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Improving the Corrosion Resistance of Anodized Al 1050 Alloy by Sealing in Cerium-Containing and Mixed Sodium Phosphate Mono Basic and Calcium Nitrate Solutions
by
Reni Andreeva
Reni Andreeva
Dr. Reni Alipieva Andreeva completed her
master's degree at the University of Chemical Technology [...]
Dr. Reni Alipieva Andreeva completed her
master's degree at the University of Chemical Technology and Metallurgy,
Sofia, with the specialty “Electrochemistry and corrosion protection”. She
received her PhD degree in 2019 at the Institute of Physical Chemistry—
Bulgarian Academy of Sciences. She is currently working at the Institute of Physical Chemistry "Rostislaw
Kaischew"—Bulgarian Academy of Sciences. Her scientific research interests are focused mainly on establishing
options for the
selection of suitable
compositions and
regimes for electrochemical and chemical deposition of oxide layers of metals of the lanthanides group on aluminum and on its alloys, aiming at improving their corrosion
behavior in aggressive chlorine ions containing corrosion medium.
,
Aleksandar Tsanev
Aleksandar Tsanev
Dr. Aleksandar Tsanev
completed his master's degree
at Sofia University St. Kliment Ohridsky, His [...]
Dr. Aleksandar Tsanev
completed his master's degree
at Sofia University St. Kliment Ohridsky, Chemical
department. His specialty is in Inorganic and Analytical Chemistry. He
finished his PhD thesis at the Institute of General and Inorganic Chemistry,
Bulgarian Academy of Sciences, in 2017, with a specialty in Solid-State
Chemistry. His scope of interest is electrochemistry and catalysis. Now, Dr.
Aleksandar Tsanev works with X-ray electron spectroscopy.
Dimitar Stoychev
Dimitar Stoychev
Dr. Dimitar Stoychev is a Professor at the Institute of Physical Chemistry—Bulgarian Academy of He [...]
Dr. Dimitar Stoychev is a Professor at the Institute of Physical Chemistry—Bulgarian Academy of Sciences. He graduated from
the St. Petersburg Institute of Technology (Russia) in 1969, receiving a diploma
in electrochemical engineering (MS degree). In the same year, he joined the Institute of Physical
Chemistry at the Bulgarian Academy of Sciences in Sofia. He obtained his Ph.D. degree in 1980 from IPC BAS.
In 2000, he received his D.Sc. degree from IPC-BAS on the basis of his doctoral
dissertation entitled “Immersion Treatment of Aluminum and Electrodeposition of
Copper Coatings with Definite Properties”. The research interests of D. Stoychev
include the electrodeposition (initial and advanced stages of
electrocrystallization) of metals and oxide layers, their structure and
physico-mechanical properties, corrosion resistance, methods for chemical and
electrochemical passivation, and protection of metal surfaces using
environment-friendly chemical solutions, protective/decorative, and functional
composite coatings. He has authored and coauthored more than 200 scientific
papers and reports, and he is the holder of 29 patents.
1
“Rostislaw Kaischew” Institute of Physical Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Street, bl. 11, 1113 Sofia, Bulgaria
2
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, “Acad. G. Bonchev” Street, bl. 11, 1113 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Metals 2024, 14(7), 768; https://doi.org/10.3390/met14070768 (registering DOI)
Submission received: 14 May 2024
/
Revised: 24 June 2024
/
Accepted: 25 June 2024
/
Published: 28 June 2024
Abstract
This investigation presents results on the improvement of the corrosion-protective effect of consecutive sealing treatments of anodized Al 1050 (AlAnod). The treatments were performed in cerium-containing and mixed NaH2PO4 + Ca(NO3)2 solutions. The changes of the surface morphology, structure and chemical composition, chemical state of the elements, and basic corrosion parameters of the studied systems were investigated by SEM, EDXS, XRD, XPS, and a complex of electrochemical techniques (PDP, EOCP vs. timeplot, chronoamperometric transients, Rp and CR at ЕOCP, etc.). The results obtained show that the basic components of the obtained sealing conversion layers (before and after exposure to model Cl−-containing corrosion media) are characterized by Ca10(PO4)6(OH)2, AlO(OH), CePO4, and CeAlO3 (after the corrosion tests, they are converted to insoluble Me-PO3 and Me-P4O10). We conclude that the observed decrease in the corrosion rate of Al and the corresponding increase in the polarization resistance are accomplished by the two-step sealing treatment, which fills up the AlAnod pores with insoluble deposits.
Share and Cite
MDPI and ACS Style
Andreeva, R.; Tsanev, A.; Stoychev, D.
Improving the Corrosion Resistance of Anodized Al 1050 Alloy by Sealing in Cerium-Containing and Mixed Sodium Phosphate Mono Basic and Calcium Nitrate Solutions. Metals 2024, 14, 768.
https://doi.org/10.3390/met14070768
AMA Style
Andreeva R, Tsanev A, Stoychev D.
Improving the Corrosion Resistance of Anodized Al 1050 Alloy by Sealing in Cerium-Containing and Mixed Sodium Phosphate Mono Basic and Calcium Nitrate Solutions. Metals. 2024; 14(7):768.
https://doi.org/10.3390/met14070768
Chicago/Turabian Style
Andreeva, Reni, Aleksandar Tsanev, and Dimitar Stoychev.
2024. "Improving the Corrosion Resistance of Anodized Al 1050 Alloy by Sealing in Cerium-Containing and Mixed Sodium Phosphate Mono Basic and Calcium Nitrate Solutions" Metals 14, no. 7: 768.
https://doi.org/10.3390/met14070768
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