Surface Modification of Magnesium by NaHCO&lt;SUB&gt;3&lt;/SUB&gt; and Corrosion Behavior in Hank&amp;rsquo;s solution for New Biomaterial Applications

Al-Abdullat, Yousef; Tsutsumi, Sadami; Nakajima, N.; Ohta, Makoto; Kuwahara, H.; Ikeuchi, Ken

doi:10.2320/matertrans.42.1777

Cited by 89 publications

(45 citation statements)

References 10 publications

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“…It has been shown that magnesium apatite precipitates on the surface of the modified pure Mg [8,9] and osteoblasts respond by degrading magnesium alloys in the guinea pig femur [10]. Magnesium alloys have also shown osteoconductive and osteoinductive properties, thus offering a less invasive repair and temporary support during tissue recovery.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

et al. 2010

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The comparative study of the corrosion behaviour of the AZ31 magnesium alloy with different grain sizes immersed in simulated body fluids was made in chloride solutions (8g/L) and Phosphate Buffer-containing Solution (PBS). The influence of the immersion time was also analysed. Electrochemical techniques such as the open circuit potential, polarization curves, current transients and electrochemical impedance spectroscopy, complemented with scanning electron microscopy and energy dispersive spectroscopy were used. Immediately after the immersion in the corrosive media the corrosion resistance was similar for both grain sizes of the AZ31 alloy and higher in 2 NaCl solutions than in PBS. However, this corrosion behaviour was reversed after longer periods of immersion due to the stabilizing of the corrosion products of MgO and/or Mg(OH) 2 with P-containing compounds. These P-compounds contribute to a higher level of protection by hindering the aggressive action of chloride ions. The best corrosion behaviour of the AZ31 alloy was obtained for the finest grain alloy associated with the highest transfer resistance value, after long periods of immersion in PBS.

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Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

et al. 2010

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“…[9][10][11][12][13][14][15][16][17][18][19] Especially, coatings with hydroxyapatite (HAp) and its related calcium phosphate compounds attract attention [11][12][13][14][15][16][17][18][19] because HAp is an essential element of bone and the calcium phosphate compounds precipitated from simulated body fluids improved the corrosion resistance of magnesium. 9,[20][21][22] A single-step process using aqueous solutions consisting of non-toxic compounds is desirable for the formation of HAp coating from the viewpoint of biocompatibility, production cost and environmental load. However, direct formation of well-crystallized HAp on the surface of magnesium and its alloys in aqueous solutions is thermodynamically difficult.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Magnesium with Hydroxyapatite Coatings Formed by Hydrothermal Treatment

Hiromoto

Tomozawa

2010

Mater. Trans.

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Corrosion resistance of magnesium alloys must be improved for their applications to orthopaedic bioabsorbable devices. Since hydroxyapatite (HAp) is chemically stable in the body and is the main component of bones, HAp coatings have been well studied to improve the corrosion resistance and osteoconductivity of magnesium alloys. In this study, highly crystallized HAp coatings were formed on pure magnesium with a single-step hydrothermal treatment using a C 10 H 12 CaN 2 Na 2 O 8 solution with various pH values. Morphology of the HAp coating varied depending on the pH value. Corrosion behavior of the HAp-coated magnesium was investigated by anodic polarization, impedance and immersion tests in a simulated body fluid. It was revealed that the corrosion resistance of pure magnesium was improved more than 10 times with the HAp coatings. Stable localized corrosion was prevented with the HAp coatings although the occurrence and moderation of unstable localized corrosion appeared to take place at the defects of the HAp coatings. The initial protectiveness of the HAp coating depended on the treatment condition. During 4-day immersion, the precipitated HAp sealed the defects of the HAp coatings, resulting in the negligible release of magnesium ions regardless of the treatment conditions.

