Caracterización y comportamiento frente a la corrosión de recubrimientos de ácido fítico, obtenidos por conversión química, sobre substratos de magnesio en solución fisiológica

Hernández-Alvarado, L.A.; Lomeli, Martha Alejandra; Miranda, J. M.; Narváez, L.; Díaz, Iván; García‐Alonso, M. C.; Escudero, M.L.

doi:10.3989/revmetalm.012

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…2, the characteristic peaks at 1061cm − 1 , 1128cm − 1 and 3452 cm − 1 are ascribed to stretching vibration absorption of PO 4 3− , P = O and -OH in PA case, respectively. [34] In EGDE case, the absorption peaks at 912cm − 1 and 876cm − 1 are ascribed to the stretching vibration of epoxy groups. The broad absorption peak around 3472cm − 1 is attributed to the stretching vibration of -OH.…”

Section: Characterization Of Pa-egde and Pa-egde/ep Coatingsmentioning

confidence: 98%

Preparation and study of modified phytic acid/epoxy resin anti-corrosion coating

Ju,

Wang,

et al. 2023

Colloid Polym Sci

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The anti-corrosion epoxy-based coating is crucial for industrial development. Improvement of the anticorrosion of epoxy-based coatings through a simple, effective and eco-friendly way is of great signi cance. Phytic acid (PA) is a kind of natural and eco-friendly corrosion inhibitor, however, the compatibility problem between PA and epoxy resin (EP) is not good. This problem is addressed by the modi cation of PA in this paper. PA is grafted to ethylene glycol diglycidyl ether (EGDE) to obtain modi ed PA (PA-EGDE) by the catalysis of tetrabutylammonium bromide under mild conditions. Subsequently, PA-EGDE is added to EP to prepare PA-EGDE/EP coatings. When the PA-EGDE loading is 5 wt%, the PA-EGDE/EP coating exhibits excellent mechanical and anti-corrosion properties. The hardness, exibility and shock resistance are 2H, 1mm and 50cm, respectively, which are as good as those of pure EP coating. The E corr value of PA-EGDE/EP coating at 5 wt% PA-EGDE loading is -0.620 eV, which is much higher than that of EP coating (-0.797 eV); the impedance modulus is 10 8 Ω•cm 2 after immersion in 3.5 wt% NaCl aqueous solution for 30 days, which is much bigger than that of EP coating (10 6 Ω•cm 2 ).Otherwise, the anti-corrosion mechanism of PA in EP coating is thoroughly discussed.

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Section: Characterization Of Pa-egde and Pa-egde/ep Coatingsmentioning

confidence: 98%

Preparation and study of modified phytic acid/epoxy resin anti-corrosion coating

Ju,

Wang,

et al. 2023

Colloid Polym Sci

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“…Figure 2(b) shows the cross-section of the PA coating, which exhibits a compact and continuous morphology; however, some cracks and elongated cavities connected to the substrate are present in the lower layer. The related XRD and FTIR data have been previously published in the literature [64,71].…”

Section: Surface and Coating Characterisationmentioning

confidence: 99%

“…Phytate ions have a negative charge and low density that promote their chemical interactions with numerous metallic cations, forming stable chelate deposits on the metal surface and a stable chemical conversion layer, thereby increasing the corrosion resistance. Although PA coatings on Mgbased substrates demonstrated a high potential for medical applications [61][62][63], such conversion coatings often consist of two layers: a compact inner layer and an outer layer with a network of fine microcracks [38,39,41,[64][65][66][67], which may accelerate the corrosion of Mg-based substrates due to the electrolyte permeation into the coating/substrate interface [15,41]. The density of microcracks increases with increasing PA coating thickness [39].…”

