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

Aurora Petica; Adrian Cristian Manea; Geanina Mihai; Ioana Nicola; Victoria Ceara; Liana Anicai

doi:10.5599/jese.1305

Authors

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

DOI:

https://doi.org/10.5599/jese.1305

Keywords:

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

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 132^o 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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