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)
Zeitschrift:
Revista de metalurgia

ISSN: 0034-8570

Datum der Publikation: 2019

Ausgabe: 55

Nummer: 4

Seiten: 155

Art: Artikel

DOI: 10.3989/REVMETALM.155 DIALNET GOOGLE SCHOLAR lock_openOpen Access editor

Andere Publikationen in: Revista de metalurgia

Zusammenfassung

Sol-gel coatings based on GPTMS-TMOS precursor, including as dopants L-Cysteine and ZrO2 in different concentrations, were applied on the surface of AZ61 magnesium alloy. Their corrosion resistance was studied in 0.6M NaCl solution, by immersion up to 14 days. XRD spectra revealed Mg(OH)2 as the main corrosion product on the coated surface, while on the untreated AZ61 in addition there were several compounds of Zn with chloride. The localized corrosion attack on the untreated AZ61 was expressed by cracks and caverns, while on the dip-coated surface the corrosion was mostly through pitting. Two non-destructive electrochemical methods were employed, contrasting the electrochemical behavior of coated AZ61 with that of uncoated alloy. The tendency in the changes of the corrosion potential at open circuit correlated positively with SEM-EDS and XRD analysis. The EIS diagrams were fitted to equivalent-circuit model and the obtained corrosion resistance Rcorr (Rs + Rct) values strongly decreased over time. The ZrO2 and L-Cysteine effect is influenced by the pH changes of the solution, Zeta potential surface charge, chemisorption and desorption processes, internal stress in the sol-gel precursor, as well as the change in its structure, after the encapsulation of both dopants.

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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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