Cerium-based conversion films developed on LiAl-layered double hydroxide coatings for corrosion protection of AA7075 aluminum alloys

Original scientific paper


  • Aurora Petica Center of Surface Science and Nanotechnology, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
  • Adrian Cristian Manea Center of Surface Science and Nanotechnology, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
  • Geanina Mihai Center of Surface Science and Nanotechnology, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
  • Ioana Nicola ICPE-SA, Splaiul Unirii 313, 030138, Bucharest, Romania
  • Victoria Ceara ICPE-SA, Splaiul Unirii 313, 030138, Bucharest, Romania
  • Liana Anicai Center of Surface Science and Nanotechnology, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania https://orcid.org/0000-0002-1145-2948




Conversion coatings, chromium-free conversion coatings, aluminum alloys, corrosion behavior;, hydrophobic layers
Graphical Abstract


The paper presents several experimental results regarding the influence of various procedures applied to incorporate Ce species in hydrotalcite–type chemical conver­sion coatings on the overall corrosion performance for AA 7075 aluminum alloy as a metallic substrate. Two routes were envisaged: (i) chemical incorporation of Ce by immersion in cerium nitrate solutions and (ii) electrochemical deposition of hydro­phobic Ce - based layer involving ethanolic solutions of stearic acid and cerium nitrate. The chemical route involving immersion in cerium nitrate solutions led to the incorpo­ration of 2.46 – 6.84 wt.% Ce in the composition of the porous conversion layer. The electrochemical process facilitated the formation of a hydrophobic cerium stearate layer on porous hydrotalcite conversion coating showing water contact angles of about 132o and a higher Ce content incorporated of 6.55 – 9.73 wt.%. The corrosion performance of the Ce-based conversion coatings is also discussed.


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How to Cite

Petica, A., Manea, A. C., Mihai, G., Nicola, I., Ceara, V., & Anicai, L. (2022). Cerium-based conversion films developed on LiAl-layered double hydroxide coatings for corrosion protection of AA7075 aluminum alloys: Original scientific paper. Journal of Electrochemical Science and Engineering, 12(4), 703–719. https://doi.org/10.5599/jese.1305



Electrodeposition and coatings