Phosphate sealing improvement of the corrosion resistance of thin cerium oxides coatings electroless deposited on aluminium

The corrosion-protective ability was investigated of electroless deposited ceria conversion coatings on substrate(s) of technically pure aluminium. By applying different electrochemical methods, a comparative study of the investigated samples was conducted regarding the effect of pre-treatment of th...

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Bibliographic Details
Published in:Journal of physics. Conference series 2022-03, Vol.2240 (1), p.12001
Main Authors: Andreeva, R, Stoychev, D
Format: Article
Language:English
Subjects:
aluminium
Aluminum
ceria and phosphate(s) conversion coatings
Cerium oxides
Comparative studies
Conversion coatings
Corrosion
Corrosion resistance
Electroless plating
Physics
Pitting (corrosion)
Protective coatings
Stoichiometry
Substrates
Surface layers
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Summary:The corrosion-protective ability was investigated of electroless deposited ceria conversion coatings on substrate(s) of technically pure aluminium. By applying different electrochemical methods, a comparative study of the investigated samples was conducted regarding the effect of pre-treatment of the Al substrate and the type of phosphate post-treatment on the change of: E OCP values, monitored E OCP vs. time plot; course of i a transients at the E pit of Al, i.e., i a vs. time plot; Rp vs. time of exposure of the samples in a corrosion medium and connected with this change in the CR of the systems studied. The juxtaposition of the obtained results showed the order of stabilities of the investigated systems towards the appearance and development of pitting corrosion. The presented results can be connected with and explain the data obtained earlier about the calculated stoichiometry of the elements in the so-formed compounds in the surface layers ascertaining that they are built of phosphate and oxide compounds of Ce 3+ , Ce 4+ and Al 3+ , as well as with the influence of the concentrations of Cu and Fe around them.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2240/1/012001