Cerium-based conversion films developed on LiAl-layered double hydroxide coatings for corrosion protection of AA7075 aluminum alloys
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Published:2022-07-18
Issue:
Volume:
Page:
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ISSN:1847-9286
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Container-title:Journal of Electrochemical Science and Engineering
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language:
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Short-container-title:J. Electrochem. Sci. Eng.
Author:
Petica Aurora,
Manea Adrian Cristian,
Mihai Geanina,
Nicola Ioana,
Ceara Victoria,
Anicai LianaORCID
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.
Publisher
International Association of Physical Chemists (IAPC)
Subject
Electrochemistry,Materials Chemistry,Colloid and Surface Chemistry,Chemical Engineering (miscellaneous)
Cited by
2 articles.
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