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

2020
Authors
Stevanović, Sanja I.Lekka, Maria
Lanzutti, Alex
Tasić, Nikola

Živković, Ljiljana S.

Fedrizzi, Lorenzo
Bajat, Jelena B.

Article (Published version)
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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.
Source:
Journal of the Electrochemical Society, 2020, 167, 10Publisher:
- Electrochemical Soc Inc, Pennington
Funding / projects:
- COST ActionEuropean Cooperation in Science and Technology (COST) [MP1407]
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200135 (University of Belgrade, Faculty of Technology and Metallurgy) (RS-200135)
- Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200017 (University of Belgrade, Institute of Nuclear Sciences 'Vinča', Belgrade-Vinča) (RS-200017)
DOI: 10.1149/1945-7111/ab98af
ISSN: 0013-4651
WoS: 000540299100001
Scopus: 2-s2.0-85086519972
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Institution/Community
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Stevanović, Sanja I. AU - Lekka, Maria AU - Lanzutti, Alex AU - Tasić, Nikola AU - Živković, Ljiljana S. AU - Fedrizzi, Lorenzo AU - Bajat, Jelena B. PY - 2020 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/1377 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 - Electrochemical Soc Inc, Pennington T2 - Journal of the Electrochemical Society T1 - Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075 IS - 10 VL - 167 DO - 10.1149/1945-7111/ab98af ER -
@article{ author = "Stevanović, Sanja I. and Lekka, Maria and Lanzutti, Alex and Tasić, Nikola and Živković, Ljiljana S. and Fedrizzi, Lorenzo and Bajat, Jelena B.", year = "2020", 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 = "Electrochemical Soc Inc, Pennington", journal = "Journal of the Electrochemical Society", title = "Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075", number = "10", volume = "167", doi = "10.1149/1945-7111/ab98af" }
Stevanović, S. I., Lekka, M., Lanzutti, A., Tasić, N., Živković, L. S., Fedrizzi, L.,& Bajat, J. B.. (2020). Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075. in Journal of the Electrochemical Society Electrochemical Soc Inc, Pennington., 167(10). https://doi.org/10.1149/1945-7111/ab98af
Stevanović SI, Lekka M, Lanzutti A, Tasić N, Živković LS, Fedrizzi L, Bajat JB. Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075. in Journal of the Electrochemical Society. 2020;167(10). doi:10.1149/1945-7111/ab98af .
Stevanović, Sanja I., Lekka, Maria, Lanzutti, Alex, Tasić, Nikola, Živković, Ljiljana S., Fedrizzi, Lorenzo, Bajat, Jelena B., "Real-Time AFM and Impedance Corrosion Monitoring of Environmentally Friendly Ceria Films on AA7075" in Journal of the Electrochemical Society, 167, no. 10 (2020), https://doi.org/10.1149/1945-7111/ab98af . .