Corrosion protection of different environmentally friendly coatings on powder metallurgy magnesium

Carboneras, M.; Narváez, L.; Valle, Jorge F. del; García‐Alonso, M. C.; Escudero, M.L.

doi:10.1016/j.jallcom.2010.02.043

Cited by 62 publications

(38 citation statements)

References 45 publications

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“…Conversion coatings are widely studied as corrosion protection for magnesium and its alloys. Fluoride and calcium phosphate-based conversion coatings have a great potential of reducing the corrosion rate of biomedical magnesium implants [1][2][3][4][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Zapletal

Březina

Krystýnová

et al. 2017

Metals

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Magnesium with its mechanical properties and nontoxicity is predetermined as a material for biomedical applications; however, its high reactivity is a limiting factor for its usage. Powder metallurgy is one of the promising methods for the enhancement of material mechanical properties and, due to the introduced plastic deformation, can also have a positive influence on corrosion resistance. Pure magnesium samples were prepared via powder metallurgy. Compacting pressures from 100 MPa to 500 MPa were used for samples' preparation at room temperature and elevated temperatures. The microstructure of the obtained compacts was analyzed in terms of microscopy. The three-point bending test and microhardness testing were adopted to define the compacts' mechanical properties, discussing the results with respect to fractographic analysis. Electrochemical corrosion properties analyzed with electrochemical impedance spectroscopy carried out in HBSS (Hank's Balanced Salt Solution) and enriched HBSS were correlated with the metallographic analysis of the corrosion process. Cold compacted materials were very brittle with low strength (up to 50 MPa) and microhardness (up to 50 HV (load: 0.025 kg)) and degraded rapidly in both solutions. Hot pressed materials yielded much higher strength (up to 250 MPa) and microhardness (up to 65 HV (load: 0.025 kg)), and the electrochemical characteristics were significantly better when compared to the cold compacted samples. Temperatures of 300 • C and 400 • C and high compacting pressures from 300 MPa to 500 MPa had a positive influence on material bonding, mechanical and electrochemical properties. A compacting temperature of 500 • C had a detrimental effect on material compaction when using pressure above 200 MPa.

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Section: Introductionmentioning

confidence: 99%

“…Mechanical properties and corrosion resistance of cold pressed magnesium (310 MPa) and extruded at 420 • C employing an extrusion ratio of 16:1 were studied in [24]. Processed material reached the ultimate tensile strength of 320 MPa, a yield stress of 280 MPa and 2% ductility.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Zapletal

Březina

Krystýnová

et al. 2017

Metals

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“…El material objeto de estudio ha sido la aleación de magnesio AZ31, suministrada por Elektron Limited, UK, en forma de chapa laminada de 3 mm de espesor en la condición "O-temper" consistente en un tratamiento de recocido a 345°C, que equivale a un tratamiento de solubilización por el cual el material de recepción no presenta la fase Mg 17 (Al,Zn) 12 . La composición química del material analizada mediante fluorescencia de rayos X de dispersión por longitud de onda (WDXRF) es la siguiente: 3,37 % Al, 0,78 % Zn, 0,22 % Mn y 95,63 % Mg (porcentajes en peso).…”

Section: Materials Y Modificación Superficialunclassified

“…Además, el magnesio es un elemento necesario para la incorporación del calcio al hueso [4] y para la estimulación del crecimiento de nuevo tejido, no siendo tóxico y degradándose en los fluidos del cuerpo, lo que le hace particularmente apropiado para aplicaciones ortopédicas. No obstante, el magnesio presenta una velocidad de corrosión muy elevada en medio fisiológico, lo que hace necesaria la aplicación de estrategias para controlar su cinética de degradación [5 y 6] , comprendiendo desde la modificación del procesado metalúrgico del material [7] , la variación del tamaño de grano [8] , la adición de elementos aleantes [9 y 10] hasta la aplicación de recubrimientos y tratamientos de modificación superficial [11][12][13] .…”

