coating, which showed that the composite coatings possess better bioactive. Thus, this electrochemical deposition provides an effective method of ppy incorporation at physiological temperature, which can offer excellent bioactive and stability of coatings, with a potential for sustained release of therapeutic agents as required for metallic implant fixation.

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