Effect of ZrO2 and L-Cys nanoparticles as dopants in sol-gel of mesoporous silica coating for corrosion protection of AZ61 magnesium alloy

  1. Hernández, Leonardo 1
  2. Veleva, Lucien 1
  3. García-Galván, Federico R. 2
  4. Galván, Juan Carlos 2
  1. 1 Center for Investigation and Advanced Study (CINVESTAV-IPN), Applied Physics Department
  2. 2 Centro Nacional de Investigaciones Metalúrgicas (CENIM, CSIC)
Revista:
Revista de metalurgia

ISSN: 0034-8570

Año de publicación: 2019

Volumen: 55

Número: 4

Páginas: 155

Tipo: Artículo

DOI: 10.3989/REVMETALM.155 DIALNET GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: Revista de metalurgia

Resumen

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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Información de financiación

L. Hern?ndez gratefully thanks CONACYT for his scholarship as Ph.D. student at CINVESTAV-IPN and for the research stay at CENIM/CSIC (the National Center for metallurgical Research of Madrid, Spain). The authors acknowledge LANNBIO-CINVESTAV for permitting the use of their facilities, as well to D. Aguilar-Trevi?o, D. Huerta-Quintanilla, and G. Espinoza-Gurriz for their technical assistance.

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