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Comportamiento frente a la corrosión y biocompatibilidad <i>in vitro/in vivo</i> de la aleación AZ31 modificada superficialmente

et al. 2011

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ResumenEn el presente trabajo se ha estudiado el comportamiento frente a la corrosión y la biocompatibilidad in vitro/in vivo de la aleación de magnesio AZ31, cuyas propiedades mecánicas son superiores a los requisitos mecánicos del hueso. La aleación en estado de recepción ha mostrado una cinética de corrosión no compatible con el crecimiento celular. Para mejorar su comportamiento, el material ha sido modificado superficialmente mediante tratamiento de conversión química en ácido fluorhídrico. La capa de fluoruro de magnesio generada tras este tratamiento mejora el comportamiento del material frente a la corrosión, permitiendo el crecimiento in vitro de células osteoblásticas sobre su superficie y la formación in vivo de una capa de nuevo tejido óseo muy compacta. Estos resultados permiten concluir que el recubrimiento de fluoruro de magnesio es necesario para que el material AZ31 pueda ser potencialmente aplicado como implante biodegradable y reabsorbible en reparaciones óseas. Palabras claveAZ31; Fluoruro de magnesio; Corrosión; Biocompatibilidad; In vitro/in vivo. Corrosion behaviour and in vitro/in vivo biocompatibility of surface-modified AZ31 alloy AbstractThe present work evaluates the corrosion behaviour and the in vitro/in vivo biocompatibility of the AZ31 magnesium alloy, which fulfills the mechanical requirements of bone. The corrosion kinetic of as-received AZ31 alloy was not compatible with the cell growth. To improve its performance, the AZ31 alloy was surface modified by a chemical conversion treatment in hydrofluoric acid. The magnesium fluoride layer generated by the surface treatment of AZ31 alloy enhances its corrosion behaviour, allowing the in vitro growth of osteoblastic cells over the surface and the in vivo formation of a highly compact layer of new bone tissue. These results lead to consider the magnesium fluoride coating as necessary for potential use of the AZ31 alloy as biodegradable and absorbable implant for bone repair. INTRODUCCIÓNLos materiales metálicos, como los aceros inoxidables o el titanio y sus aleaciones, son utilizados habitualmente como implantes temporales de osteosíntesis, en forma de placas y tornillos, debido a su elevada resistencia a la corrosión y adecuada biocompatibilidad en el organismo. No obstante, si estos implantes permanecen en el cuerpo durante un periodo prolongado de tiempo acaban liberando cationes metálicos [1] que pueden ser tóxicos para el organismo, siendo por ello conveniente su retirada en una segunda intervención quirúrgica una vez cumplida su misión de reparación. Este problema puede ser resuelto empleando implantes biodegradables y reabsorbibles, que gradualmente se disuelven y eliminan una vez conseguida la reparación ósea. En este contexto, el magnesio y sus aleaciones pueden ser biomateriales más idóneos que cualesquiera otros implantes, metá-licos o poliméricos, para aplicaciones relacionadas

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“…It is important to bear in mind of the high anticorrosive action of entire coating system and environmental-friendly behavior at the same time 5,[8][9][10] . Furthermore, the corrosion inhibition properties of numerous compounds have been examined through the years in the hope of providing an effective replacement [11][12][13][14][15][16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

et al. 2017

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The corrosion inhibition of nanoparticulates zinc ferrite (NZF) pigment was studied. The steel samples were immersed in the NZF pigment extract in 3.5 wt. % NaCl. Electrochemical tests such as electrochemical impedance spectroscopy (EIS) and polarization as well as surface analysis were employed to evaluate the effect of NZF on the steel corrosion. The concentration of Zn and Fe in the pigment extracts before and after immersion of mild steel samples was evaluated by inductively coupled plasma-optical emission spectrometry (ICP-OES). EIS results in total agreement with results of polarization test demonstrated superiority of NZF as an anticorrosion pigment. In the case of samples exposed to NZF extract, the higher resistance and lower double layer capacitance extracted from impedance spectra as well as lower current density from polarization results might be attributed to precipitation of an inhibitive layer on the surface. This was also supported by SEM/EDS and ICP-OES results.

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Corrosion protection of different environmentally friendly coatings on powder metallurgy magnesium

Cited by 62 publications

References 45 publications

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Characterization of Powder Metallurgy Processed Pure Magnesium Materials for Biomedical Applications

Comportamiento frente a la corrosión y biocompatibilidad <i>in vitro/in vivo</i> de la aleación AZ31 modificada superficialmente

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

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