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.

Formation and Phase Transition of Crystalline Calcium Phosphate on Bioabsorbable Magnesium Alloy under Alkali Condition

2019 ◽  
Vol 829 ◽  
pp. 3-8
Author(s):  
Shin Watanabe ◽  
Takeshi Yabutsuka ◽  
Shigeomi Takai
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Calcium Phosphate ◽  
Octacalcium Phosphate ◽  
Moderate Temperature ◽  
Alkali Solution ◽  
Mg Alloy ◽  
Significant Change

In order to improve the corrosion resistance, bioabsorbable magnesium (Mg) alloy was immersed in an aqueous solution with three times of Ca2+ and HPO42- in comparison with those of conventional SBF at the moderate temperature. After immersion in the solution, the whole surface of Mg alloy was coated with plate-like crystals consisting of octacalcium phosphate (OCP). Then the OCP-coated Mg alloy was immersed in the alkali solution. Although significant change of morphology was not observed, the OCP formed on the Mg alloy was transformed to hydroxyapatite (HAp) under alkali condition.

Composite Calcium Phosphate Coatings on Mg Alloy for Medicine

2015 ◽  
Vol 245 ◽  
pp. 159-165 ◽  
Author(s):  
Sergey V. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Artyom М. Puz' ◽  
Dmitry V. Mashtalyar ◽  
Natalya G. Plekhova
Keyword(s):  
Calcium Phosphate ◽  
Biologically Active ◽  
Mg Alloy ◽  
High Tech ◽  
Calcium Phosphate Coating ◽  
Phosphate Coatings ◽  
Calcium Phosphate Layer ◽  
Plasma Electrolytic ◽  
Calcium Phosphate Coatings

The high-tech method of creating anticorrosion calcium phosphate coating on the magnesium alloy MA8 (MgMnCe) has been developed. As was demonstrated by the volumetry method the sealing of the layer formed on the surface of Mg alloy using plasma electrolytic oxidation by superdispersed polytetrafluoroethylene substantially reduced the rate of the corrosion process. Here, the surface of the calcium phosphate layer containing hydroxyapatite (Ca/P = 1.61) remains biologically active. Studies of architectonics of the surface of innate immune cells have been performed in vitro.

Fabrication of Porous Titania and Porous Calcium Phosphate Coatings on Titanium Surface

2007 ◽  
Vol 330-332 ◽  
pp. 529-532 ◽  
Author(s):  
Bo Feng ◽  
Jie Weng ◽  
Yu Liang ◽  
Shu Xin Qu ◽  
Jin Wang ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Porous Layer ◽  
Titanium Surface ◽  
Octacalcium Phosphate ◽  
Acid Etching ◽  
Phosphate Coatings ◽  
Porous Titania ◽  
Biological Environment ◽  
Calcium Phosphate Coatings

A network-like porous layer on titanium was prepared by acid-etching with a mixture of CaCl2 and HCl. The pores ranged from 1 to 10!m. The small pores distributed in big pores. In the simulated biological environment, porous octacalcium phosphate (OCP) coatings spontaneously formed on the porous- surfaced titanium. Pre-calcification after acid-etching accelerated OCP precipitation. The OCP coatings had big pores of about 25!m and small pores of 1~3!m, the latter distributed in the former at different depth.

Corrosion resistance of biomimetic calcium phosphate coatings on magnesium due to varying pretreatment time

2011 ◽  
Vol 176 (20) ◽  
pp. 1756-1760 ◽  
Author(s):  
J. Waterman ◽  
A. Pietak ◽  
N. Birbilis ◽  
T. Woodfield ◽  
G. Dias ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Calcium Phosphate ◽  
Phosphate Coatings ◽  
Pretreatment Time ◽  
Calcium Phosphate Coatings
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