Hydroxyapatite coating of AZ31 magnesium alloy by a solution treatment and its corrosion behavior in NaCl solution

Hiromoto, Sachiko; Tomozawa, Masanari

doi:10.1016/j.surfcoat.2011.04.036

Cited by 106 publications

(63 citation statements)

References 23 publications

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“…The thickness of the inner layer on the 6 h-treated specimen was 25 µm, which is equivalent to 26 µm on the extruded AZ31 treated for the same treatment period. 20) Here, with an increase of the treatment period, HAp peaks on the XRD pattern grew (Fig. 1), and the inner layer grew on the extruded AZ31 with a growth of each dome.…”

Section: Morphology Of the Coatingsmentioning

confidence: 84%

“…The morphology of the defects on the rolled AZ31 was similar to that on the extruded AZ31. 20) It was suggested for the extruded AZ31 that the defects of HAp coating were formed on AlMn enclosures. 20) The rolled AZ31 contains a slight amount of Mn (Table 1), and enclosures with a diameter of a few micrometers were observed on the chemically polished surface, as shown in Fig.…”

Section: Morphology Of the Coatingsmentioning

confidence: 99%

“…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: 84%

Section: Morphology Of the Coatingsmentioning

confidence: 99%

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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“…HA coatings are degradable in physiological environment and show good early interaction between the implant and the tissue [35]. Much research has been done on the fabrication of HA coatings on magnesium and its alloys; preparation methods include electrodeposition [36][37][38], aerosol deposition [39], chemical solution deposition [40], sol-gel method [41], and other processes [42,43]. It should be pointed that the poor bonding strength, corrosion resistance, and inhomogeneity of simplex HA coatings still restrict their application.…”

Section: Introductionmentioning

confidence: 99%

Bio-Corrosion Behavior of Ceramic Coatings Containing Hydroxyapatite on Mg-Zn-Ca Magnesium Alloy

Ding

Wang

et al. 2018

Applied Sciences

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Ceramic coatings containing hydroxyapatite (HA) were fabricated on a biodegradable Mg 66 Zn 29 Ca 5 magnesium alloy through micro-arc oxidation by adding HA particles into the electrolytes. The phase composition and surface morphology of the coatings were characterized by X-ray diffraction and scanning electron microscopy analyses, respectively. Electrochemical experiments and immersion tests were performed in Hank's solution at 37 • C to measure the corrosion resistance of the coatings. Blood compatibility was evaluated by in vitro blood platelet adhesion tests and static water contact angle measurement. The results show that the typical ceramic coatings with a porous structure were prepared on the magnesium alloy surface with the main phases of MgO and MgSiO 3 and a small amount of Mg 3 (PO 4 ) 2 and HA. The optimal surface morphology appeared at HA concentration of 0.4 g/L. The electrochemical experiments and immersion tests reveal a significant improvement in the corrosion resistance of the ceramic coatings containing HA compared with the coatings without HA or bare Mg 66 Zn 29 Ca 5 magnesium alloy. The static water contact angle of the HA-containing ceramic coatings is 18.7 • , which is lower than that of the coatings without HA (40.1 • ). The in vitro blood platelet adhesion tests indicate that the HA-containing ceramic coatings possess improved blood compatibility compared with the coatings without HA. Utilizing HA-containing ceramic coatings may be an effective way to improve the surface biocompatibility and corrosion resistance of magnesium alloys.

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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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Hydroxyapatite coating of AZ31 magnesium alloy by a solution treatment and its corrosion behavior in NaCl solution

Cited by 106 publications

References 23 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

Bio-Corrosion Behavior of Ceramic Coatings Containing Hydroxyapatite on Mg-Zn-Ca Magnesium Alloy

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

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