Section: Introductionmentioning

confidence: 99%

Corrosion rates of reabsorbable Mg-based materials coated with phytic acid

Hernández-Alvarado

Lomeli

Miranda

et al. 2021

Corrosion Engineering, Science and Technology

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The development of temporary protective coatings on magnesium implants is a priority in the biomedical field. In the present study, corrosion rates were determined by various techniques for powder metallurgy Mg and AZ31 magnesium alloy uncoated and coated with phytic acid (PA). Weight loss measurements, potentiodynamic polarisation, and electrochemical impedance spectroscopy were performed to monitor the corrosion evolution in a phosphate-buffered saline solution at 37°C. The corrosion rates of all samples determined from weight losses were higher than those obtained by electrochemical techniques. According to electrochemical data, the initial corrosion current density of the coated samples decreased by three orders of magnitude as compared with that of the bare substrates. However, the protective effect weakened with the testing time due to the presence of microcracks in the PA conversion coating, which indicated the potential applicability of the coated AZ31 alloy as a biodegradable and resorbable temporary implant material for bone repair.

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“…In this case, the adhesion between the Mg and the polymer plays an important role in the useful life of the coating, which depends on its stability when loaded with drug nanoparticles (Park et al, 2013). Several application techniques for thin film coating formation on metal surfaces have been used: for example, plasma deposition (Luo and Cui, 1998), chemical conversion (Hernández-Alvarado et al, 2014) and the sol-gel method (Tan et al, 2005;Supplit et al, 2007;Zhong et al, 2008;Minti et al, 1991), among others.…”

Section: Introductionmentioning

confidence: 99%

Efecto de las nanopartículas de ZrO<sub>2</sub> y L-Cys como agentes dopantes de recubrimientos sol-gel de sílice mesoporosa para la protección anticorrosiva de la aleación de magnesio AZ61

et al. 2019

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Sobre la superficie de la aleación de magnesio AZ61 se aplicaron recubrimientos de sol-gel basados en el precursor GPTMS-TMOS, incluyendo como agentes dopantes L-Cysteína y ZrO2 en diferentes concentraciones. Su resistencia a la corrosión se estudió en solución de 0,6M NaCl, por inmersión hasta 14 días. Los patrones de DRX revelaron que el principal producto de corrosión en las superficies recubiertas es Mg(OH)2, mientras que en la de AZ61 no tratada adicionalmente se formaron varios compuestos de Zn con cloro. El ataque de la corrosión localizada en el AZ61 no tratada se manifiesta en forma de grietas y cavernas, mientras que en las superficies recubiertas la corrosión fue principalmente a través de picaduras. Dos métodos electroquímicos no destructivos fueron empleados en este estudio, que contrastan el comportamiento electroquímico del AZ61 recubierto con el de la aleación no recubierta. La tendencia en los cambios del potencial de corrosión en circuito abierto se correlacionó positivamente con el análisis SEM-EDS y DRX. Los diagramas EIS se ajustaron satisfactoriamente al modelo de circuito equivalente y los valores obtenidos de resistencia a la corrosión Rcorr (Rs + Rct) disminuyen drásticamente con el tiempo de exposición. El efecto de ZrO2 y L-cisteína están marcadamente influenciados por los cambios del pH de la solución, el potencial Zeta de la carga superficial, los procesos de quimisorción y desorción, el estrés interno en el precursor sol-gel, así como el cambio en su estructura, después de la encapsulación de ambos dopantes.

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Caracterización y comportamiento frente a la corrosión de recubrimientos de ácido fítico, obtenidos por conversión química, sobre substratos de magnesio en solución fisiológica

Cited by 5 publications

References 24 publications

Preparation and study of modified phytic acid/epoxy resin anti-corrosion coating

Preparation and study of modified phytic acid/epoxy resin anti-corrosion coating

Corrosion rates of reabsorbable Mg-based materials coated with phytic acid

Efecto de las nanopartículas de ZrO<sub>2</sub> y L-Cys como agentes dopantes de recubrimientos sol-gel de sílice mesoporosa para la protección anticorrosiva de la aleación de magnesio AZ61

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