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“…El magnesio y sus aleaciones son materiales biodegradables potenciales debido a su atractivo comportamiento biológi-co [1] : 1) el magnesio se degrada en los fluidos corporales por corrosión; 2) el magnesio no es tóxico y su exceso puede fácilmente ser excretado en la orina; 3) el magnesio puede estimular el crecimiento de nuevo tejido en el hueso, haciéndolo particularmente apropiado para aplicaciones ortopédicas; 4) la densidad, módulo elástico y resistencia a la compresión del magnesio son más cercanos a aquellos del hueso que la de los materiales metálicos convencionales empleados en aplicaciones endoprotésicas. Además, el magnesio es necesario para la incorporación del calcio al hueso [2] . Debido a estas características, el magnesio y sus aleaciones son potencialmente superiores a cualesquiera otros implantes, metálicos o poliméricos, en reparaciones óseas.…”

Section: Introductionunclassified

“…Para mejorar la resistencia a la corrosión del magnesio y sus aleaciones se han propuesto diferentes alternativas, entre las que cabe destacar los tratamientos de modificación superficial, que incluyen recubrimientos de conversión química [2][3][4][5][6][7][8] , anodizado [9] , electrodepósito de hidroxiapatita [1] , entre otros. Los tratamientos para generar recubrimientos de conversión química son conocidos por su bajo coste y simplicidad de operación.…”

Section: Introductionunclassified

Tratamientos químicos de conversión para la protección de magnesio biodegradable en aplicaciones temporales de reparación ósea

Carboneras¹,

Hernández-Alvarado²,

Mireles³

et al. 2010

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ResumenEl presente estudio se desarrolló para mejorar la resistencia a la corrosión del magnesio puro, modificando su superficie mediante recubrimientos de conversión química. Se generaron capas de carbonato y fluoruro por inmersión en soluciones de NaHCO 3 al 9 % y de HF al 48 %, respectivamente. La resistencia a la corrosión de las muestras con recubrimiento se evaluó en comparación con la del sustrato desnudo mediante técnicas electroquímicas en una solución fisiológica (PBS). Los resultados obtenidos han mostrado que el recubrimiento de carbonato no es capaz de proteger de la degradación al sustrato de magnesio. Por el contrario, el recubrimiento de fluoruro ha demostrado aumentar, significativamente, la resistencia a la corrosión del magnesio en medio fisiológico. La alta compacidad y adherencia al sustrato metálico de la capa de MgF 2 generada mediante este sencillo tratamiento de conversión química confieren al recubrimiento buenas propiedades protectoras. Palabras claveMagnesio; Corrosión; Conversión química; Biomateriales. Chemical conversion treatments to protect biodegradable magnesium in applications as temporary implants for bone repair AbstractThe present study was developed to improve the corrosion resistance of pure magnesium by applying chemical conversion coatings. Carbonate and fluoride layers were generated by immersion in solutions of NaHCO 3 of concentration 9 wt.% and HF of concentration 48 wt.%, respectively. Corrosion resistance of the coated samples was evaluated in comparison with that of the uncoated substrate by electrochemical techniques in a physiological solution (PBS). Results have shown that the carbonate coating is not viable to be used for protecting magnesium against corrosion. On the contrary, the fluoride magnesium coating significantly increases the corrosion resistance of magnesium in physiological medium. The high compactness and adherence to the base metal of the MgF 2 layer produced by this simple chemical conversion treatment confer the protective properties to the coating. KeywordsMagnesium; Corrosion; Chemical conversion; Biomaterials. INTRODUCCIÓNLos materiales para implantes metálicos convencionales, como aceros inoxidables y aleaciones base titanio, tienen un papel importante en la reparación del tejido del hueso dañado. Si estos implantes permanecen en el organismo por largo tiempo siempre liberan cationes metálicos que pueden dañar la salud. Este problema puede resolverse utilizando implantes biodegradables. Los implantes biodegradables pueden disolverse gradualmente, absorberse o excretarse después de que el hueso se ha reparado. El magnesio y sus aleaciones son materiales biodegradables potenciales debido a su atractivo comportamiento biológi-co [1] : 1) el magnesio se degrada en los fluidos corporales por corrosión; 2) el magnesio no es tóxico y su exceso puede fácilmente ser excretado en la orina; 3) el magnesio puede estimular el crecimiento de nuevo tejido en el hueso, haciéndolo particularmente apropiado para aplicaciones ortopédicas; 4) la densidad,

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Surface Modification of Magnesium by NaHCO<SUB>3</SUB> and Corrosion Behavior in Hank’s solution for New Biomaterial Applications

Cited by 89 publications

References 10 publications

Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

Corrosion behaviour of AZ31 magnesium alloy with different grain sizes in simulated biological fluids☆

Corrosion Behavior of Magnesium with Hydroxyapatite Coatings Formed by Hydrothermal Treatment

Tratamientos químicos de conversión para la protección de magnesio biodegradable en aplicaciones temporales de reparación ósea

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