Structural-Morphological and Adhesive Properties of Calcium-Phosphate Coatings Formed on a Magnesium Alloy by Microarc Oxidation in an Electrolyte Containing Disperse Particles

2021 ◽  
Author(s):  
M. B. Sedelnikova ◽  
A. V. Ugodchikova ◽  
P. V. Uvarkin ◽  
V. V. Chebodaeva ◽  
T. V. Tolkacheva ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Microarc Oxidation ◽  
Adhesive Properties ◽  
Disperse Particles ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

Effect of Crystalline Calcium Phosphate Coatings Prepared in an Aqueous Solution on Corrosion Resistance of Bioabsorbable Magnesium Alloy

2018 ◽  
Vol 782 ◽  
pp. 158-164
Author(s):  
Shin Watanabe ◽  
Takeshi Yabutsuka ◽  
Shigeomi Takai
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Mg Alloy ◽  
High Corrosion Resistance ◽  
Phosphate Coatings ◽  
Naoh Solution ◽  
Biological Environment ◽  
Calcium Phosphate Coatings

Bioabsorbable magnesium (Mg) alloy was anodized in 1.0 M NaOH solution. Then the anodized Mg alloy was immersed in an aqueous solution with three times concentration of Ca2+and HPO42-in comparison with those of biological environment to improve its corrosion resistance. The whole surface of Mg alloy was successfully coated with crystalline calcium phosphate (CaP) within 1 day. The CaP coated Mg alloys showed high corrosion resistance in SBF.

Biomimetic Crystalline Calcium Phosphate Coatings on Bioabsorbable Magnesium Alloy

2017 ◽  
Vol 758 ◽  
pp. 81-85 ◽  
Author(s):  
Shin Watanabe ◽  
Takeshi Yabutsuka ◽  
Shigeomi Takai
Keyword(s):  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Apatite Layer ◽  
Mg Alloy ◽  
Phosphate Coatings ◽  
Naoh Solution ◽  
Calcium Phosphate Coatings

Bioabsorbable magnesium (Mg) alloy was anodized in 1.0 M NaOH solution to improve the corrosion resistance. Then the anodized Mg alloy was immersed in an aqueous solution with three times of Ca2+ and HPO42- and lower Na+ and Cl- in comparison with those of conventional SBF. The whole surface of Mg alloy was successfully coated with plate-like apatite within 1 day. The thickness of apatite layer formed on Mg alloy was about 7 μm.

Lanthanum- and silicon-incorporated calcium phosphate coatings formed by microarc oxidation

2017 ◽  
Author(s):  
E. G. Komarova ◽  
M. B. Sedelnikova ◽  
Y. P. Sharkeev ◽  
M. V. Chaikina ◽  
E. A. Kazanceva
Keyword(s):  
Calcium Phosphate ◽  
Microarc Oxidation ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

Effect of boehmite nanoparticles on the structural, corrosion and diffusion properties of microarc biocoatings

2020 ◽  
pp. 19-30
Author(s):  
V.V. Chebodaeva ◽  
◽  
N.N. Nazarenko ◽  
M.B. Sedelnikova ◽  
S.B. Gnedenkov ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Biological Fluid ◽  
Effective Diffusion ◽  
Microarc Oxidation ◽  
Surface Layers ◽  
Phosphate Coatings ◽  
Boehmite Nanoparticles ◽  
Calcium Phosphate Coatings ◽  
And Diffusion ◽  
Diffusion Properties

The results of the morphology, porous structure, the corrosion and diffusion properties study of boehmite-containing calcium phosphate coatings formed by microarc oxidation on titanium substrates are presented. Boehmite nanoparticles obtained as a result of AlN hydrolysis were deposited on the surface of microarc coatings with a developed relief. With an increase in the duration of preliminary ultrasonic treatment (UST) of a suspension with AlN in the range of 20-60 min, the size of agglomerates of boehmite nanoparticles on the coating surface decreases from 200 to 40 μm. The surface porosity of the modified coatings and the area occupied by boehmite particles decrease from 36 to 33% and from 27 to 10% respectively. Agglomerates with boehmite nanoparticles after 60 min of UST of suspensions with AlN powder are distributed more uniformly in the coating than after 20 min of treatment. With an increase in the UST duration of the initial suspensions, the effective diffusion coefficients of the model biological fluid in porous coatings decrease from 7.98·10–11 to 7.25·10–11 m2/s. Modification of calcium phosphate coatings with boehmite nanoparticles with varying the duration of the UST of AlN powder increases the corrosion resistance of the surface layers.

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