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Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075

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2020
10.pdf (2.975Mb)
Autori
Stevanović, Sanja
Lekka, Maria
Lanzutti, Alex
Tasić, Nikola
Živković, Ljiljana S.
Fedrizzi, Lorenzo
Članak u časopisu (Objavljena verzija)
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Authors
Metapodaci
Prikaz svih podataka o dokumentu
Apstrakt
Cerium-based conversion coatings have emerged as promising green alternatives to the harmful chromium-based ones, but the mechanism of corrosive protection still remains a subject of academic and industrial research. This study focuses at small scale phenomena of corrosion inhibition imparted by ceria (CeO2) to AA7075. Ceria nanoparticles were deposited from diluted and concentrated CeO2 sols by immersion. A multi-Analytical approach, combining Atomic Force microscopy (AFM), Scanning Kelvin Probe Force Microscopy, Glow Discharge Optical Emission Spectroscopy, open circuit potential and electrochemical impedance spectroscopy was employed. Deposition of ceria films led to deactivation of cathodic sites, i.e. decreased Volta potential difference, resulting in increased corrosion inhibition. In situ AFM real-Time monitoring revealed that during exposure to NaCl electrolyte, the changes in size of deposited ceria aggregates occurred: nanoparticles disintegrated/desorbed and re-deposited at ...the coating surface. The process was found to be dynamic in nature. Small particles size and inherent reactivity are believed to accelerate this phenomenon. Due to the greater CeO2 reservoir, this phenomenon was more pronounced with a thicker film, imparting longer term protection.

Izvor:
Journal of the Electrochemical Society, 2020, 167, 10, 101503-
Izdavač:
  • The Electrochemical Society
Projekti:
  • Ministarstvo prosvete, nauke i tehnološkog razvoja Republike Srbije, Ugovor br. 451-03-68/2020-14/200135 (Univerzitet u Beogradu, Tehnološko-metalurški fakultet) (RS-200135)
  • Ministarstvo prosvete, nauke i tehnološkog razvoja Republike Srbije, Ugovor br. 451-03-68/2020-14/200017 (Univerzitet u Beogradu, Institut za nuklearne nauke Vinča, Beograd-Vinča) (RS-200017)

DOI: 167

ISSN: 0013-4651

WoS: 000540299100001

Scopus: 2-s2.0-85086519972
[ Google Scholar ]
URI
http://cer.ihtm.bg.ac.rs/handle/123456789/3642
Kolekcije
  • Radovi istraživača / Researchers' publications
Institucija
IHTM
TY  - JOUR
AU  - Stevanović, Sanja
AU  - Lekka, Maria
AU  - Lanzutti, Alex
AU  - Tasić, Nikola
AU  - Živković, Ljiljana S.
AU  - Fedrizzi, Lorenzo
PY  - 2020
UR  - http://cer.ihtm.bg.ac.rs/handle/123456789/3642
AB  - Cerium-based conversion coatings have emerged as promising green alternatives to the harmful chromium-based ones, but the mechanism of corrosive protection still remains a subject of academic and industrial research. This study focuses at small scale phenomena of corrosion inhibition imparted by ceria (CeO2) to AA7075. Ceria nanoparticles were deposited from diluted and concentrated CeO2 sols by immersion. A multi-Analytical approach, combining Atomic Force microscopy (AFM), Scanning Kelvin Probe Force Microscopy, Glow Discharge Optical Emission Spectroscopy, open circuit potential and electrochemical impedance spectroscopy was employed. Deposition of ceria films led to deactivation of cathodic sites, i.e. decreased Volta potential difference, resulting in increased corrosion inhibition. In situ AFM real-Time monitoring revealed that during exposure to NaCl electrolyte, the changes in size of deposited ceria aggregates occurred: nanoparticles disintegrated/desorbed and re-deposited at the coating surface. The process was found to be dynamic in nature. Small particles size and inherent reactivity are believed to accelerate this phenomenon. Due to the greater CeO2 reservoir, this phenomenon was more pronounced with a thicker film, imparting longer term protection.
PB  - The Electrochemical Society
T2  - Journal of the Electrochemical Society
T1  - Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075
VL  - 167
IS  - 10
SP  - 101503
DO  - 167
ER  - 
@article{
author = "Stevanović, Sanja and Lekka, Maria and Lanzutti, Alex and Tasić, Nikola and Živković, Ljiljana S. and Fedrizzi, Lorenzo",
year = "2020",
url = "http://cer.ihtm.bg.ac.rs/handle/123456789/3642",
abstract = "Cerium-based conversion coatings have emerged as promising green alternatives to the harmful chromium-based ones, but the mechanism of corrosive protection still remains a subject of academic and industrial research. This study focuses at small scale phenomena of corrosion inhibition imparted by ceria (CeO2) to AA7075. Ceria nanoparticles were deposited from diluted and concentrated CeO2 sols by immersion. A multi-Analytical approach, combining Atomic Force microscopy (AFM), Scanning Kelvin Probe Force Microscopy, Glow Discharge Optical Emission Spectroscopy, open circuit potential and electrochemical impedance spectroscopy was employed. Deposition of ceria films led to deactivation of cathodic sites, i.e. decreased Volta potential difference, resulting in increased corrosion inhibition. In situ AFM real-Time monitoring revealed that during exposure to NaCl electrolyte, the changes in size of deposited ceria aggregates occurred: nanoparticles disintegrated/desorbed and re-deposited at the coating surface. The process was found to be dynamic in nature. Small particles size and inherent reactivity are believed to accelerate this phenomenon. Due to the greater CeO2 reservoir, this phenomenon was more pronounced with a thicker film, imparting longer term protection.",
publisher = "The Electrochemical Society",
journal = "Journal of the Electrochemical Society",
title = "Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075",
volume = "167",
number = "10",
pages = "101503",
doi = "167"
}
Stevanović S, Lekka M, Lanzutti A, Tasić N, Živković LS, Fedrizzi L. Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075. Journal of the Electrochemical Society. 2020;167(10):101503
Stevanović, S., Lekka, M., Lanzutti, A., Tasić, N., Živković, L. S.,& Fedrizzi, L. (2020). Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075.
Journal of the Electrochemical SocietyThe Electrochemical Society., 167(10), 101503.
https://doi.org/167
Stevanović Sanja, Lekka Maria, Lanzutti Alex, Tasić Nikola, Živković Ljiljana S., Fedrizzi Lorenzo, "Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075" 167, no. 10 (2020):101503,
https://doi.org/167 .

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