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Influence of buffering on the spontaneous deposition of cerium conversion coatings for corrosion protection of AA2024-T3 aluminum alloy

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Abstract

Cerium-based conversion coatings were spontaneously deposited on AA2024-T3 alloy at 60 °C using buffered and non-buffered CeCl3 solutions in the presence of H2O2. Malonic acid or amino-acetic acid (glycine) was used as buffering additives. The deposition process and the properties of the coatings obtained were followed by linear voltammetry and electrochemical impedance spectroscopy. The surface morphology was studied by scanning electron microscopy. It was found that buffering complicates the conversion process and hampers the deposition rate. The coatings deposited using buffered baths had lower barrier ability and corrosion durability in 3.5 % NaCl corrosive medium compared to those deposited in the absence of buffers.

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Acknowledgments

The authors gratefully acknowledge the financial support of project BG 051PO001-3.3.06-0038. We are thankful to Assoc. Prof. Dr. Eng. I. Nenov for the valuable information provided and for his assistance with the data interpretation. Dr. Gustavo Pelaez Lourido is acknowledged for the opportunity for international collaboration activities.

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Authors and Affiliations

  1. University of Chemical Technology and Metallurgy, 8 “Kl. Okhridsky” blvd., 1756, Sofia, Bulgaria

    Stephan V. Kozhukharov, Maria. S. Machkova & Vladimir S. Kozhukharov

  2. University of Vigo, Lagoas, Marcosende, 36310, Vigo, Spain

    Olaia F. Acuña

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  1. Stephan V. Kozhukharov
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  2. Olaia F. Acuña
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  3. Maria. S. Machkova
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  4. Vladimir S. Kozhukharov
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Correspondence to Stephan V. Kozhukharov.

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Kozhukharov, S.V., Acuña, O.F., Machkova, M.S. et al. Influence of buffering on the spontaneous deposition of cerium conversion coatings for corrosion protection of AA2024-T3 aluminum alloy. J Appl Electrochem 44, 1093–1105 (2014). https://doi.org/10.1007/s10800-014-0718-7

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