Microstructure of hydroxyapatite- and octacalcium phosphate-coatings formed on magnesium by a hydrothermal treatment at various pH values

Tomozawa, Masanari; Hiromoto, Sachiko

doi:10.1016/j.actamat.2010.09.041

Cited by 148 publications

(83 citation statements)

References 30 publications

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“…The HAp coating, thus, grew with an increase of the treatment period. The peaks at 25.9 and 53.0 degrees, which are respectively originated from (002) and (004) 19) This fact suggests that the preferential growth direction of the HAp crystal plane does not depend on the texture of the substrate. Figure 2 shows the appearance of the chem-polished, 4 hand 6 h-treated specimens.…”

Section: Morphology Of the Coatingsmentioning

confidence: 70%

“…We proved that HAp-coated pure Mg and a AZ31 alloy show high corrosion resistance in a 3.5 mass% NaCl solution. 19) Here, the HAp coating almost retained its original morphology after 7 days of immersion. Yang et al also reported that AZ31 coated with HAp by an ion-beam technique showed high corrosion resistance in a 3 mass% NaCl solution.…”

Section: )mentioning

confidence: 88%

“…3(b)] shows that the HAp coating consisted of an inner continuous layer and an outer porous layer similar to those formed on the extruded AZ31 and pure Mg. 19,20) The outer layer was composed of rod-like crystals growing in a radial direction from each dome. The good adhesiveness of phosphate coatings to organic paints depends on the microporous structure of the coating.…”

Section: Morphology Of the Coatingsmentioning

confidence: 99%

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Corrosion of Calcium Phosphate Coated AZ31 Magnesium Alloy under a Salt Spray Test

Hiromoto

2012

Mater. Trans.

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The corrosion resistance and adhesiveness of a hydroxyapatite (HAp)-coated AZ31 magnesium alloy rolled plate were evaluated by a salt spray test (SST: JIS Z 2371) and a cross-cut test (CCT: JIS K 5600), respectively. The length of the HAp coating solution treatment was 4 or 6 h. A HAp coating consisting of an inner continuous layer and an outer porous layer uniformly covered the surface regardless of the treatment period. After the SST for 7 days, the HAp-coated surfaces showed no significant delamination but several visible pits. The HAp coating in the non-corroded area retained its original morphology after the SST by a SEM observation. The rating number (RN) for the HAp-coated specimens was over 9, which was much higher than RN 4 observed for the chemically polished specimen covered almost entirely with filiform corrosion. The RN of HAp-coated specimen increased slightly with a longer treatment period. The adhesiveness of the HAp coating was not influenced by the SST according to the CCT. After removing the corrosion products and HAp coating from the non-corroded area, small pits with a diameter of a few hundred micrometers appeared; however, general corrosion did not take place underneath the HAp coating. The HAp coating shows high corrosion resistance and good adhesiveness to the AZ31 substrate.

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Section: Morphology Of the Coatingsmentioning

confidence: 70%

Section: )mentioning

confidence: 88%

Section: Morphology Of the Coatingsmentioning

confidence: 99%

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Corrosion of Calcium Phosphate Coated AZ31 Magnesium Alloy under a Salt Spray Test

Hiromoto

2012

Mater. Trans.

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“…However, overly small particles are unsuitable because pigments might enter pores in the skin. Hydrothermal processes are generally used to control the powder properties of inorganic phosphate materials [9][10][11]. The functional materials are obtained from high temperature aqueous solution at high vapor pressure.…”

Section: Introductionmentioning

confidence: 99%

pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

Onoda

Yamaguchi

2014

J Adv Ceram

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Titanium phosphates were prepared from titanium chloride and sodium pyrophosphate at various pH in hydrothermal process as a novel white pigment for cosmetics. Their chemical composition, powder properties, photo catalytic activity, colour phase and smoothness were studied. The obtained materials had a higher Ti/P ratio than that used in preparation conditions because of the formation of titanium oxide and hydroxide. The samples prepared at pH = 4 had particles smaller than 100 µm. Titanium phosphates had less photo catalytic activity to protect the sebum on the skin. The obtained materials in hydrothermal process and their thermal products at 100 ℃ showed high reflectance in the range of visible light.

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“…We have employed chemical solution deposition for forming HAp on HNS at temperatures below 100 • C [34,35]. We have also established a simple chemical solution deposition method using aqueous solutions of various pH at 90 • C for uniformly depositing highly crystalline HAp-coatings on pure magnesium (Mg) and Mg alloys [36][37][38][39][40][41]. The corrosion of the surface, where Mg ions were eluted, initiated the rapid nucleation of HAp in aqueous solution [40,41].…”

Section: Introductionmentioning

confidence: 99%

Preparation and biological evaluation of hydroxyapatite-coated nickel-free high-nitrogen stainless steel

Sasaki

Inoue

Katada

et al. 2012

Science and Technology of Advanced Materials

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Calcium phosphate was formed on nickel-free high-nitrogen stainless steel (HNS) by chemical solution deposition. The calcium phosphate deposition was enhanced by glutamic acid covalently immobilized on the surface of HNS with trisuccinimidyl citrate as a linker. X-ray diffraction patterns and Fourier transform infrared spectra showed that the material deposited on glutamic acid-immobilized HNS within 24 h was low-crystallinity calcium-deficient carbonate-containing hydroxyapatite (HAp). The biological activity of the resulting HAp-coated HNS was investigated by using a human osteoblast-like MG-63 cell culture. The HAp-coated HNS stimulated the alkaline-phosphate activity of the MG-63 culture after 7 days. Therefore, HAp-coated HNS is suitable for orthopedic devices and soft tissue adhesion materials.

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Microstructure of hydroxyapatite- and octacalcium phosphate-coatings formed on magnesium by a hydrothermal treatment at various pH values

Cited by 148 publications

References 30 publications

Corrosion of Calcium Phosphate Coated AZ31 Magnesium Alloy under a Salt Spray Test

Corrosion of Calcium Phosphate Coated AZ31 Magnesium Alloy under a Salt Spray Test

pH-controlled hydrothermal synthesis of titanium phosphates and their powder properties

Preparation and biological evaluation of hydroxyapatite-coated nickel-free high-nitrogen stainless steel

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