We studied the corrosion-protective properties of Cerium oxide coatings chemically deposited in green Ce solution conversion on technically pure aluminium (Al 1050) that were then immersed in phosphate solutions. The effect of: the kind of pretreatment of the l substrate; the conversion treatment of the l substrate in е-containing or P-containing solutions; and the sequential conversion treatment of the l substrate in е-containing and -containing solutions was studied in a comparative study. The results show that pre-treatment of the aluminium substrate and extra phosphate treatment of the Ce-oxide conversion coating placed on Al 1050 have a significant impact on corrosion resistance. The phosphate treatments change the chemical composition, chemical state of the components, structure, and morphology of Ce-oxide coatings produced on Al substrates, according to our findings. Al and Ce phosphates and oxides are generated, forming an efficient barrier to Chloride ion transport towards the metal surface and increasing Al 1050's corrosion resistance (Rp) against general and pitting corrosion. During protracted corrosion experiments, we discovered a significant rise in Rp for one of the model systems (Al(NaOH)/ CCOC(Ce+Cu)/PhL(NH4H2PO4), which was linked to the production of weakly soluble surface corrosion products.
Author (s) DetailsR. Andreeva
Institute of Physical Chemistry ”Acad. R. Kaischew“ – Bulgarian Academy of Sciences, 1113 Sofia, Acad.G.Bonchev str., Bl. 11, Bulgaria.
E. Stoyanova
Institute of Physical Chemistry ”Acad. R. Kaischew“ – Bulgarian Academy of Sciences, 1113 Sofia, Acad.G.Bonchev str., Bl. 11, Bulgaria.
A. Tsanev
Institute of General and Inorganic Chemistry – Bulgarian Academy of Sciences, 1113 Sofia, Acad.G.Bonchev str., Bl. 11, Bulgaria.
D. Stoychev
Institute of Physical Chemistry ”Acad. R. Kaischew“ – Bulgarian Academy of Sciences, 1113 Sofia, Acad.G.Bonchev str., Bl. 11, Bulgaria.
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